@article{nokey,

title = {アミノ酸のペンタフルオロベンジル誘導体のGC/EI-MSによる解析},

author = {田中, 杏奈 and 落合, 陽香 and *熊田, 英峰 and 梅村, 知也},

doi = {10.2116/bunsekikagaku.72.407},

year  = {2023},

date = {2023-07-06},

urldate = {2023-07-06},

journal = {分析化学},

volume = {72},

number = {10-11},

pages = {407-416},

abstract = {The determination of amino acids by gas chromatography-mass spectrometry (GC-MS) using a one-step derivatization with pentafluorobenzyl bromide (PFB-Br) in an aqueous acetone phase is described. Although GC-MS analysis of amino acids by pentafluorobenzyl (PFB) derivatization has been reported previously, its application to non-proteinogenic free amino acids, which play important biological roles in various metabolic pathways, has not been reported. In this study, 6 non-proteinogenic amino acids (sarcosine, 2-aminobutyric acid, 3-aminoisobutyric acid, beta-alanine, 2-aminoadipic acid, and cystine) as well as 19 proteinogenic amino acids, with the exception of arginine, were PFB derivatized and analyzed by GC-MS using both electron ionization (EI) and positive-ion chemical ionization (PICI) modes. Two derivative peaks were observed for each amino acid with primary amino groups, which were identified as di- and/or tri-substituted derivatives (i.e., NH(PFB)-CHR-COO(PFB) or N(PFB)2-CHR-COO(PFB)) based on their EI- and PICI-mass spectra. The ratio of the tri-substituted to the sum of the di- and tri-substituted derivative peaks was highest in glycine and beta-alanine and lowest in branched amino acids, suggesting a dependence on steric hindrance around amino groups. Based on the identification of PFB derivative peaks, their retention indices on (5%-phenyl)-methylpolysiloxane liquid phase capillary column, target and qualifier ions for selected ion monitoring (SIM) analysis on GC-EI-MS were determined to compile a quantification database. },

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{nokey,

title = {多環芳香族炭化水素による汚染の変遷},

author = {熊田, 英峰},

editor = {吉永, 淳},

issn = {0018-3342/23},

year  = {2023},

date = {2023-06-01},

urldate = {2023-06-01},

journal = {保健の科学},

volume = {65},

issue = {6},

pages = {387-393},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{nokey,

title = {Source apportionment of black carbon aerosols by isotopes (14C and 13C) and Bayesian modeling from two remote islands in east Asian outflow region},

author = {Masao Uchida and Kanako Mantoku and Hidetoshi Kumata and Naoki Kaneyasu and Daishi Handa and

Takemitsu Arakaki and Toshiyuki Kobayashi and Shiro Hatakeyama and Yasuyuki Shibata and Kimitaka Kawamura},

doi = {10.1016/j.nimb.2023.02.002},

year  = {2023},

date = {2023-02-02},

urldate = {2023-02-02},

journal = {Nuclear Instruments and methods in physical research B},

volume = {538},

pages = {64-74},

abstract = {We report the results of source apportionment of combustion-derived black carbon (BC), in PM2.5 aerosols collected from the East Asian continental outflow region at two islands; Okinawa and Fukue during the period from October 2009 to May 2010. The 14C contents of BC from Okinawa (Cape Hedo) and Fukue islands (Fukue) varied from 24.4 to 34.2 pMC and from 18.1 to 43.0 pMC, respectively. Source apportionment of BC was conducted by using a simple 14C mass balance model and a dual-isotope Bayesian Markov chain Monte Carlo model. Biomass combustion contributions (e.g., wood fuel and crop residues) were 23-31 % (mean 27 ± 3 %) at Cape Hedo and 15-38 % (mean 27 ± 12 %) at Fukue. Both sites were equally affected by biomass combustion, whose levels are similar to those observed in the hotspot regions (megacities) in China. Fossil fuel contributions (e.g., oil, gasoline, and diesel) were 69-77 % (mean 74 ± 3 %) with 2-69 % from coal and 3-76 % from liquid fossil at Cape Hedo, and 55-85 % (mean 73 ± 12 %) at Fukue with 3 % from coal and 53-56 % from liquid fuel for the early winter. Those variations for both sites showed significantly different source region-specific trends and this trend was also consistent with the results of the airmass trajectory analysis with a higher contribution of coal-BC from North China including Beijing, and East China including Shanghai. In spring, we found a higher contribution of liquid fossil fuel combustion (e.g., traffic) over the East China Sea, including Pacific air masses, suggesting that the possible contribution of ship emissions was relatively high. Although our results for isotopes-based source apportionment of BC are preliminary, these findings suggest that long-term monitoring of BC aerosols, even in remote sites of Asian outflows, and source-specific descriptions of BC are important to improve climate models. We also recommend further measurements for implementing regionally tailored mitigation.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Wakana2021,

title = {The ER cholesterol sensor SCAP promotes carts biogenesis at ER–golgi membrane contact sites},

author = {Yuichi Wakana and Kaito Hayashi and Takumi Nemoto and Chiaki Watanabe and Masato Taoka and Jessica Angulo-Capel and Maria F. Garcia-Parajo and Hidetoshi Kumata and Tomonari Umemura and Hiroki Inoue and Kohei Arasaki and Felix Campelo and Mitsuo Tagaya},

url = {https://rupress.org/jcb/article/220/1/e202002150/211521/The-ER-cholesterol-sensor-SCAP-promotes-CARTS},

doi = {10.1083/jcb.202002150},

issn = {15408140},

year  = {2021},

date = {2021-01-01},

urldate = {2021-01-01},

journal = {Journal of Cell Biology},

volume = {220},

issue = {1},

pages = {e202002150},

publisher = {Rockefeller University Press},

abstract = {In response to cholesterol deprivation, SCAP escorts SREBP transcription factors from the endoplasmic reticulum to the Golgi complex for their proteolytic activation, leading to gene expression for cholesterol synthesis and uptake. Here, we show that in cholesterol-fed cells, ER-localized SCAP interacts through Sac1 phosphatidylinositol 4-phosphate (PI4P) phosphatase with a VAP–OSBP complex, which mediates counter-transport of ER cholesterol and Golgi PI4P at ER–Golgi membrane contact sites (MCSs). SCAP knockdown inhibited the turnover of PI4P, perhaps due to a cholesterol transport defect, and altered the subcellular distribution of the VAP–OSBP complex. As in the case of perturbation of lipid transfer complexes at ER–Golgi MCSs, SCAP knockdown inhibited the biogenesis of the trans-Golgi network–derived transport carriers CARTS, which was reversed by expression of wild-type SCAP or a Golgi transport–defective mutant, but not of cholesterol sensing–defective mutants. Altogether, our findings reveal a new role for SCAP under cholesterol-fed conditions in the facilitation of CARTS biogenesis via ER–Golgi MCSs, depending on the ER cholesterol.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Fujimori2021,

title = {Investigation of Adverse Effect of Coexisting EDTA during Chelating-resin Solid Phase Extraction on the Determination of Trace Elements in Environmental Water Samples by ICP-MS},

author = {Eiji Fujimori and Hidetoshi Kumata and Tomonari Umemura},

doi = {10.2116/BUNSEKIKAGAKU.70.31},

issn = {0525-1931},

year  = {2021},

date = {2021-01-01},

journal = {BUNSEKI KAGAKU},

volume = {70},

issue = {1.2},

pages = {31-37},

publisher = {The Japan Society for Analytical Chemistry},

abstract = {When chelating-resin solid phase extraction (SPE) was used for the preconcentration of trace elements in environmental water samples around sewage treatment plants (STP), low recovery values for several elements were observed. In the present work, the adverse effect of coexisting EDTA on the recovery of various elements during the SPE procedure was investigated in detail. It was found that EDTA was contained in the environmental water at several hundred nmol L–1 level, and interfered with the adsorption of trace elements, especially Fe, Cu and heavy rare earth elements on the chelating-resin due to the formation of stable complexes. Therefore, an acid treatment was applied to decompose EDTA molecules. As a result of the acid treatment with HNO3 and H2O2 at 200 °C for 4 h, almost all of the elements were quantitatively recovered from the environmental water by chelating-resin SPE with good reproducibility. The feasibility of the present method was examined by analyzing a river water certified reference material (JSAC 0302-3c). The present method was applicable for the determination of trace elements including rare earth elements in an environmental water sample around STP with good precision.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{nokey,

title = {タイヤ摩耗粒子マーカーを用いた道路面発生粒子状物質の水環境への影響評価},

author = {Hidetoshi Kumata},

issn = {09168958},

year  = {2020},

date = {2020-09-01},

journal = {水環境学会誌},

volume = {43},

issue = {9},

pages = {298-302},

note = {Molecular Markers of Tire Wear Partilces for Assessing the Relative Impact of Particulate Emissions from Road Surfaces to the Aquatic Environment. *KUMATA, Hidetoshi, Journal of Japan Society on Water Environment},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Imazaki2020,

title = {Preparation of horizontal miniature TLC developing chamber for ultra-thin layer chromatography},

author = {R. Imazaki and K. Kondoh and N. Tani and M. Aoki and H. Kumata and T. Uchida and T. Naganawa and T. Shimada and Y. Taguchi and H. Sato and T. Yasui and T. Umemura},

doi = {10.2116/bunsekikagaku.69.553},

issn = {05251931},

year  = {2020},

date = {2020-01-01},

urldate = {2020-01-01},

journal = {Bunseki Kagaku},

volume = {69},

issue = {10.11},

abstract = {© 2020 The Japan Society for Analytical Chemistry. This paper describes a horizontal miniature developing chamber suitable for ultrathin layer chromatography (UTLC) and TLC-MS. The miniature developing chamber was designed by a CAD system and cut out from a PTFE block with a milling machine. The basic performance of the laboratory-made chambers was evaluated through TLC separations of lipids extracted from cyanobacteria on a commercially available silica gel 60-coated glass plate. The present miniature TLC chamber showed good performance comparable to a commercially available normal-size twin-trough vertical TLC chamber. In the present paper, ultra-thin layer plate was also prepared by decorating ZnO nanowires on a glass slide, and was applied to UTLC separation of synthetic pigments. The ZnO nanowire-array plate showed unique retention characteristics which allowed us to separate nile red and neutral red in the miniature TLC chamber.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Endo2020,

title = {Reduced bioavailability of polycyclic aromatic hydrocarbons (PAHs) in sediments impacted by carbon manufacturing plant effluent: Evaluation by ex situ passive sampling method},

author = {S. Endo and M. Yoshimura and H. Kumata and M. Uchida and Y. Yabuki and H. Nakata},

doi = {10.1016/j.envpol.2019.113448},

issn = {18736424},

year  = {2020},

date = {2020-01-01},

urldate = {2020-01-01},

journal = {Environmental Pollution},

volume = {256},

pages = {113448},

abstract = {© 2019 Elsevier Ltd Potential risks of polycyclic aromatic hydrocarbons (PAHs) in sediments of a Japanese bay contaminated by carbon manufacturing plant effluent were evaluated by calculating toxicity units (TUs). TUs calculated from the measured whole-sediment concentrations (Cwhole) were often higher than or close to 1, signaling a possible toxicity concern to benthic organisms. In contrast, TUs based on the freely dissolved pore water concentrations (Cfree) measured by an ex-situ passive sampling method with polyethylene strips were 0.0007–0.005, much lower than 1, indicating no effect. We also found that the fractions of black carbon in sediments of the contaminated bay were significantly higher than those of reference sites. Overall, we conclude that carbon manufacturing plant effluent substantially increases Cwhole of PAHs in sediments but also increases the fraction of carbonaceous particles that strongly retain PAHs. As a combined result, bioavailable concentrations (as expressed by pore water Cfree) of PAHs do not increase as much as Cwhole. The results of this study indicate that ecotoxicological risks of PAH contamination by carbon manufacturing plants should be evaluated by directly measuring pore water Cfree instead of Cwhole.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Kumata2020,

title = {Elimination of interfering molybdenum oxyanion with an anion-exchange monolithic spin tip (AXTip) for precise determination of cadmium in human urine by ICP-MS},

author = {Hidetoshi Kumata and Chika Morimoto and Akihiro Horie and Akane Tanabe and Eiji Fujimori and Tomonari Umemura},

doi = {10.1016/J.TALO.2020.100009},

issn = {2666-8319},

year  = {2020},

date = {2020-01-01},

journal = {Talanta Open},

volume = {2},

pages = {100009},

publisher = {Elsevier},

abstract = {A simple purification technique using an anion-exchange monolithic spin tip was described for the elimination of molybdenum oxyanion interfering with precise determination of cadmium in human urine samples by ICP-MS. The tip device named “anion-exchange tip-in monolith (AXTip)” was laboratory-prepared within the confines of a commercially available syringe filter tip by a two-step process: (1) in situ copolymerization of glycidyl methacrylate (GMA) and ethylene dimethacrylate (EDMA) and (2) its subsequent modification with trimethylamine (TMA), as a strong anion-exchange functional group, via ring-opening reaction of epoxide. The adsorption capacity of the AXTip was > 3.2 μmol/tip for molybdenum oxyanion. The performance of the AXTip was evaluated through an adsorption/non-adsorption experiment for molybdenum, cadmium and other metal and metalloid species, using a model solution and human urine samples to optimize the sample solution's pH and dilution factor for the AXTip treatment. In the case of urine sample analysis, 8 times dilution and pH adjustment to 4.0 prior to AXTip treatment were found to allow > 98% elimination of interfering molybdenum oxyanions and quantitative recovery (103 ± 7%) of cadmium. At the optimized conditions, the AXTip treatment reduces Mo/Cd ratio from ~400 in human urines to < 10, which is sufficient for conducting ICP-MS measurement of cadmium in no-gas mode (without collision/reaction cell technique). The proposed purification technique was validated through the analysis of an accuracy control material of human urine (Seronorm™ Trace Elements Urine L-1). Good agreement of the observed values with the reference values indicates that the proposed technique is practically applicable.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Matsuo2020,

title = {Chemical Constituents of the Terrestrial Stems of Ephedra sinica and their PPAR-γ Ligand-Binding Activity},

author = {Yukiko Matsuo and Mayu Sasaki and Haruhiko Fukaya and Katsunori Miyake and Riko Takeuchi and Hidetoshi Kumata and Yoshihiro Mimaki},

url = {http://www.thieme-connect.de/products/ejournals/html/10.1055/a-1094-9229 http://www.thieme-connect.de/DOI/DOI?10.1055/a-1094-9229},

doi = {10.1055/A-1094-9229},

issn = {2509-9264},

year  = {2020},

date = {2020-01-01},

journal = {Planta Medica International Open},

volume = {7},

issue = {01},

pages = {e12-e16},

publisher = {© © Georg Thieme Verlag KG},

abstract = {<p>Bioassay-guided fractionation of the MeOH extract of \textit{Ephedra sinica} terrestrial stems, using a PPAR-γ ligand binding assay, resulted in the isolation of 10 compounds, including one new bisabolane-type sesquiterpenoid (\textbf{10}). The structure of the new compound was determined by extensive spectroscopic analysis, including two-dimensional (2D) NMR. Among the isolated compounds, the sitosterol derivatives (\textbf{1} and \textbf{2}), flavonoid glucoside (\textbf{7}), and the new sesquiterpenoid (\textbf{10}), showed significant PPAR-γ ligand-binding activity.</p>},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Fujimori2019,

title = {Investigation of adverse effect of coexisting aminopolycarboxylates on the determination of rare earth elements by ICP-MS after solid phase extraction using an iminodiacetate-based chelating-resin},

author = {E. Fujimori and S. Nagata and H. Kumata and T. Umemura},

doi = {10.1016/j.chemosphere.2018.09.073},

issn = {18791298},

year  = {2019},

date = {2019-01-01},

journal = {Chemosphere},

volume = {214},

abstract = {© 2018 Elsevier Ltd When iminodiacetic acid chelating-resin solid phase extraction (SPE) was used for the preconcentration of rare earth elements (REEs) in river water samples around sewage treatment plant (STP), low recovery values for heavy REEs were observed. In order to find out the reason for the low recovery, in the present paper, organic ligands in the STP effluent, which may compete with iminodiacetic acids, were analyzed by GC-NPD. It was found that EDTA was contained in the STP effluent at several-100 nM level and interfered with the adsorption of REEs, especially heavy REEs (present at pM level) on the chelating-resin due to the formation of stable complexes. Therefore, acid treatment was applied to decompose EDTA molecules. As a result of acid treatment with HNO3 and H2O2 at 170 °C for 4 h, all REEs were almost quantitatively recovered from the STP effluent with chelating-resin SPE with good reproducibility. After the acid treatment and subsequent 40-times preconcentration with SPE, all REEs in river water samples were precisely determined by ICP-MS at several-10 to sub pg mL−1 levels.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Takeuchi2019,

title = {化合物レベル炭素安定同位体比分析のための高等植物中のステロール及び脂肪酸の分離精製法の確立},

author = {竹内, 理子 and 力石, 嘉人 and 小川, 奈々子 and 風呂田, 郷史 and 大河内, 直彦 and 青木, 元秀 and 内田, 達也 and 梅村, 知也 and *熊田, 英峰},

doi = {10.2116/BUNSEKIKAGAKU.68.297},

issn = {0525-1931},

year  = {2019},

date = {2019-01-01},

urldate = {2019-01-01},

journal = {分析化学},

volume = {68},

issue = {5},

pages = {297-306},

publisher = {公益社団法人 日本分析化学会},

abstract = {The present paper describes a purification method utilizing a combination of conventional Silica gel solid-phase extraction (Si-SPE) and a semi-preparative normal-phase high-performance liquid chromatography (NP-HPLC) for non-esterified long-chain n-fatty acids and sterols extracted from plant tissue. The purpose involves compound-specific isotopic analyses (CSIA) by gas chromatography–isotope ratio mass spectrometry (GC-C-IRMS). The method first separates non-esterified target compounds from esterified ones by using Si-SPE. Then, the obtained polar compounds were further purified by semi-preparative NP-HPLC. An alkaline saponification or interesterification step, which is commonly used for a lipid biomarker preparation method for CSIA, was not employed in the method so as not to “mix” fatty acids, alcohols and sterols of esterified form with their non-esterified counterparts. Applying the method to the extract from raw leaves of Konara oak (Quercus serrate), long-chain n-fatty acids (≥ C26) and phytosterols, including terrestrial higher plant specific biomarker stigmast-5-en-3-β-ol (β-sitosterol) were successfully separated; they achieved “Base-to-Base” separation without any coeluting peaks on both GC-MS (Scan) and GC-C-IRMS chromatograms. The recovery and δ13C shift of the target component during the whole pretreatment procedure were 110-125 % and < 1 ‰, respectively. CSIA of β-sitosterol and long-chain n-fatty acids (C26,28) extracted and purified from the Konara leaves, sampled in April and October 2018, revealed a slight spring-to-fall13C-depletion of 1.4 ‰ for both compound classes. This trend resembles the previously reported results for other plant species, and could be ascribed to a seasonal variation of carbon isotopic discrimination in plants photosynthesis.},

note = {Development of purification method for compound specific carbon isotope analysis of phytosterols and long-chain n-fatty acids in higher plants, Takeuchi, R.; Chikaraishi Y.; Ogawa, N. O.; Furota, S.; Ohkouchi N.; Aoki M.; Uchida, T.; Umemura, T.; *Kumata, H.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Matsuguma2017,

title = {Microplastics in Sediment Cores from Asia and Africa as Indicators of Temporal Trends in Plastic Pollution},

author = {Yukari Matsuguma and Hideshige Takada and Hidetoshi Kumata and Hirohide Kanke and Shigeaki Sakurai and Tokuma Suzuki and Maki Itoh and Yohei Okazaki and Ruchaya Boonyatumanond and Mohamad Pauzi Zakaria and Steven Weerts and Brent Newman},

url = {https://doi.org/10.1007/s00244-017-0414-9},

doi = {10.1007/s00244-017-0414-9},

issn = {1432-0703},

year  = {2017},

date = {2017-01-01},

journal = {Archives of Environmental Contamination and Toxicology},

volume = {73},

issue = {2},

pages = {230-239},

abstract = {Microplastics (<5 mm) were extracted from sediment cores collected in Japan, Thailand, Malaysia, and South Africa by density separation after hydrogen peroxide treatment to remove biofilms were and identified using FTIR. Carbonyl and vinyl indices were used to avoid counting biopolymers as plastics. Microplastics composed of variety of polymers, including polyethylene (PE), polypropylene (PP), polystyrene (PS), polyethyleneterphthalates (PET), polyethylene-polypropylene copolymer (PEP), and polyacrylates (PAK), were identified in the sediment. We measured microplastics between 315 textmum and 5 mm, most of which were in the range 315 textmum--1 mm. The abundance of microplastics in surface sediment varied from 100 pieces/kg-dry sediment in a core collected in the Gulf of Thailand to 1900 pieces/kg-dry sediment in a core collected in a canal in Tokyo Bay. A far higher stock of PE and PP composed microplastics in sediment compared with surface water samples collected in a canal in Tokyo Bay suggests that sediment is an important sink for microplastics. In dated sediment cores from Japan, microplastic pollution started in 1950s, and their abundance increased markedly toward the surface layer (i.e., 2000s). In all sediment cores from Japan, Thailand, Malaysia, and South Africa, the abundance of microplastics increased toward the surface, suggesting the global occurrence of and an increase in microplastic pollution over time.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Saha2017,

title = {Seasonal trends of atmospheric PAHs in five asian megacities and source detection using suitable biomarkers},

author = {M. Saha and D. Maharana and R. Kurumisawa and H. Takada and B. G. Yeo and A. C. Rodrigues and B. Bhattacharya and H. Kumata and T. Okuda and K. He and Y. Ma and F. Nakajima and M. P. Zakaria and D. H. Giang and P. H. Viet},

doi = {10.4209/aaqr.2017.05.0163},

issn = {20711409},

year  = {2017},

date = {2017-01-01},

journal = {Aerosol and Air Quality Research},

volume = {17},

issue = {9},

abstract = {© Taiwan Association for Aerosol Research. The most prevalent pollutant, polycyclic aromatic hydrocarbons (PAHs) is now plenteously distributed in the global atmosphere. We recently quantified 36 polycyclic aromatic hydrocarbons (PAHs) associated with aerosols (particulate matter: PM) in five Asian cities: Tokyo (Japan), Beijing (China), Kolkata (India), Hanoi (Vietnam), and Kuala Lumpur (Malaysia). Average atmospheric PAH concentrations (∑12 PAHs-ng m –3 ) increased in the order of Kuala Lumpur (2.99) ≈ Tokyo (3.95) < Hanoi (7.99) < < Kolkata (63.5) < < Beijing (142.8). The most abundant PAHs in PM samples in these cities were chrysene, benz[a]anthracene, benzofluoranthenes, benzo[a] pyrene, and benzo[e]pyrene. We used the PAH compositions, especially the relative abundances of alkylated PAHs, and hopanes to determine vehicle exhaust-derived PAHs, and levoglucosan as a tracer for biomass burning, especially from wood combustion. Vehicle exhaust contributed to atmospheric PAHs in all cities, indicated by higher ratios of (C 30 17α)/total PAHs and MPAHs/PAHs than coal and wood combustion products. Coal combustion contributed also in winter aerosols in Beijing, indicated by higher abundance of β isomers i.e., 17β21β (H)-C 30 hopane (C 30 17β) and 17β21β (H)-C 29 hopane (C 29 17β) signifying mass use of coal for heating. The ratio of levoglucosan/PAHs was high in Kuala Lumpur and Hanoi, suggesting greater inputs of PAHs from biomass burning there.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{nokey,

title = {加圧溶媒抽出法を用いた路上粉塵中多環芳香族炭化水素（PAHs）の抽出溶媒の最適化とPAHs組成への影響},

author = {和紘 親松 and 元秀 青木 and 達也 内田 and 知也 梅村 and 英峰 熊田},

doi = {10.2116/bunsekikagaku.65.193},

year  = {2016},

date = {2016-01-01},

urldate = {2016-01-01},

journal = {分析化学},

volume = {65},

issue = {4},

pages = {193-201},

abstract = {© 2016 The Japan Society for Analytical Chemistry.Toluene and dichloromethane, as well as their combination with polar modifier methanol, were examined as extraction solvents for polycyclic aromatic hydrocarbons (PAHs) from urban particulate matter (PM) samples by using pressurized solvent extraction (PSE). Both solvents were chosen as frequently used "optimum" ones for extracting PAHs from various types of environmental matrices. Detailed analyses of purified extracts on GC-MS (SIM and SCAN) revealed that toluene, without any addition of methanol, gave the highest PAHs concentrations and least amount of unresolved complex mixture (UCM). The addition of methanol lowered the PAHs concentrations and elevated the UCM level, which was also the case for the dichloromethane-based system. Dichloromethane, even without methanol, gave a higher UCM level, and significantly lower the concentrations, especially in high-molecular-weight species (MW ≥ 228). Examining PAHs compositions revealed that some of source diagnostic isomer pair ratios (i.e., benz[a]anthracene/benz[a]anthracene+chrysene, benzo[a]pyrene/ benzo[e]pyrene, and indeno[1,2,3-cd]pyrene/indeno[1,2,3-cd]pyrene+benzo[ghi]perylene) were lower in the dichloromethane-based system than the toluene-based one. Our results suggest that the difference in extraction solvents must be taken into account when using isomer pair ratios for PAHs source diagnosis.},

note = {Optimization of the extraction solvent for polycyclic aromatic hydrocarbons (PAHs) from road dusts by using pressurized solvent extraction and evaluation of its impact on source diagnostic isomer pair ratios of PAHs, Chikamatsu, K.; Aoki, M.; Uchida, T.; Umemura, T.; *Kumata, H.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{nokey,

title = {放射性炭素同位体を用いた環境中多環芳香族炭化水素の起源解明},

author = {昌男 内田 and 英峰 熊田},

doi = {10.11203/jar.29.s133},

year  = {2014},

date = {2014-01-01},

journal = {エアロゾル研究},

volume = {29},

issue = {S1},

pages = {s133-s141},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Okuda2013,

title = {Rapid and simple determination of multi-elements in aerosol samples collected on quartz fiber filters by using EDXRF coupled with fundamental parameter quantification technique},

author = {T. Okuda and E. Fujimori and K. Hatoya and H. Takada and H. Kumata and F. Nakajima and S. Hatakeyama and M. Uchida and S. Tanaka and K. He and Y. Ma and H. Haraguchi},

doi = {10.4209/aaqr.2012.11.0308},

issn = {16808584},

year  = {2013},

date = {2013-01-01},

journal = {Aerosol and Air Quality Research},

volume = {13},

issue = {6},

abstract = {It would be convenient if we could achieve multi-component (organic and inorganic species) analysis using just one quartz fiber filter (QFF) as an aerosol collection medium. In general, QFF have been used for analyzing carbonaceous materials in aerosols. This study shows a nondestructive, rapid, and simple method using EDXRF (Energy Dispersive X-Ray Fluorescence spectrometry) that has secondary targets and three-dimensional polarization optics for analyzing inorganic multi-elements in aerosols collected on QFFs. Multi-element analysis can be achieved by using EDXRF coupled with fundamental parameter (FP) quantification, as speed of up to 900 s (15 min) per sample. The EDXRF-FP method shows good repeatability, with generally less than 5% variation when measuring each analyzed element. While the elemental concentrations in the blank QFFs in any lots examined in this study could be considered to be lower than the actual samples, the blank level of Ni cannot be ignored. The EDXRF-FP results for each element of the aerosols collected on QFF agreed well with ICP-MS and ICP-AES results. The temporal variations of the selected elements in aerosols obtained by EDXRF-FP showed very good agreement with those obtained by ICP-MS and AES, and thus this method is suitable for elucidating day-to-day variations of multi-elements in aerosols. © Taiwan Association for Aerosol Research.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Okuda2013b,

title = {Inorganic chemical characterization of aerosols in four Asian mega-cities},

author = {T. Okuda and H. Takada and H. Kumata and F. Nakajima and S. Hatakeyama and M. Uchida and S. Tanaka and K. He and Y. Ma},

doi = {10.4209/aaqr.2012.09.0250},

issn = {16808584},

year  = {2013},

date = {2013-01-01},

journal = {Aerosol and Air Quality Research},

volume = {13},

issue = {2},

abstract = {This study is a systematic field observation campaign that examines the chemical characteristics of aerosols in four different mega-cities in Asia, namely Beijing (China), Hanoi (Vietnam), Kolkata (India), and Tokyo (Japan). The unity of the analytical method and the synchronicity of the sampling periods are quite important, especially when developing a comparative risk assessment in different places. Sampling was thus carried out in each city continuously for a one-year period between 2008 and 2010, as this enabled consideration of the seasonal variations that are associated with the Asian monsoon system that governs the climate of this region. The study found that the sum of the concentrations of measured elements decreased in the order of BJ > KK > HA > TY, while the sum of the concentrations of measured ions decreased in the order of BJ > HA > KK > TY. The concentration level of chemical species in aerosols in Beijing was one order of magnitude higher than that in Tokyo. The risks associated with carcinogenic metals in the four cities have also been calculated. We conclude that the calculated carcinogenic risks to humans by chromium were higher than the risks caused by nickel in all four cities. Copyright © Taiwan Association for Aerosol Research.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Suto2011,

title = {Chemical sensing of metal ions using a silica-micelle mesophase doubly functionalized by a fluorogenic ionophore and a masking agent},

author = {Y. Suto and T. Uchida and H. Kumata and M. Tsuzuki and K. Fujiwara},

doi = {10.2116/analsci.27.673},

issn = {09106340},

year  = {2011},

date = {2011-01-01},

journal = {Analytical Sciences},

volume = {27},

issue = {7},

abstract = {We report on a chemical-sensing method based on the silica-micelle mesophase wherein both a fluoroionophore and a masking agent are embedded. Using this method, a highly selective detection of metal ions in an aqueous solution has been successfully demonstrated. Furthermore, simultaneous analyses of multisamples using a sensor array composed of functionalized mesoporous thin films were demonstrated for the first time. © 2011 The Japan Society for Analytical Chemistry.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Kumata2011,

title = {Evaluation of hydrogenated resin acids as molecular markers for tire-wear debris in urban environments},

author = {Hidetoshi Kumata and Mika Mori and Sho Takahashi and Shohei Takamiya and Mikio Tsuzuki and Tatsuya Uchida and Kitao Fujiwara},

url = {https://pubs.acs.org/doi/10.1021/es202156f},

doi = {10.1021/es202156f},

year  = {2011},

date = {2011-01-01},

journal = {Environmental Science and Technology},

volume = {45},

issue = {23},

pages = {9990-9997},

abstract = {To propose new molecular markers for tire-wear emissions, four dihydroresin acids, that is, 8-isopimaren-18-oic acid (I), 8-pimaren-18-oic acid (II), 13β(H)-abieten-18-oic acid (III), and 13α(H)-abiet-8-en-18-oic acid (IV), were identified and investigated for source specificities, distributions, and environmental stabilities. The absence of I-IV in natural sources and the linear correlations between dihydroresin acids with different skeletons in tires and in environmental samples demonstrated that I-IV are specific markers for synthetic rubbers. The ratio of III + IV to the sum of III + IV plus abietic acid showed the resin acids distribution between different environmental compartments receiving contributions from traffic and natural sources. The physicochemical properties and results of photolysis experiments suggested that I-IV can set lower limits for tire-wear contributions to environmental loads of particulate matter (PM) and polycyclic aromatic hydrocarbons with molecular weight ≥202. By comparing III + IV concentrations or (III+IV)/pyrene or (III+IV)/benzo[a]pyrene ratios in tires and those in environmental matrices, the contributions of tire-wear emissions to PM, pyrene, and benzo[a]pyrene were estimated to be 0.68 ± 0.54%, 6.9 ± 4.8%, and 0.37 ± 0.18% in roadside PM and 0.83 ± 0.21%, 0.88 ± 0.52%, and 0.08 ± 0.06% in rooftop PM.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Fujiwara2010,

title = {Construction of photo-decomposer for organic compounds in natural water and evaluation of its performance by chemiluminescence},

author = {K. Fujiwara and Y. Osako and T. Sasaki and H. Kumata and M. Aoki and N. Kawashima},

issn = {05251931},

year  = {2010},

date = {2010-01-01},

journal = {Bunseki Kagaku},

volume = {59},

issue = {11},

abstract = {COD (chemical oxygen demand) is one of the most popular methods for evaluating organic pollutants. In the present paper, a chemiluminescence detection method for measuring the concentration of permanganate ion after reacting with organic compounds is described ; the chemiluminescence occurs based on the direct reaction between permanganate and luminol. In order to use this system, a buffer solution, the concentrations of permanganate and luminol were inspected. Fifty μM of MnO 4 was reacted with the sample, and then the chemiluminescence was detected with a mixture solution (250 mL of 1.5 mM luminol, 250 mL of 0.01 M 1, 10-phenanthroline, and 500 mL of 1 M ammonium sulfate at pH 9.6 (adjusted with 25% ammonium solution). Also, a method for reducing the COD was proposed : where the sample solution flows a 100 m length PFA (perfluoroalkoxy-fluororesin) microtube (i.d. = 0.2 mm and o.d. = 0.4 mm). The PFA tube was wound around the outside of a quartz tube (o.d. = 30 mm},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{nokey,

title = {天然水中有機物の光分解装置の製作と化学発光法を用いたその性能評価},

author = {藤原, 祺多夫 and 大迫, 佑太 and 佐々木, 孝菜 and 熊田, 英峰 and 青木, 元秀 and 川島, 範男},

doi = {10.2116/bunsekikagaku.59.1021},

year  = {2010},

date = {2010-01-01},

urldate = {2010-01-01},

journal = {分析化学},

volume = {59},

issue = {11},

pages = {1021-1028},

abstract = {化学的酸素要求量（COD）測定法は，様々あるが，日本国内で最も用いられているのは，法定試験方法である酸化剤を過マンガン酸カリウムとしたCODMn（100℃ における過マンガン酸カリウムによる酸素要求量）である．本研究では，CODMnに則り，ルミノール化学発光を利用して全フロー系で測定する方法を考案し，その評価を行った．ここでは，有機物と反応した後の残存したMnO4−を，直接ルミノール化学発光で定量，COD対応値とする．また天然水のCODMnを低下（分解）するための光分解装置の作製とその分解能評価を化学発光で行う方法を考案した．ここでは，PFAマイクロチューブ（内径0.2 mm，外径0.4 mm）を石英ランプに巻きつけ，低圧水銀ランプを石英管中心部から照射する，安価かつ簡便な光分解装置を作製した．低圧水銀ランプの254 nm輝線の透過率は，石英管 : 82.8％，PFAマイクロチューブ : 55.0％ であった．従って，低圧水銀ランプから照射されている254 nm輝線はPFAマイクロチューブを通っている試料に45.5％ 当たっていることになる．この装置を用いて，有機化合物水溶液及び天然水のCOD測定と，その光分解に適用した．ここでCODについてほとんど光分解できない天然水から，90％ まで分解できるものが存在した． COD (chemical oxygen demand) is one of the most popular methods for evaluating organic pollutants. In the present paper, a chemiluminescence detection method for measuring the concentration of permanganate ion after reacting with organic compounds is described ; the chemiluminescence occurs based on the direct reaction between permanganate and luminol. In order to use this system, a buffer solution, the concentrations of permanganate and luminol were inspected. Fifty μM of MnO4 was reacted with the sample, and then the chemiluminescence was detected with a mixture solution (250 mL of 1.5 mM luminol, 250 mL of 0.01 M 1, 10-phenanthroline, and 500 mL of 1 M ammonium sulfate at pH 9.6 (adjusted with 25% ammonium solution). Also, a method for reducing the COD was proposed : where the sample solution flows a 100 m length PFA (perfluoroalkoxy-fluororesin) microtube (i.d. = 0.2 mm and o.d. = 0.4 mm). The PFA tube was wound around the outside of a quartz tube (o.d. = 30 mm},

note = {Construction of photo-decomposer for organic compounds in natural water and evaluation of its performance by chemiluminescence, Fujiwara, K.; Osako, Y.; Sasaki, T.; Kumata, H.; Aoki, M.; Kawashima, N.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Handa2010,

title = {Radiocarbon analysis of BC and OC in PM10 aerosols at Cape Hedo, Okinawa, Japan, during long-range transport events from East Asian countries},

author = {Daishi Handa and Hitomi Nakajima and Takemitsu Arakaki and Hidetoshi Kumata and Yasuyuki Shibata and Masao Uchida},

doi = {10.1016/j.nimb.2009.10.115},

year  = {2010},

date = {2010-01-01},

journal = {Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms},

volume = {268},

issue = {7-8},

pages = {1125-1128},

abstract = {We determined the 14C/12C ratio and concentrations of black carbon (BC) and organic carbon (OC) in airborne particulate matter (APM) with diameter <10 ??m (PM10) collected in Okinawa, Japan, between March and June 2008. During Asian dust events in March and April, APM and OC concentrations in PM10 aerosols were approximately threefold and twofold higher than those during the non-Asian-dust period in June. "Refractory" BC concentrations (i.e., because of refraction, <100% of BC was likely recovered) were also higher during Asian dust events than during the non-Asian-dust period. The percentages of modern carbon (pMC) in BC and OC were much smaller for PM10 aerosols collected during the Asian dust events (mean = 41.5% and 62.3%, respectively) than for those collected in the non-Asian-dust period (mean = 67.2% and 93.8%, respectively), indicating a strong influence of fossil-fuel-derived carbon during Asian dust events. One sample showed high OC concentration but relatively low BC concentration, suggesting formation during the long-range transport of biogenic organic compounds. The results suggest that not only fossil-fuel-derived air pollutants but also organic compounds derived from biomass in Asia should be considered to better characterize long-range transported aerosols. ?? 2009 Elsevier B.V. All rights reserved.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Uchida2010,

title = {Radiocarbon-based source apportionment of black carbon (BC) in PM10 aerosols from residential area of suburban Tokyo},

author = {Masao Uchida and Hidetoshi Kumata and Yasuyo Koike and Mikio Tsuzuki and Tatsuya Uchida and Kitao Fujiwara and Yasuyuki Shibata},

doi = {10.1016/j.nimb.2009.10.114},

year  = {2010},

date = {2010-01-01},

journal = {Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms},

volume = {268},

issue = {7-8},

pages = {1120-1124},

abstract = {The AMS technique was applied to analyse black carbon (BC), total organic carbon (TOC), and previously reported polycyclic aromatic hydrocarbons (PAHs) in PM10 aerosols from a residential area, suburban Tokyo, to determine natural abundance of radiocarbon (14C), an ideal tracer to distinguish fossil fuel (14C-free) from modern biomass combustion sources of pyrolytic products. The 14C concentrations in BC, isolated using the CTO-375 method, were 42% and 30% pMC (in terms of percent Modern Carbon: pMC) in summer and winter, respectively. The 14C concentrations in BC were also compared with those of compound-class specific 14C content of PAHs previously reported for the same samples: they were 45% and 33% pMC in summer and winter, respectively. The 14C signals of BC were identical to those of high molecular weight (MW ??? 226, 5-6 rings) PAHs. The resemblance between 14C signals of BC and PAHs can be referred as a 'certificate' for the validity of the BC isolation method employed in this study. Also, it suggests that 14C-BC approach can be a surrogate for PAHs specific 14C analyses to monitor seasonal source variation of combustion-derived pyrolytic products. On the other hand, 14C contents of total organic carbon in 2004 were 61% and 42% pMC in summer and winter, respectively. This is likely attributed to higher contribution of plant activity in summer. ?? 2009 Elsevier B.V. All rights reserved.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Lee2008,

title = {Particulate PAHs levels at Mt. Halla site in Jeju Island, Korea: Regional background levels in northeast Asia},

author = {Ji Yi Lee and Yong Pyo Kim and Naoki Kaneyasu and Hidetoshi Kumata and Chang Hee Kang},

year  = {2008},

date = {2008-01-01},

journal = {Atmospheric Research},

volume = {90},

issue = {1},

pages = {91-98},

abstract = {The levels of PM.25 PAHs at Mt. Halla site, Jeju Island, a background site in Korea were observed between March 1999 and March 2002. A seasonal variation was observed for the particulate PAHs concentrations with high levels during cold season similar to Gosan, a nearby coastal background site, due to the seasonal variations of fossil fuel usage in Asia. The total average concentration of ambient particulate PAHs was 404 ?? 579??pg m- 3, about one order lower than the ambient level at Gosan. However, the ratios of the anthropogenic inorganic ion concentrations between Mt. Halla and Gosan were smaller, 1.5 for non sea-salt (nss) sulfate and 2.7 for nitrate. Two possible explanations for these characteristics are (1) two sites measured different air parcels and/or (2) the effect of local emissions were different at two sites. Based on the Bep/BaP ratio result, upper air wind direction data, backward trajectory analysis, and LIDAR measurement data at Gosan, it was found that the degree of the effects of local emissions to the sampling sites be the major reason for the different PAHs levels at two sites though, in some cases, the air parcels arriving at Mt. Halla were different from those arriving at Gosan. For secondary aerosol such as nss sulfate, the lower concentration difference indicates both site are affected by regional transport. It points that the measurement result for directly emitted species such as PAHs at Gosan might be significantly influenced by local emissions. ?? 2008 Elsevier B.V. All rights reserved.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Murakami2008,

title = {Sorptive behavior of Nitro-PAHs in street runoff and their potential as indicators of diesel vehicle exhaust particles},

author = {Michio Murakami and Junya Yamada and Hidetoshi Kumata and Hideshige Takada},

year  = {2008},

date = {2008-01-01},

journal = {Environmental Science and Technology},

volume = {42},

issue = {4},

pages = {1144-1150},

abstract = {This is the first report to reveal the particle-water distribution of nitropolycyclic aromatic hydrocarbons (NPAHs) and to discuss their potential risks and utility as indicators of diesel vehicle exhaust particles (DEP). Time-series samples of runoff were collected from a highway, and NPAHs and polycyclic aromatic hydrocarbons (PAHs) were determined by gas chromatography-mass spectrometry (GC-MS) to study their dynamic behavior. The concentrations of total NPAHs ranged from 11 to 73 ng/L in particulate phase (>0.7 mcirom) and from 2.3 to 4.9 ng/L in dissolved phase (<0.7 microm). Like their PAH analogs, most (81-97%) NPAHs were associated with particulate matter. The organic carbon-normalized in situ partition coefficients (Koc') of NPAHs observed in runoff events (10(5.8-6.3) for 2-nitrofluoranthene and 10(5.8-6.2) for 1-nitropyrene [1-NP]) were more than 1 order of magnitude higher than those expected from their Kow, indicating great affinity for particulate matter such as soot. Concentrations of PAHs and NPAHs adjusted by potency equivalency factors and induction equivalency factors showed that the potential risks of NPAHs were smaller than those of PAHs by a factor of more than a hundred for the particulate phase and morethan fourforthe dissolved phase. Comparison of concentrations and compositions of NPAHs and PAHs among runoff, DEP, gasoline vehicle exhaust particles, boiler exhaust particles, and aerosols suggested that the ratio of 1-NP to total PAHs (1-NP/PAH) is a useful indicator of DEP for source apportionment of PAHs among traffic-related sources. Source-apportionment of PAHs in the runoff by 1-NP/PAH and methylphenanthrene/phenanthrene ratios suggested that most PAHs in the runoff except the second flush peak were derived from DEP but that other pyrogenic sources contributed to the particles at the second flush and thus to the overall runoff particles.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{nokey,

title = {韓国済州島ハルラ山における燃焼起源分子マーカーの季節変動},

author = {英峰 熊田 and 直樹 兼保 and Chang-Hee KANG and 優 後藤 and 達也 内田 and 幹夫 都筑 and 祺多夫 藤原},

doi = {10.14934/chikyukagaku.41.135},

year  = {2007},

date = {2007-01-01},

urldate = {2007-01-01},

journal = {地球化学},

volume = {41},

issue = {4},

pages = {135-143},

abstract = {In an attempt to elucidate sources of combustion to EC and other incomplete combustion products, we investigated seasonal variations of PAHs and molecular markers for biomass burning (levoglucosan: LG, dehydroabietic acid: DH and retene) in fine particulate mountain aerosols at the 1100 m declive of Mt. Halla, Jeju Island, Korea. PAHs observed at the site (sum of 3-6 ring parental PAHs: 0.05-7.8 ng/m3) were mostly of combustion origin and showed an intense signal in winter and several minor maxima in summer. Observations of LG (0.3-840 ng/m3) and resin diterpenoid markers (DHA: 0.1-127 ng/m3, retene:2-80 pg/m3) throughout the year evidenced biomass to be a significant source of combustion to the study site. Combination of PAHs isomer pair ratios and biomass-burning tracers revealed that biomass-burning contributions intermittently overwhelmed that from fossil fuel combustion. The backward trajectory analyses showed that the intense signals of LG/PAHs ratio in fall-winter were dominated by airmass from island areas while those in summer were ascribed to selective loss of PAHs by photochemical process. On the other hand, DHA and retene spikes in summer were judged to be from local Pinaceae combustion sources. Strong influence of westerly for samples with intense signal of biomass burning (i.e., LG, LG/PAH ratio and PAHs isomer pair ratios) indicates that biomass is an important source of combustions in the inland of East Asia and its pyrolytic products are available for long-range transport in winter.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Uchida2007,

title = {Source apportioning and molecular characterization of incomplete combustion products in PM1.1 and PM10 aerosols from residential areas of suburban Tokyo using natural abundance radiocarbon.},

author = {M Uchida and Y Koicke and H Kumata and H Nakata and M Tsuzuki and T Uchida and K Fujiwara and Y Shibata},

issn = {1026-4892},

year  = {2007},

date = {2007-01-01},

journal = {Organohalogen Compounds},

volume = {69},

pages = {744/1-744/3},

publisher = {International Symposium on Halogenated Environmental Organic Pollutants and Persistent Organic Pollutants},

abstract = {Incomplete combustion generates polycyclic arom. hydrocarbons (PAHs) and black carbon (BC), two of the most important classes of pollutants to the atm. environment. Radiocarbon (14C) is an ideal tracer to distinguish between fossil fuel (14C-free) from modern biomass combustion sources (101 pMC of atm. 14CO2 in 2004) of pyrogenic products. Our previous study revealed that 14C content (in terms of percent modern carbon: pMC) of PAHs in PM10 aerosols from suburban Tokyo (45 and 33% pMC in summer and winter, resp.) is far exceeding the statistic-based expectations (∼3%). For the same set of samples, we investigated 14C content of BC and TOC and the temporal variations of mol. markers from biomass burning (e.g., levoglucosan: LG2). The 14C-BC signals, 42 and 30% pMC in summer and winter aerosols, were significantly higher than those reported for the urban particulate matter from Washington DC (SRM1649a) but almost identical to those of high mol. wt. (MW≥226) PAHs in the same set of aerosol samples'. In addn., 14C-TOC, 62% and 42% pMC in summer and winter, resp., shows highest values compared with 14C-PAHs and 14C-BC results, suggesting higher contribution of plant activity in summer. However, it was significant low compared with modern carbon source from atm. 14CO2. [on SciFinder(R)]},

note = {CAPLUS AN 2009:313977(Journal; Computer Optical Disk)},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Kaneyasu2007,

title = {Chemical and optical properties of 2003 Siberian forest fire smoke observed at the summit of Mt. Fuji, Japan},

author = {N. Kaneyasu and Y. Igarashi and Y. Sawa and H. Takahashi and H. Takada and H. Kumata and R. Höller},

doi = {10.1029/2007JD008544},

issn = {01480227},

year  = {2007},

date = {2007-01-01},

journal = {Journal of Geophysical Research Atmospheres},

volume = {112},

issue = {13},

abstract = {Boreal forest fires are one of the major emission sources of trace atmospheric constituents in mid and high latitudes in the Northern Hemisphere. From late May through early June 2003, dense smoke aerosols that originated from large forest fires in Siberia were monitored on the summit of Mt. Fuji (3776 m msl.), Japan, a free-tropospheric height monitoring site where measurements of atmospheric chemistry were briefly intensified during a research project called Atmospheric Environmental Impact of Aerosols in East Asia (AIE). Inside a smoke layer, concentrations of black carbon (BC) measured by an Aethalometer exceeded 1900 ng m^{-3} with a concurent increase of carbon monoxide mixing ratio. The slope of a BC/CO regression line was steeper than those obtained in other studies using measurements from lower-altitude ground monitoring stations, suggesting minimal wet removal processes. The smoke aerosols contained high levels of n-alkanes of high molecular weight and indicated high carbon preference indices. The time series of CO and O<inf>3</inf> mixing ratios indicated a double-layered vertical structure in which a high O<inf>3</inf> mixing ratio layer lay on top of a smoke layer. The wavelength dependence of the absorption coefficient of the smoke showed a slope much steeper than that measured in urban influenced measurements. The higher absorption in the shorter wavelengths was consistent with an abundance of organic species within the smoke. Copyright 2007 by the American Geophysical Union.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Fujiwara2006,

title = {Flow injection analysis to measure the production ability of superoxide with chemiluminescence detection in natural waters},

author = {K. Fujiwara and H. Kumata and N. Kando and E. Sakuma and M. Aihara and Y. Morita and T. Miyakawa},

doi = {10.1080/03067310500352312},

issn = {03067319},

year  = {2006},

date = {2006-01-01},

journal = {International Journal of Environmental Analytical Chemistry},

volume = {86},

issue = {5},

abstract = {In connection with the photo-chemical processes in the aquatic environment, the evaluation system for the production ability of superoxide anion was constructed. The technique was based on the flow-injection method with luminol chemiluminescence detection. The injected sample was first irradiated by a solar simulator in a vortex quartz cell (cell volume = 0.167 mL), whose vortex face was exposed to light after passing through two air-mass filters. The carrier was the aqueous solution at pH 11 adjusted by NaOH. After irradiation was finished, the carrier (with sample) flow was merged with 1.52 mM of the luminol solution and was introduced into a chemiluminescence detector. The results of the laboratory experiment show that the production of superoxide is linearly related to the concentration of humic acid up to 50 ppm, and also to that of dissolved oxygen. In addition, the chemiluminescence intensity (superoxide production) was proportionally related with the irradiation intensity of the solar simulator. By means of changing the flow rate of the carrier, the half-life of superoxide at pH 11 aqueous solution was estimated to be 15 s. ESR was measured for the sample containing 0.5% humic acid, 0.5% NaOH, and 20 μL DMPO (spin trap agent). ESR spectra were obtained after 5 min of irradiation of the solar simulator. In addition to the four sharp peaks due to OH radicals, a broad peak appeared at the middle of the OH signal. The obtained signal cannot conclusively be ascribed to superoxide, but the peak that appeared may be due to the radical produced in the humic acid molecule. The river water was collected at 18 points of the Tamagawa River located in Tokyo. Upstream, the production ability of superoxide was observed, but not downstream or in the estuarine district. Although the concentration of humic acid is much higher in the estuarine sample, some quenching mechanisms work for superoxide production. © 2006 Taylor & Francis.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{nokey,

title = {Correlations of asthma mortality with traffic-related factors: Use of catalytic converters and radial tires},

author = {T. F. Dorsey Jr. and A. L. Lafleur and H. Kumata and H. Takada and P. Herrero-Jimenez and W. G. Thilly},

doi = {10.1097/01.jom.0000236402.08284.15},

issn = {10762752},

year  = {2006},

date = {2006-01-01},

journal = {Journal of Occupational and Environmental Medicine},

volume = {48},

issue = {12},

abstract = {OBJECTIVE: The objective of this study was to test the hypotheses that the post-1970 rise in asthma mortality in industrialized nations was related to introduction of catalytic converters and/or radial tires. METHODS: Annual asthma mortality data were plotted on linear coordinates for fraction of automobile fleet with converters or radial tires in Canada, Germany, Japan, and the United States. RESULTS: Catalytic converter association could not account for asthma mortality that rose in Germany before general adoption of the technology there. Radial tire use was, however, linearly correlated with asthma mortality in all four countries. CONCLUSION: Rising exposure to materials related to radial tire use may account for a substantial fraction of increased asthma mortality risk since approximately 1970. ©2006The American College of Occupational and Environmental Medicine.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Kumata2006,

title = {Compound class specific 14C analysis of polycyclic aromatic hydrocarbons associated with PM10 and PM1.1 aerosols from residential areas of suburban Tokyo},

author = {Hidetoshi Kumata and Masao Uchida and Eisuke Sakuma and Tatsuya Uchida and Kitao Fujiwara and Mikio Tsuzuki and Minoru Yoneda and Yasuyuki Shibata},

url = {http://pubs.acs.org/doi/abs/10.1021/es052407f},

doi = {10.1021/es052407f},

issn = {0013-936X},

year  = {2006},

date = {2006-01-01},

urldate = {2006-01-01},

journal = {Environmental Science and Technology},

volume = {40},

issue = {11},

pages = {3474-3480},

publisher = {ACS Publications},

abstract = {Compound class specific radiocarbon analysis (CCSRA) was performed for polycyclic aromatic hydrocarbons (PAHs) associated with airborne particulate matter (APM) with diameter <10 microm (PM10) and <1.1 microm (PM1.1) collected from a residential area of suburban Tokyo, Japan, and seasonal and particle-size radiocarbon variations were investigated. Source diagnostic isomer pair ratios indicated mixed contributions from petroleum combustion and from biomass and coal combustion to the PAHs in APM. The delta14C- PAHs in APM, ranging from -787 to -514 per thousand, indicated dominance of fossil fuel combustion. The delta14C of 5-6 rings (HMW) PAHs were higher than the 3-4 rings (LMW) species in both PM10 and PM1.1 samples. The delta14C of HMW-PAHs indicated greater biomass-burning contributions in summer than in winter and no apparent particle-size variation. Conversely, the delta14C of LMW species showed a greater contribution from fossil sources in summer and in larger particles (PM10). This finding could be tentatively attributed to the recondensation of fossil-PAHs vaporized from petroleum sources. A 14C isotopic mass balance approach estimated that biomass burning contributes 17-45% of the PAH burden in suburban Tokyo, and that the increase in the biomass-PAH accounts for approximately 27% and 22% of winter-time elevation of LMW- and HMW-PAHs, respectively. These are far exceeding what is expected from the emission statistics for CO2 and combusted materials in Japan and emphasizing the importance of biomass-burning as a source of PAHs; which, in turn, demonstrates the utility and the significance of field-based source assessment by using CCSRA for an effective regulation of atmospheric pollution by PAHs.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{nokey,

title = {多摩川河口域の水中および干潟表面からのアルキルフェノール類の非生物学的除去の可能性について},

author = {学 長南 and 英峰 熊田 and 陽子 村上 and 祺多夫 藤原},

doi = {10.2965/jswe.27.273},

year  = {2004},

date = {2004-01-01},

urldate = {2004-01-01},

journal = {水環境学会誌},

volume = {27},

issue = {4},

pages = {273-279},

abstract = {The abiotic removal (i.e., flocculation and photolysis) of alkylphenols (i. e., nonylphenol (NP) and octylphenol (OP)) from the estuarine environment was studied by investigating the environmental distributions of these compds. in the Tamagawa River, Japan and the photoinduced decrease in their concn. in water and on the tidal flat. The concns. of NP and OP in the dissolved form (<0.7μm) as well as in the 'total' (dissolved and particulate form) form decreased by 50% in the upper part of the inter tidal zone (salinity: 0-7‰). The 'mixing expt.' in which river water (salinity: 0‰) was mixed with seawater (salinity: 31.3‰) at various rates revealed an almost linear inverse relationship between total-NP and -OP concns. and water salinity. These results suggest that alkylphenols are removed from the water column through a process other than flocculation. Irradiated for 8 h using a solar simulator, the concn. of NP and OP dissolved in 1 mg·L-1 humic acid soln. decreased significantly (∼50%), whereas those in distd. water behaved more conservatively, this suggests that the photolytic decompn. of NP and OP can occur in natural waters. Although small, but significant amts. of alkylphenols were removed from a river sediment after a 6-h exposure to sunlight, the anoxic prodn. of NP and OP from their precursors in the sediment was revealed to be a far more important process than the photolytic decompn. [on SciFinder(R)]},

note = {Possibility of Abiotic Removal of Alkyiphenols from Water Column and Tidal Flat Surfaces in the Tamagawa River Estuary, Japan, CHONAN, Manabu; *KUMATA, Hidetoshi; MURAKAMI, Yoko; FUJIWARA, Kitao, Journal of Japan Society on Water Environment},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Okuda2004,

title = {Molecular composition and compound-specific stable carbon isotope ratio of polycyclic aromatic hydrocarbons (PAHs) in the atmosphere in suburban areas},

author = {T Okuda and H Kumata and H Naraoka and H Takada},

url = {http://www.terrapub.co.jp/journals/GJ/pdf/3801/38010089.pdf},

year  = {2004},

date = {2004-01-01},

journal = {Geochemical Journal},

volume = {38},

pages = {89-100},

abstract = {Molecular and carbon isotopic compositions of atmospheric polycyclic aromatic hydrocarbons (PAHs) were measured in sites at 1 m (S1), 10 m (S2) and approximately 200 m (S3) distant from roads in Tokyo, Japan. Total suspended particles (TSP) concentrations at S1 was approximately three times higher than S2 and S3, while the concentration of atmospheric PAHs was almost the same (76–166 g g–1-TSP) at S1, S2 and S3. Compound-specific 13C of atmospheric PAHs ranged from –23.3 to –24.5‰ at S1, from –24.1 to –25.6‰ at S2, and from –25.2 to –27.0‰ at S3. The concentration of some PAHs and the weighted averages of 13C of some selected PAHs differed significantly among the three sites. The PAH concentration ratios indicating automotive contribution were S1 > S2 > S3, while the ratios indicating non-vehicle contri- bution were S3 > S2 > S1. These differences in molecular and isotopic signatures among the three sites are not caused by photolysis, instead they are possibly due to differences in the sources of PAHs. A quantitative approach to identify compound-specific sources is to use the concentration and PAHs at each site. The estimated average 13C of individual using a mass balance model, ranged from –19.5 to –23.6‰. Taking into account the results of this study and those of previous studies, –26 to –28‰ was adopted as the identify such compound-specific sources of atmospheric PAHs.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{nokey,

title = {プラスチック製食器等からのノニルフェノールの溶出},

author = {友彦 磯部 and 典秀 中田 and ゆき枝 間藤 and 肇 西山 and 英峰 熊田 and 秀重 高田},

doi = {10.5985/jec.12.621},

year  = {2002},

date = {2002-01-01},

journal = {環境化学},

volume = {12},

issue = {3},

pages = {621-625},

abstract = {プラスチック製の食器等について, 油脂性食品疑似溶媒であるn-ヘプタンを用いた溶出試験を行なった。50種の製品の分析から, 16試料で有意にノニルフェノールが溶出し, そのうち5試料で特に高濃度 (21～2485ng/cm2) で検出された。ポリスチレンおよびポリプロピレン製品からの溶出が最も大きかったものの, 検出量には大きな変動が認められ, その変動には明確な傾向は認められなかった。今後さらに密で広範囲な調査を行ない, プラスチック製食器に起因する内分泌撹乱化学物質の人体への曝露量を評価すると共に, リスクを軽減するための施策を講じる必要があると思われる。},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Sakurai2002,

title = {Study of in vitro cytotoxicity of arsenocholine, a trimethyl arsenic compound in seafood},

author = {T. Sakurai and M. Ochiai and C. Kojima and H. Kumata and K. Fujiwara},

doi = {10.1002/aoc.324},

issn = {02682605},

year  = {2002},

date = {2002-01-01},

journal = {Applied Organometallic Chemistry},

volume = {16},

issue = {8},

abstract = {We examined the in vitro cytotoxic effects of an organic arsenic compound contained in seafood, viz. the trimethyl (2-hydroxyethyl)-arsonium cation, or arsenocholine (AsCho), on some murine immune effector cells, such as splenocytes, thymocytes, Peyer's patch lymphocytes, peritoneal macrophages and bone marrow (BM) cells using synthesized pure material. We found that AsCho had no cytotoxicity on most immune effector cells, even at concentrations over 10 mmol dm-3, and it slightly but significantly enhanced the viability of BM cells at doses over 100 μmol dm-3. This biological effect of AsCho on BM cells might be direct rather than due to autocrine mechanisms mediating some factors secreted by AsCho-stimulated BM cells, because the culture supernatants of BM cells pre-stimulated with AsCho did not influence the viability of other fresh BM cells. It is interesting that this unique biological effect was found in AsCho, an organic arsenic compound contained in some marine animals that are ingested daily as seafood in many countries. Copyright © 2002 John Wiley & Sons, Ltd.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Kojima2002,

title = {Cytotoxicological aspects of the organic arsenic compound arsenobetaine in marine animals},

author = {Chikara Kojima and Teruaki Sakurai and Masayuki Ochiai and Hidetoshi Kumata and Wei Qu and Michael P. Waalkes and Kitao Fujiwara},

year  = {2002},

date = {2002-01-01},

journal = {Applied Organometallic Chemistry},

volume = {16},

issue = {8},

pages = {421-426},

abstract = {In this study, we investigated the in vitro cytotoxicity of arsenobetaine [AsBe; trimethyl (carboxymethyl) arsonium zwitterion], which is a major organic arsenic compound in marine animals, to various mammalian cells, such as mouse macrophage RAW264.7 cells, rat liver TRL1215 cells and human skin TIG-112 cells, using a synthetic pure material. As a result, we demonstrated that the cytotoxicity of AsBe is very weak even at concentrations over 20 mmol dm(-3) in all these cells. Also, AsBe did not affect various functions of the murine macrophage RAW264.7 cells, viz interleukin-1alpha production, cellular lysosomal enzyme (acid phosphatase) activity and nitric oxide (NO2-) secretion. AsBe showed a weak effect on the reduced glutathione (GSH) levels in these cells, and it slightly reduced the cellular GSH levels for a while. These data suggest that AsBe shows no cytotoxicity but has some effects on mammalian cells. Copyright (C) 2002 John Wiley Sons, Ltd.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Zakaria2002,

title = {Distribution of polycyclic aromatic hydrocarbons (PAHs) in rivers and estuaries in Malaysia: A widespread input of petrogenic PAHs},

author = {Mohamad Pauzi Zakaria and Hideshige Takada and Shinobu Tsutsumi and Kei Ohno and Junya Yamada and Eriko Kouno and Hidetoshi Kumata},

doi = {10.1021/es011278+},

year  = {2002},

date = {2002-01-01},

urldate = {2002-01-01},

journal = {Environmental Science and Technology},

volume = {36},

issue = {9},

pages = {1907-1918},

abstract = {This is the first publication on the distribution and sources of polycyclic aromatic hydrocarbons (PAHs) in riverine and coastal sediments in South East Asia where the rapid transfer of land-based pollutants into aquatic environments by heavy rainfall and runoff waters is of great concern. Twenty-nine Malaysian riverine and coastal sediments were analyzed for PAHs (3-7 rings) by gas chromatography mass spectrometry. Total PAHs concentrations in the sediment ranged from 4 to 924 ng/g. Alkylated homologues were abundant for all sediment samples. The ratio of the sum of methylphenanthrenes to phenanthrene (MP/P), an index of petrogenic PAHs contribution, was more than unity for 26 sediment samples and more than 3 for seven samples for urban rivers covering a broad range of locations. The MP/P ratio showed a strong correlation with the total PAHs concentrations, with an r2 value of 0.74. This ratio and all other compositional features indicated that Malaysian urban sediments are heavily impacted by petrogenic PAHs. This finding is in contrast to other studies reported in many industrialized countries where PAHs are mostly of pyrogenic origin. The MP/P ratio was also significantly correlated with higher molecular weight PAHs such as benzo[a]pyrene, suggesting unique PAHs source in Malaysia which contains both petrogenic PAHs and pyrogenic PAHs. PAHs and hopanes fingerprints indicated that used crankcase oil is one of the major contributors of the sedimentary PAHs. Two major routes of inputs to aquatic environments have been identified: (1) spillage and dumping of waste crankcase oil and (2) leakage of crankcase oils from vehicles onto road surfaces, with the subsequent washout by street runoff. N-Cyclohexyl-2-benzothiazolamine (NCBA), a molecular marker of street dust, was detected in the polluted sediments. NCBA and other biomarker profiles confirmed our hypothesis of the input from street dust contained the leaked crankcase oil. The fingerprints excluded crude oil, fresh lubricating oil, asphalt, and tire-particles as major contributors.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Okuda2002,

title = {Source identification of Malaysian atmospheric polycyclic aromatic hydrocarbons nearby forest fires using molecular and isotopic compositions},

author = {Tomoaki Okuda and Hidetoshi Kumata and Mohamad Pauzi Zakaria and Hiroshi Naraoka and Ryoshi Ishiwatari and Hideshige Takada},

doi = {10.1016/S1352-2310(01)00506-4},

year  = {2002},

date = {2002-01-01},

urldate = {2002-01-01},

journal = {Atmospheric Environment},

volume = {36},

issue = {4},

pages = {611-618},

abstract = {We report measurements of molecular and carbon isotopic compositions of Malaysian atmospheric polycyclic aromatic hydrocarbons (PAHs) in smoke haze from the 1997 Indonesian forest fire. Comparison of the carbon isotopic compositions (δ13C) of individual PAHs from the smoke haze, with those from other PAHs sources (soot collected from gasoline and diesel vehicle muffler, woodburning smoke), enables us to discriminate among the diverse sources of atmospheric PAHs. Soot PAHs extracted from gasoline and diesel vehicles show heavy isotopic signatures with a large inter-species δ13C variation from -12.9‰ to -26.6‰, compared to soot PAHs extracted from woodburning smoke which are isotopically light, and have a small inter-species δ13C variation from -26.8‰ to -31.6‰. Values from -17.7‰ to -27.9‰ were obtained for the corresponding PAHs extracted from the smoke haze, indicating that they are derived mainly from automotive exhaust. Molecular and isotopic compositions of PAHs extracted from smoke haze were similar to those extracted from non-haze aerosol. Quantitative estimation shows that woodburning contribution to Malaysian atmospheric PAHs ranges from 25% to 35% with no relation to haze intensity, while automotive contribution ranges from 65% to 75%. These results suggest that the major contributor of PAHs in Malaysian air is automotive exhaust whether smoke haze is observed or not. © 2002 Elsevier Science Ltd. All rights reserved.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Okuda2002b,

title = {Origin of atmospheric polycyclic aromatic hydrocarbons (PAHs) in Chinese cities solved by compound-specific stable carbon isotopic analyses},

author = {Tomoaki Okuda and Hidetoshi Kumata and Hiroshi Naraoka and Hideshige Takada},

doi = {10.1016/S0146-6380(02)00180-8},

year  = {2002},

date = {2002-01-01},

urldate = {2002-01-01},

journal = {Organic Geochemistry},

volume = {33},

issue = {12},

pages = {1737-1745},

abstract = {We report measurement of molecular and carbon isotopic compositions of atmospheric polycyclic aromatic hydrocarbons (PAHs) in three Chinese cities, Beijing, Chongqing, and Hangzhou. Precision of δ13C measurement by GC/C/ IRMS ranged from 0.4 to 0.7‰, and accuracy ranged from 0.0 to 0.4‰. δ13C of atmospheric PAHs ranged from -22.9 to -27.2‰ for Chongqing, from -24.2 to -26.8‰ for Hangzhou, from -21.1 to -26.1‰ for Beijing summer and from -22.5 to -25.7‰ for Beijing winter. Atmospheric PAHs of both Chongqing and Hangzhou become more depleted in 13C with increasing PAH molecular weight. On the other hand, atmospheric PAHs in Beijing become more enriched in 13C with increasing PAH molecular weight. The difference of isotopic signature between "Beijing" and "Chongqing + Hangzhou" is statistically significant (t-test, P < 0.05). The isotopic trends of PAHs in Chongqing and Hangzhou are similar to that obtained from fluidized-bed coal combustion particles, whereas the isotopic trend of PAHs in Beijing air is similar to that obtained from automotive exhaust particles. According to this observation, it appears that automotive exhausts significantly affect PAH loading to Beijing air and that coal combustion is the main cause of PAH existence in Chongqing and Hangzhou air. While the isotopic signatures can classify the three Chinese cities into two groups, the molecular profiles do not show a clear trend among them. This can be explained by the following description: carbon isotopic signatures of PAHs are expected to have source- and/or combustion field-specific values and patterns mainly, whereas molecular compositions of PAHs depend on various factors such as source material, burning temperature, air/fuel ratio, and environmental alteration during transport. © 2002 Elsevier Science Ltd. All rights reserved.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Okuda2002c,

title = {Vertical distributions and δ13C isotopic compositions of PAHs in Chidorigafuchi Moat sediment, Japan},

author = {Tomoaki Okuda and Hidetoshi Kumata and Hiroshi Naraoka and Ryoshi Ishiwatari and Hideshige Takada},

doi = {10.1016/S0146-6380(02)00031-1},

year  = {2002},

date = {2002-01-01},

urldate = {2002-01-01},

journal = {Organic Geochemistry},

volume = {33},

issue = {7},

pages = {843-848},

abstract = {Compound-specific carbon isotope analysis and molecular composition analysis were performed on polycyclic aromatic hydrocarbons (PAHs) extracted from a dated 50 cm sediment core from the Chidorigafuchi Moat, Japan. δ13C values ranged from -23.0 to -26.9‰ for individual PAHs, and ranged from -24.0 to -25.5‰ for the weighted average of PAHs at different core depths. Whilst total PAH concentrations showed a distinct maximum at around the year 1960, δ13C values did not show a statistically significant feature in the corresponding section of the core. Indeed, there was little correlation (r2=0.12},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{nokey,

title = {中国,日本,マレーシアのエアロゾル中の多環式芳香族炭化水素組成},

author = {英峰 熊田 and 秀重 高田 and モハマド パウジ ザカリア},

doi = {10.20612/rog.15.0_13},

year  = {2000},

date = {2000-01-01},

journal = {Researches in Organic Geochemistry},

volume = {15},

pages = {13-25},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{nokey,

title = {東アジアのエアロゾルの有機地球化学的特徴},

author = {茂生 森永 and 英峰 熊田 and 知明 奥田 and ザカリア モハマド・パウジ and 秀重 高田},

doi = {10.11203/jar.15.313},

year  = {2000},

date = {2000-01-01},

journal = {エアロゾル研究},

volume = {15},

issue = {4},

pages = {313-320},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Kumata2000,

title = {Water-particle distribution of hydrophobic micro pollutants in storm water runoff},

author = {H. Kumata and K. Masuda and J. Yamada and H. Takada},

issn = {10406638},

year  = {2000},

date = {2000-01-01},

journal = {Polycyclic Aromatic Compounds},

volume = {20},

issue = {1-4},

pages = {39-54},

abstract = {Sorptive behaviors of polycyclic aromatic hydrocarbons (PAHs) as well as other classes of hydrophobic pollutants (i.e., n-alkanes and linear alkylbenzenes: LABs) were investigated for street runoff and for particle-size segregated river water samples. PAHs, except for 3-ring aromatics, were mostly transported witn particles >1.2μm. In all the environmental samples PAHs were more hydrophobic than expected from their Kow; whereas vigorous mixing of road dust with water for 24 hours resulted in more desorption of PAHs into the aqueous phase. It indicates that although strongly associated with particles, at least some part of the "particle bound" PAHs could be available for active exchange with their dissolved counterparts. As opposed to PAHs, n-alkanes and LABs revealed less hydrophobic nature than expected from Kow, although their majorities were in "particulate form".},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Kumata2000b,

title = {Historical trends of N-cyclohexyl-2-benzothiazolamine, 2-(4- morpholinyl)benzothiazole, and other anthropogenic contaminants in the urban reservoir sediment core},

author = {Hidetoshi Kumata and Yukihisa Sanada and Hideshige Takada and Takashi Ueno},

doi = {10.1021/es990738k},

year  = {2000},

date = {2000-01-01},

urldate = {2000-01-01},

journal = {Environmental Science and Technology},

volume = {34},

issue = {2},

pages = {246-253},

abstract = {A new potential molecular marker, N-cyclohexyl-2-benzolhiazolamine (NCBA), was discovered in Various environmental matrices (i.e., road dusts, runoff- and river-water particles, river sediments, aerosols) taken in Tokyo, Japan. Concurrent determination of this compound together with 2-(4-morpholinyl)benzothiazole (24MoBT), previously proposed marker of road dust, demonstrated that both compounds are widely distributed in the urban environment (similar to ng/g to similar to mu g/g), derived from Vehicle tire tread, and transported in the environments in the same way. To assess utilities of NCBA and 24MoBT as molecular markers for vehicle-derived contaminants, these compounds were analyzed in a sediment core from the Chidorigafuchi Moat of Imperial Palace, situated in the center of Tokyo. Remarkable is that NCBA existed at higher concentrations than 24MoBT near the surface (0-6 cm depth) and bottom parts (16-24 cm depth) of the region where BTs were detected hut lower in the middle parts (6-16 cm depth). Dating of the core by using (137)Cs and tetrapropylene-based alkylbenzenes (TABs) revealed the two changeovers coincide well with changes in the production history of vulcanization accelerators containing the compounds. The dated downcore profile of Sigma BTs (sum of 24MoBT and NCBA) showed positive correlation with the traffic data in Tokyo Metropolitan Area. These results indicate the usefulness of NCBA and 24MoBT as time markers for recent sections of sediment cores and as molecular markers for reconstructing the history of traffic-induced contamination.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Nakada1999,

title = {Broad-spectrum analysis of endocrine disruptors in environmental samples},

author = {N. Nakada and T. Isobe and H. Nishiyama and K. Okuda and S. Tsutsumi and J. Yamada and H. Kumata and H. Takada},

issn = {05251931},

year  = {1999},

date = {1999-01-01},

journal = {Bunseki Kagaku},

volume = {48},

issue = {6},

abstract = {A comprehensive analytical method of endocrine disruptors (i.e., alkylphenols, phthalic acid esters, bisphenol A, polycyclic aromatic hydrocarbons, polychlorinated biphenyls, DDTs) in environmental samples was developed. The method employs Soxhlet-extraction with dichloromethane and two-step-silica-gel and activated-charcoal column chromatography, which provides eleven fractions, followed by determination on capillary GC equipped with MSD or ECD. The present method was applied to Tokyo Bay sediments. Most of the target compounds were identified and quantified clearly, demonstrating the applicability to various environmental samples. Their concentrations are as follows: 4-t- octylphenol: 10.0 ng/g; 4-t-nonylphenol: 184 ng/g; benzyl n-butyl phthalate: 6.12 ng/g; dicyclohexyl phthalate: 2.56 ng/g; bisphenol A: 6.58 ng/g; benz[a]anthracene: 58.1 ng/g; benzo[a] pyrene: 93.7 ng/g; IUPAC#77 coplanar PCB: 0.82 ng/g; DDT: 0.42 ng/g; ODD: 1.00 ng/g; DDE: 1.37 ng/g. This method provides a powerful analytical tool to investigate a wide range of endocrine disruptors in samples of limited quantity.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{nokey,

title = {環境試料中の内分泌攪乱化学物質の包括的分析},

author = {典秀 中田 and 友彦 磯部 and 肇 西山 and 啓司 奥田 and 史薫 堤 and 淳也 山田 and 英峰 熊田 and 秀重 高田},

doi = {10.2116/bunsekikagaku.48.535},

year  = {1999},

date = {1999-01-01},

urldate = {1999-01-01},

journal = {分析化学},

volume = {48},

issue = {6},

pages = {535-547},

abstract = {A comprehensive analytical method of endocrine disruptors (i.e., alkylphenols, phthalic acid esters, bisphenol A, polycyclic aromatic hydrocarbons, polychlorinated biphenyls, DDTs) in environmental samples was developed. The method employs Soxhlet-extraction with dichloromethane and two-step-silica-gel and activated-charcoal column chromatography, which provides eleven fractions, followed by determination on capillary GC equipped with MSD or ECD. The present method was applied to Tokyo Bay sediments. Most of the target compounds were identified and quantified clearly, demonstrating the applicability to various environmental samples. Their concentrations are as follows: 4-t- octylphenol: 10.0 ng/g; 4-t-nonylphenol: 184 ng/g; benzyl n-butyl phthalate: 6.12 ng/g; dicyclohexyl phthalate: 2.56 ng/g; bisphenol A: 6.58 ng/g; benz[a]anthracene: 58.1 ng/g; benzo[a]pyrene: 93.7 ng/g; IUPAC#77 coplanar PCB: 0.82 ng/g; DDT: 0.42 ng/g; ODD: 1.00 ng/g; DDE: 1.37 ng/g. This method provides a powerful analytical tool to investigate a wide range of endocrine disruptors in samples of limited quantity.},

note = {Broad-spectrum analysis of endocrine disruptors in environmental samples, Nakada, N.; Isobe, T.; Nishiyama, H.; Okuda, K.; Tsutsumi, S.; Yamada, J.; Kumata, H.; Takada, H.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{nokey,

title = {放射性核種およびmolecular markerによる東京湾の堆積過程の解明},

author = {幸尚 真田 and 太 佐藤 and 英峰 熊田 and 秀重 高田 and 愛 山本 and 義久 加藤 and 隆 上野},

url = {http://ci.nii.ac.jp/naid/110008679976/ja/},

issn = {03864073},

year  = {1999},

date = {1999-01-01},

journal = {地球化学},

volume = {33},

issue = {2},

pages = {123-138},

publisher = {日本地球化学会},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Kumata1996b,

title = {Determination of 2-(4-Morpholinyl)benzothiazole in Environmental Samples by a Gas Chromatograph Equipped with a Flame Photometric Detector.},

author = {H. Kumata and H. Takada and N. Ogura},

issn = {0003-2700},

year  = {1996},

date = {1996-01-01},

urldate = {1996-01-01},

journal = {Analytical chemistry},

volume = {68},

issue = {11},

pages = {1976-1981},

institution = {Faculty of Agriculture, Tokyo University of Agriculture and Technology, Fuchu, Tokyo 183, Japan.},

abstract = {2-(4-Morpholinyl)benzothiazole (24MoBT) exists in automobile tire rubber as an impurity of a vulcanization accelerator and has been proposed as a potential molecular marker of street runoff (Spies, R. B.; Andresen, B. D.; Rice, D. W., Jr. Nature 1987, 327, 697-699). The present paper describes an analytical method for 24MoBT in environmental samples (e.g., street dusts and river sediments) by gas chromatography. The method relies upon extraction with a 6:4 (v/v) mixture of benzene and methanol, purification by acid extraction, and adsorption column chromatography, followed by determination using capillary GC equipped with a sulfur-selective detector (i.e., FPD). The recovery of 24MoBT for the entire procedure was 85%, and the relative standard deviation for four replicated analyses was 1.5%. The detection limit was 0.08 ng injected 24MoBT, corresponding to 0.20 ng/g of dry sample. The selectivity and sensitivity of the present method permit the determination of 24MoBT at the trace levels (e.g., ∼ng/g) encountered in environmental samples. 24MoBT concentrations in various environmental samples are also reported.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}