Publication

@article{nokey,

title = {Simple analytical method to determine urinary isotopic enrichment of phenylalanine by GC/EI-MS coupled with pentafluorobenzyl derivatization},

author = {Hidetoshi Kumata and Haruka Ochiai and Anna Tanaka and Shiori Oda and Kazuko Ishikawa-Takata and Tomonari Umemura},

doi = {10.1016/j.talanta.2025.127697},

isbn = {0039-9140},

year  = {2025},

date = {2025-05-15},

urldate = {2025-05-15},

journal = {Talanta},

volume = {287},

pages = {127697},

abstract = {The indicator amino acid oxidation (IAAO) technique estimates the physiological requirements for amino acids and proteins in living organisms, including humans. It involves monitoring urinary amino acids and exhaled CO2 after ingesting 1-13C-labeled (carboxy-labeled) amino acids. The most common IAAO indicator amino acid is 1-13C-labeled phenylalanine ([1-13C]Phe). Its urinary concentration in test subjects ranges from below the detection limit to several μM. A simple analytical method for distinguishing trace amounts of [1-13C]Phe in urine from high levels of naturally occurring Phe is crucial for making IAAO tests easier. This study presents a simple and reliable approach for the simultaneous quantification of [1-13C]Phe and Phe in human urine using conventional GC-EI-MS. In this method, urinary phenylalanine is reacted with pentafluorobenzyl bromide in a single-phase solvent system of acetone-borate buffer without dehydration or desalting to form disubstituted pentafluorobenzyl (PFB) derivatives, which are then analyzed by GC-EI-MS (SIM). The Phe and [1-13C]Phe PFB derivative peaks eluted at the same retention time on the gas chromatogram but could be differentiated on the basis of fragment ions (m/z 434, 435) derived from the loss of the phenyl group ([M − 91]+). Correcting the interference of the m+1 isotope peak of Phe in the [M − 91] fragment (m/z 435) of [1-13C]Phe using the m/z 434 peak intensity and natural isotope ratio, both Phe and [1-13C]Phe could be quantified in the concentration range found in urine. The method was successfully applied to examine the temporal enrichment of [1-13C]Phe in urine samples obtained from IAAO subjects following the ingestion of a test meal containing [1-13C]Phe.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{nokeyb,

title = {Source apportionment of atmospheric and sedimentary PAHs from Kolkata, India using compound-class-specific radiocarbon analysis (CCSRA)},

author = {Hidetoshi KUMATA and Masao UCHIDA and Mahua SAHA and Shoichi SAITOH and Kanako MANTOKU and Toshiyuki KOBAYASHI and Tomoaki OKUDA and Fumiyuki NAKAJIMA and Shiro HATAKEYAMA and Yasuyuki SHIBATA and Hideshige TAKADA},

url = {https://doi.org/10.1017/RDC.2024.66},

doi = {10.1017/RDC.2024.66},

year  = {2024},

date = {2024-09-18},

urldate = {2024-09-24},

journal = {Radiocarbon},

volume = {66},

issue = {5},

pages = {892-903},

abstract = {Polycyclic aromatic hydrocarbons (PAHs) are major air pollutants that are ubiquitously produced by the combustion of organic materials, and it is extremely important to identify their pollution sources. In this study, molecular fingerprinting and compound class-specific radiocarbon dating (CCSRA) were performed on PAHs from canal sediments and air samples collected in Kolkata, India’s third largest city (population approximately 16 million), where PAHs pollution has been a serious problem. Average PAH (Σ12-parent PAHs) concentrations in air samples were 65.1 ng m–3 in summer and 70.9 ng m–3 in winter and in canal sediments were 32.7 µg g–1, which are classified as “very high-level” pollution. Molecular fingerprinting using methyl-PAH/PAH (MPAHs/PAHs) ratios and isomer pair ratios with molecular weights of 178, 202, 228, and 276 suggested that wood and coal combustion were the dominant sources of PAHs in the sediment, and that atmospheric PAHs were influenced by oil combustion in addition to them. The fraction of contemporary carbon (ƒC) of sedimentary PAHs (0.056–0.100), together with the extremely low MPAHs/PAHs ratio results, lead to the conclusion that the major source of the high concentration of PAHs in the canals is from coal combustion. On the other hand, the ƒC of atmospheric PAHs (0.272–0.369) was close to the share of biomass fuels in India’s domestic fuel consumption in 2011 (about 35%). Furthermore, the observed ƒC-discrepancy between atmospheric and sedimentary PAHs in the same urban environment was interpreted to give an insight into the loading pathway of PAHs to canal sediments in Kolkata.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{nokeyc,

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},

isbn = {0018-3342/23},

year  = {2023},

date = {2023-06-01},

urldate = {2023-06-01},

journal = {保健の科学},

volume = {65},

pages = {387-393},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{田中杏奈2023,

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 = {杏奈 田中 and 陽香 落合 and 英峰 熊田 and 剛司 榎本 and 知也 梅村},

doi = {10.2116/bunsekikagaku.72.407},

year  = {2023},

date = {2023-01-01},

urldate = {2023-01-01},

journal = {分析化学},

volume = {72},

number = {10.11},

pages = {407-416},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Matsuo12.02.2020,

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 = {https://doi.org/10.1055/a-1094-9229},

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

issn = {2509-9264},

year  = {2020},

date = {2020-02-20},

journal = {Planta Medica International Open},

volume = {7},

number = {01},

pages = {e12-e16},

note = {e12},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{KUMATA2020100009,

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},

url = {http://www.sciencedirect.com/science/article/pii/S2666831920300096},

doi = {https://doi.org/10.1016/j.talo.2020.100009},

issn = {2666-8319},

year  = {2020},

date = {2020-01-01},

journal = {Talanta Open},

pages = {100009},

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{ENDO2020113448,

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

author = {Satoshi Endo and Mitsuki Yoshimura and Hidetoshi Kumata and Masao Uchida and Yoshinori Yabuki and Haruhiko Nakata},

url = {http://www.sciencedirect.com/science/article/pii/S0269749119349796},

doi = {https://doi.org/10.1016/j.envpol.2019.113448},

issn = {0269-7491},

year  = {2020},

date = {2020-01-01},

journal = {Environmental Pollution},

volume = {256},

pages = {113448},

abstract = {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{articlef,

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 Parajo and Hidetoshi Kumata and Tomonari Umemura and Hiroki Inoue and Kohei Arasaki and Felix Campelo and Mitsuo Tagaya},

doi = {10.1083/jcb.202002150},

year  = {2020},

date = {2020-01-01},

journal = {Journal of Cell Biology},

volume = {220},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{竹内理子2019,

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

doi = {10.2116/bunsekikagaku.68.297},

year  = {2019},

date = {2019-04-01},

journal = {分析化学},

volume = {68},

number = {5},

pages = {297-306},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Fujimori2018,

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 = {Eiji Fujimori and Suzuka Nagata and Hidetoshi Kumata and Tomonari Umemura},

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

year  = {2018},

date = {2018-09-14},

journal = {Chemosphere},

volume = {214},

pages = {288-294},

abstract = {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{nokey,

title = {Seasonal Trends of Atmospheric PAHs in Five Asian Megacities and Source Detection Using Suitable Biomarkers},

author = {Saha, Mahua and Maharana, Dusmant and Kurumisawa, Rina amd Takada, Hideshige and Yeo, Bee Geok and Rodrigues, Andrea C. and Bhattacharya, Badal and Kumata, Hidetoshi and Okuda, Tomoaki and He, Kebin and Ma, Yongliang and Nakajima, Fumiyuki and Zakaria, Mohamad Pauzi and Giang, Duong Hoang and Viet, Pham Hung},

url = {https://aaqr.org/articles/aaqr-17-05-oa-0163},

doi = {10.4209/aaqr.2017.05.0163  },

issn = {1680-8584},

year  = {2017},

date = {2017-08-31},

urldate = {2017-08-31},

journal = {Aerosol and Air Quality Research},

volume = {17},

pages = {2247-2262},

abstract = {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 (C3017α)/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)-C30hopane (C3017β) and 17β21β (H)-C29hopane (C2917β) 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 = {Microplastics in Sediment Cores from Asia and Africa as Indicators of Temporal Trends in Plastic Pollution},

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

url = {https://link.springer.com/article/10.1007/s00244-017-0414-9},

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

year  = {2017},

date = {2017-05-22},

urldate = {2017-05-22},

issuetitle = {Indicators of Ocean Pollution},

journal = {Archives of Environmental Contamination and Toxicology},

volume = {73},

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 µm and 5 mm, most of which were in the range 315 µm–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{nokey,

title = {精密同位体分析　小型加速器質量分析装置の進歩と環境・地球化学研究への応用},

author = {内田, 昌男 and 熊田, 英峰},

editor = {日本分析化学会},

year  = {2016},

date = {2016-08-01},

urldate = {2016-08-01},

journal = {ぶんせき},

volume = {2016},

number = {8},

issue = {8},

pages = {310-317},

publisher = {日本分析化学会},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Chikamatsu2016,

title = {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},

author = {Kazuhiro Chikamatsu and Motohide Aoki and Tatsuya Uchida and Tomonari Umemura and Hidetoshi Kumata},

doi = {10.2116/bunsekikagaku.65.193},

year  = {2016},

date = {2016-01-01},

journal = {Bunseki Kagaku},

volume = {65},

number = {4},

pages = {193–202},

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 = {内田, 昌男 and 熊田, 英峰},

url = {https://www.jstage.jst.go.jp/article/jar/29/S1/29_s133/_article/-char/ja/},

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

year  = {2014},

date = {2014-02-20},

urldate = {2014-02-20},

issuetitle = {東アジアのエアロゾル・大気汚染物質の輸送と広域分布の解明},

journal = {エアロゾル研究},

volume = {29},

issue = {S1},

pages = {s133-s141},

abstract = {Atmospheric polycyclic aromatic hydrocarbons (PAHs), accounting for most (35–82%) of the total mutagenic activity of ambient aerosols, originate mostly from the incomplete combustion of carbon based fuels. Hence, reduction of PAHs emissions into the atmosphere is essential for effective air quality control, which requires reliable source apportionment. In certain situations molecular fingerprinting and/or stable carbon isotope ratios (δ13C) of individual PAHs can provide insight about the contributions from specific sources. Unfortunately, the broad utility of both approaches is limited to source apportionment between combustion sources. It is because deviations in source end-member values, arising both from carbon source variation and from differences in the conditions of PAHs formation, sometimes exceed differences between source end-member values. The 5730 year half-life of 14C makes it an ideal tracer for identifying combustion products derived from fossil fuels (14C-free; Δ14C＝－1000‰) versus those from modern biomass (contemporary 14C; Δ14C＞0‰). The recently developed preparative capillary gas chromatograph (PCGC) system and micro-scale 14C analysis by accelerator mass spectrometry (AMS) made compound specific radiocarbon analysis (CSRA) applicable to organic compounds existing in environmental samples. This review introduces recent progress in development of ultra micro-scale14C AMS analyses and compiles results from PAHs source apportionment studies using CSRA and/or compound class-specific radiocarbon analysis (CCSRA).},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{nokey,

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 = {Okuda, Tomoaki and Fujimori, Eiji and Hatoya, Kazuki and Takada, Hideshige and Kumata, Hidetoshi and Nakajima, Fumiyuki and Hatakeyama, Shiro and Uchida, Masao and Tanaka, Shigeru and He, Kevin and Ma, Yongliang and Haraguchi, Hiroki},

url = {https://link.springer.com/article/10.4209/aaqr.2012.11.0308},

doi = {10.4209/aaqr.2012.11.0308},

year  = {2013},

date = {2013-06-01},

urldate = {2013-06-01},

journal = {Aerosol and Air Quality Research},

volume = {13},

issue = {6},

pages = {1864-1876},

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.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{nokey,

title = {Inorganic Chemical Characterization of Aerosols in Four Asian Mega-Cities},

author = {Okuda, Tomoaki and Takada, Hideshige and Kumata, Hidetoshi and Nakajima, Fumiyuki and Hatakeyama, Shiro and Uchida, Masao and Tanaka, Shigeru and He, Kevin and Ma, Yongliang},

url = {https://link.springer.com/article/10.4209/aaqr.2012.09.0250},

doi = {10.4209/aaqr.2012.09.0250},

year  = {2013},

date = {2013-02-01},

urldate = {2013-02-01},

journal = {Aerosol and Air Quality Research},

volume = {13},

issue = {2},

pages = {436-449},

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.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{nokey,

title = {半揮発性有機化合物パッシブエアサンプラーの理論的背景},

author = {熊田, 英峰 },

year  = {2012},

date = {2012-11-05},

urldate = {2012-11-05},

journal = {ぶんせき},

volume = {455},

issue = {11},

pages = {652-653},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{nokey,

title = {Evaluation of Hydrogenated Resin Acids as Molecular Markers for Tire-wear Debris in Urban Environments},

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

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

doi = {10.1021/es202156f},

year  = {2011},

date = {2011-12-01},

urldate = {2011-12-01},

journal = {Environmental Science & 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{nokey,

title = {Chemical Sensing of Metal Ions Using a Silica-Micelle Mesophase Doubly Functionalized by a Fluorogenic Ionophore and a Masking Agent},

author = {Suto, Yasuo and Uchida, Tatsuya and Kumata, Hidetoshi and Tsuzuki, Mikio and Fujiwara, Kitao},

url = {https://link.springer.com/article/10.2116/analsci.27.673},

doi = {10.2116/analsci.27.673},

year  = {2011},

date = {2011-07-09},

urldate = {2011-07-09},

journal = {Analytical Sciences},

volume = {27},

pages = {673–674},

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.},

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},

url = {https://www.jstage.jst.go.jp/article/bunsekikagaku/59/11/59_11_1021/_article/-char/ja/},

doi = {10.2116/bunsekikagaku.59.1021},

year  = {2010},

date = {2010-07-20},

urldate = {2010-07-20},

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．},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{nokey,

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

url = {https://www.sciencedirect.com/science/article/abs/pii/S0168583X09011641},

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

year  = {2010},

date = {2010-04-01},

urldate = {2010-04-01},

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 μm (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.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{nokey,

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

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

url = {https://www.sciencedirect.com/science/article/abs/pii/S0168583X0901163X},

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

year  = {2010},

date = {2010-04-01},

urldate = {2010-04-01},

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.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{nokey,

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

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

url = {https://www.sciencedirect.com/science/article/abs/pii/S016980950800094X},

doi = {10.1016/j.atmosres.2008.04.005},

year  = {2008},

date = {2008-10-01},

urldate = {2008-10-01},

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.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{nokey,

title = {気候変動と高緯度北極土壌圏—土壌有機炭素リザーバーへの温暖化影響—},

author = {内田, 昌男 and 内田, 雅己 and 熊田, 英峰 and 高橋, 善幸 and 大塚, 俊之 and 内海, 真生 and 近藤, 美由紀 and 中坪, 孝之 and 柴田, 康行},

issn = {0387-3498},

year  = {2008},

date = {2008-07-01},

urldate = {2008-07-01},

issuetitle = {北半球高緯度海域における気候変動研究-III －近未来温暖化影響予測に向けた最新の知見－},

journal = {月刊地球},

volume = {30},

issue = {5},

pages = {216-229},

abstract = {北極・高緯度域土壌には、温室効果ガスを含む永久凍土層とともに、地質時代から蓄積されてきた有機炭素が大量に存在している。温暖化は、これらの気候変動に脆弱な炭素リザーバーを容易に不安定化させることが懸念されている。本研究では、北極スピッツベルゲン島ニーオルスン氷河後退域における土壌有機炭素の分解に関する温暖化影響を調べるため、氷河末端から海岸へと至るおよそ2.6 kmのトランセクト調査ラインを設定し、放射性炭素、安定同位体比分析に基づく土壌有機炭素のキャラクタリゼーションを行った。その結果、表層0-1 cm深の土壌有機炭素の放射性炭素年代は、800年〜34510年とfossil organic carbonの割合が多いことが認められ、さらに、土壌内CO2の放射性炭素年代も2800〜7060年と古いことから、土壌中でのfossil organic carbonの分解を示唆するものであった。},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{nokey,

title = {最終氷期・最終退氷期のブラックカーボンとPAHの堆積履歴},

author = {熊田, 英峰 and 内田, 昌男},

year  = {2008},

date = {2008-06-01},

urldate = {2008-06-01},

issuetitle = {北半球高緯度海域における気候変動研究-II －近未来温暖化影響予測に向けた最新の知見－},

journal = {月刊地球},

volume = {30},

issue = {4},

pages = {198-204},

abstract = {海底に埋積するブラックカーボン（BC）は、燃焼過程に由来する煤状BC（soot）と燃焼によらず地質過程で生成されるグラファイト様BC（GBC）とに大別できる。最終氷期・最終退氷期のBCとPAHの堆積履歴から、最終氷期最盛期（LGM）の末期を堺にしてこれら2種類のBCの寄与が大きく変化した可能性が浮かびあがってきた。},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{nokey,

title = {Sorptive Behavior of Nitro-PAHs in Street Runoff and Their Potential as Indicators of Diesel Vehicle Exhaust Particles},

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

url = {https://pubs.acs.org/doi/10.1021/es071904o},

doi = {10.1021/es071904o},

year  = {2008},

date = {2008-02-15},

urldate = {2008-02-15},

journal = {Environmental Science & 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 µm) and from 2.3 to 4.9 ng/L in dissolved phase (<0.7 µm). 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 (105.8–6.3 for 2-nitrofluoranthene and 105.8–6.2 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 more than four for the 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 = {熊田, 英峰 and 兼保, 直樹 and KANG, Chang-Hee and 後藤, 優 and 内田, 達也 and 都筑, 幹夫 and 藤原, 祺多夫},

url = {https://www.jstage.jst.go.jp/article/chikyukagaku/41/4/41_KJ00008025767/_article/-char/ja/},

doi = {10.14934/chikyukagaku.41.135},

year  = {2007},

date = {2007-12-28},

urldate = {2007-12-28},

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{nokey,

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

author = {Kaneyasu, Naoki and Igarashi, Yasuhito and Sawa, Yousuke and Takahashi, Hiroshi and Takada, Hideshige and Kumata, Hidetoshi and Holler, Robert},

url = {https://agupubs.onlinelibrary.wiley.com/doi/full/10.1029/2007JD008544},

doi = {10.1029/2007JD008544},

year  = {2007},

date = {2007-07-16},

urldate = {2007-07-16},

journal = {Journal of Geophysical Research: Atmospheres},

volume = {112},

issue = {D13},

pages = {D13214},

abstract = {[1] 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 concurrent 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 O3 mixing ratios indicated a double-layered vertical structure in which a high O3 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.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{nokey,

title = {Correlations of Asthma Mortality With Traffic-Related Factors: Use of Catalytic Converters and Radial Tires},

author = {Dorsey, Thomas F. Jr and Lafleur, Arthur L. and Kumata, Hidetoshi and Takada, Hideshige and Herrero-Jimenez, Pablo and Thilly, William G.},

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

year  = {2006},

date = {2006-12-01},

urldate = {2006-12-01},

journal = {Journal of Occupational and Environmental Medicine},

volume = {48},

issue = {12},

pages = {1321-1327},

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.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{nokey,

title = {Compound Class Specific 14C Analysis of Polycyclic Aromatic Hydrocarbons Associated with PM10 and PM1.1 Aerosols from Residential Areas of Suburban Tokyo},

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

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

doi = {10.1021/es052407f},

year  = {2006},

date = {2006-06-01},

urldate = {2006-06-01},

journal = {Environmental Science & Technology},

volume = {40},

issue = {11},

pages = {3474–3480},

abstract = {Compound class specific radiocarbon analysis (CCSRA) was performed for polycyclic aromatic hydrocarbons (PAHs) associated with airborne particulate matter (APM) with diameter <10 μm (PM10) and <1.1 μm (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 Δ14C−PAHs in APM, ranging from −787 to −514‰, indicated dominance of fossil fuel combustion. The Δ14C of 5−6 rings (HMW) PAHs were higher than the 3−4 rings (LMW) species in both PM10 and PM1.1 samples. The Δ14C of HMW−PAHs indicated greater biomass-burning contributions in summer than in winter and no apparent particle-size variation. Conversely, the Δ14C 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 = {Flow injection analysis to measure the production ability of superoxide with chemiluminescence detection in natural waters},

author = {Fujiwara, Kitao and Kumata, Hidetoshi and Kando, Naoko and Sakuma, Eisuke and Aihara, Makoto and Morita, Yasutaka and Miyakawa, Tsuyoshi},

url = {https://www.tandfonline.com/doi/full/10.1080/03067310500352312},

doi = {10.1080/03067310500352312},

isbn = {0306-7319},

year  = {2006},

date = {2006-04-20},

urldate = {2006-04-20},

journal = {International Journal of Environmental Analytical Chemistry},

volume = {86},

issue = {5},

pages = {337-346},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{nokey,

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

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

url = {https://www.jstage.jst.go.jp/article/geochemj1966/38/1/38_1_89/_article/-char/ja/},

doi = {10.2343/geochemj.38.89},

year  = {2004},

date = {2004-02-20},

urldate = {2004-02-20},

volume = {38},

issue = {1},

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 μg g-1-TSP) at S1, S2 and S3. Compound-specific δ13C 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 δ13C 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 contribution 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 δ13C of individual PAHs at each site. The estimated average δ13C values of individual PAHs derived from automobiles, which was calculated 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 δ13C value of PAHs derived from non-vehicle sources. We estimated that the automotive contribution to the concentration of individual PAHs ranged from 33 to 88% at S1, from 11 to 74% at S2, and from 0 to 52% at S3. We conclude that compound-specific δ13C measurement is a powerful and useful tool to identify such compound-specific sources of atmospheric 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 = {長南, 学 and 熊田, 英峰 and 村上 陽子, and 藤原, 祺多夫},

url = {https://www.jstage.jst.go.jp/article/jswe/27/4/27_4_273/_article/-char/ja/},

doi = {10.2965/jswe.27.273},

issn = {1881-3690},

year  = {2004},

date = {2004-01-22},

urldate = {2004-01-22},

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 compounds in the Tamagawa river, Japan and the photoinduced decrease in their concentration in water and on the tidal flat. The concentrations of NP and OP in the dissolved from (<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 experiment’ 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 concentrations and water salinity. These results suggest that alkylphenols are removed from the water column through a process other than flocculation. Irradiated for 8 hours using a solar simulator, the concentration of NP and OP dissolved in 1 mg·l-1 humic acid solution decreased significantly (-50%), whereas those in distilled water behaved more conservatively, this suggests that the photolytic decomposition of NP and OP can occur in natural waters. Although small, but significant amounts of alkylphenols were removed from a river sediment after a 6-hour exposure to sunlight, the anoxic production of NP and OP from their precursors in the sediment was revealed to be a far more important process than the photolytic decomposition.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{nokey,

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

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

url = {https://www.sciencedirect.com/science/article/pii/S0146638002001808},

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

year  = {2002},

date = {2002-12-01},

urldate = {2002-12-01},

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.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{nokey,

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

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

url = {https://onlinelibrary.wiley.com/doi/abs/10.1002/aoc.328},

doi = {10.1002/aoc.328Digital Object Identifier (DOI)},

year  = {2002},

date = {2002-07-08},

urldate = {2002-07-08},

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-1α 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.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{nokey,

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

author = {Sakurai, Teruaki and Ochiai, Masayuki and Kojima, Chikara and Kumata, Hidetoshi and Fujiwara, Kitao},

url = {https://onlinelibrary.wiley.com/doi/10.1002/aoc.324},

doi = {10.1002/aoc.324},

year  = {2002},

date = {2002-07-08},

urldate = {2002-07-08},

journal = {Applied Organometallic Chemistry},

volume = {16},

issue = {8},

pages = {415-420},

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.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{nokey,

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

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

url = {https://www.sciencedirect.com/science/article/pii/S0146638002000311},

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

year  = {2002},

date = {2002-07-01},

urldate = {2002-07-01},

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, P=0.19) between ΣPAH and δ13C throughout the core. PAHs in surface sediment (ca 0–8 cm) were characterised by a significantly higher benzo(ghi)perylene to indeno(1,2,3-cd)pyrene ratio (t-test, P<0.025) and heavier δ13C values (P<0.015) than lower sections in the core. This suggests that PAHs sedimented after 1990 were more strongly influenced by PAHs from automotive exhausts. This preliminary study suggests that a two-dimensional analysis of both the molecular and isotopic compositions of PAHs may be useful in obtaining a more detailed source identification of organic pollutants in environmental samples.},

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

url = {https://www.jstage.jst.go.jp/article/jec1991/12/3/12_3_621/_article/-char/ja/},

doi = {10.5985/jec.12.621},

issn = {1882-5818},

year  = {2002},

date = {2002-05-27},

urldate = {2002-05-27},

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{nokey,

title = {Distribution of Polycyclic Aromatic Hydrocarbons (PAHs) in Rivers and Estuaries in Malaysia:  A Widespread Input of Petrogenic PAHs},

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

url = {https://pubs.acs.org/doi/10.1021/es011278+},

doi = {10.1021/es011278+},

year  = {2002},

date = {2002-05-01},

urldate = {2002-05-01},

journal = {Environmental Science & 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 concentra tions 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{nokey,

title = {弱酸性—中性領域で起こるルミノール−過酸化水素−遷移金属錯体不均一系での化学発光現象},

author = {熊田, 英峰},

year  = {2002},

date = {2002-03-05},

urldate = {2002-03-05},

journal = {ぶんせき},

volume = {327},

issue = {3},

pages = {138-139},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{nokey,

title = {Benzothiazolamines as Tire-Derived Molecular Markers:  Sorptive Behavior in Street Runoff and Application to Source Apportioning},

author = {Kumata, Hidetoshi and Yamada, Junya and Masuda, Kouji and Takada, Hideshige and Sato, Yukio and Sakurai, Teruaki and Fujiwara, Kitao},

url = {https://pubs.acs.org/doi/10.1021/es0155229},

doi = {10.1021/es0155229},

year  = {2002},

date = {2002-02-15},

urldate = {2002-02-15},

journal = {Environmental Science & Technology},

volume = {36},

issue = {4},

pages = {702-708},

abstract = {Wash-off and sorptive behaviors of two benzothiazolamines (BTs) [i.e., 2-(4-morpholinyl)benzothiazole (24MoBT) and N-cyclohexyl-2-benzothiazolamine (NCBA)] have been investigated as possible molecular markers for tire debris and/or road dust transported in highway runoff water. Sum of dissolved and particulate 24MoBT and NCBA concentra tions in runoff water ranged from 15 to 417ng/L and from 22 to 508ng/L, respectively. Proportions of NCBA in particulate (>0.7μm) phase (<9−79%) were larger than that of 24MoBT (<1−14%), which was consistent with their experimentally determined octanol/water partition coefficients (Kow; 104.23±0.14 for NCBA; 102.42±0.03 for 24MoBT). The organic carbon-normalized in-situ partition coefficient (Koc‘) observed in runoff events (104.69±0.28 for NCBA; 103.42±0.23 for 24MoBT) were 1 order of magnitude higher than those expected from their Kow, indicating strong affinity of BTs to suspended particulate matter (SPM) in runoff water. Furthermore, in desorption experiments lasting 24 h, we observed almost the same levels of Koc‘ as those in runoff events, implying that significant fractions of BTs are strongly associated with runoff particles and not easily available to equilibrium partitioning. NCBA was ubiquitous in sediments from the Nogawa River receiving runoff from the Chuo Highway, whereas many of those samples had undetectable levels of 24MoBT. All of above results indicate that NCBA would be more suitable than 24MoBT as a molecular marker for runoff particles loading the aquatic environment. By using SPM-weighted mean concentration of particulate NCBA, at least 3.3 ± 1.6% of the mass in the Nogawa sediments is estimated to be from runoff SPM.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{nokey,

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

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

url = {https://www.sciencedirect.com/science/article/abs/pii/S1352231001005064},

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

year  = {2002},

date = {2002-02-01},

urldate = {2002-02-01},

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.},

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

url = {https://www.jstage.jst.go.jp/article/jar/15/4/15_4_313/_article/-char/ja/},

doi = {10.11203/jar.15.313},

year  = {2000},

date = {2000-12-20},

urldate = {2000-12-20},

journal = {エアロゾル研究},

volume = {15},

issue = {4},

pages = {313-320},

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

url = {https://www.jstage.jst.go.jp/article/rog/15/0/15_KJ00005930491/_article/-char/ja/},

doi = {10.20612/rog.15.0_13},

year  = {2000},

date = {2000-06-30},

urldate = {2000-06-30},

journal = {Researches in Organic Geochemistry},

volume = {15},

pages = {13-25},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{nokey,

title = {Water-Particle Distribution of Hydrophobic Micro Pollutants in Storm Water Runoff},

author = {Kumata, Hidetoshi and Masuda, Kouji and Yamada, Junya and Takada, Hideshige},

url = {https://www.tandfonline.com/doi/abs/10.1080/10406630008034774},

doi = {10.1080/10406630008034774},

year  = {2000},

date = {2000-06-01},

urldate = {2000-06-01},

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 with 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 wirh 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{nokey,

title = {Historical Trends of N-Cyclohexyl-2-benzothiazolamine, 2-(4-Morpholinyl)benzothiazole, and Other Anthropogenic Contaminants in the Urban Reservoir Sediment Core},

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

url = {https://pubs.acs.org/doi/full/10.1021/es990738k},

doi = {10.1021/es990738k},

year  = {2000},

date = {2000-01-15},

urldate = {2000-01-15},

journal = {Environmental Science & Technology},

volume = {34},

issue = {2},

pages = {246-253},

abstract = {A new potential molecular marker, N-cyclohexyl-2-benzothiazolamine (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 (∼ng/g to ∼μg/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 but lower in the middle parts (6−16 cm depth). Dating of the core by using 137Cs 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 ∑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 contamina tion.},

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

url = {https://www.jstage.jst.go.jp/article/chikyukagaku/33/2/33_KJ00007318942/_article/-char/ja/},

doi = {10.14934/chikyukagaku.33.123},

year  = {1999},

date = {1999-06-01},

urldate = {1999-06-01},

journal = {地球化学},

volume = {33},

issue = {2},

pages = {123-138},

abstract = {To estimate the sedimentation rate and to understand the sedimentation processes in Tokyo Bay, vertical distributions of 210Pb and 137Cs were determined for two sediment cores (F-2 and F-5) from Tokyo Bay and one from the moat of Imperial Palace for the Tokyo. Molecular stratigraphy was applied to one of the Tokyo Bay sediment cores using polychlorinated biphenyls (PCBs) and linear and tetrapropylene-based alkylbenzenes (LABs and TABs). 210Pb showed exponential downcore decrease with substantial fluctuation. In the sediment core of the bay (F-2), radiocesium maximum, corresponding to the atmospheric deposition maximum at 1963, was observed. Good agreement between the deposition date estimated using radionuclides (137Cs and 210Pb) and the vertical distributions of PCBs, LABs and TABs, suggests the utility of multiple markers approach for sediment stratigraphy. In the Tokyo Bay sediments, only slight or negligible decrease in 137Cs activity was observed toward the surface layer where significant amounts of 137Cs was detected, whereas a sharp peak of 137Cs were observed for the Moat which has no inflowing rivers. PCBs and TABs, whose productions and usage ceased by early 1970s, decreased gradually to the sediment-water interface in the Tokyo Bay and were found significantly in the surficial sediments. All these markers suggest that riverine and estuarine sediments play a role of a reservoir of the pollutants, that is, particle-reactive pollutants are temporally deposited and stored in riverine and estuarine sediments which are intermittently supplied to Tokyo Bay during flood events with resuspension.},

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

url = {https://www.jstage.jst.go.jp/article/bunsekikagaku1952/48/6/48_6_535/_article/-char/ja},

doi = {10.2116/bunsekikagaku.48.535},

year  = {1999},

date = {1999-03-31},

urldate = {1999-03-31},

journal = {分析化学},

volume = {48},

issue = {6},

pages = {535-547},

abstract = {環境試料中に含まれる多種多様な環境ホルモンを包括的に分析する方法を開発した.検討試料としては堆積物を用い,アルキルフェノール類,フタル酸エステル類,ビスフェノールA,多環芳香族炭化水素類,コプラナーPCB類,DDT類を測定対象とした.試料中の各成分は有機溶媒により抽出し,2種のシリカゲルカラム及び活性炭カラムにより精製・分離し,各画分をGC/MSもしくはGC-ECDで測定した.測定結果よりきょう雑物の影響もなく,ほぼすべての成分について回収率及び再現性も良好であった.本法の有用性を明らかにするために,東京湾で採取された堆積物2g(乾燥重量)を本法を用いて分析した.その結果上記の成分が乾燥重量当たり数百pg/gから百数十ng/gの範囲で検出され,本法が量的制限のある試料の分析に有用であることが確認された.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{nokey,

title = {Determination of 2-(4-morpholinyl) benzothiazole in environmental samples by a gas chromatograph equipped with a flame photometric detector},

author = {Kumata, Hidetoshi and Takada, Hideshige and Ogura, Norio},

url = {https://pubs.acs.org/doi/full/10.1021/ac9511556},

doi = {10.1021/ac9511556},

year  = {1996},

date = {1996-06-01},

urldate = {1996-06-01},

journal = {Analytical Chemistry},

volume = {68},

issue = {11},

pages = {1976-1981},

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}

}