Congener-specific carbon isotopic analysis of technical PCB and PCN mixtures using Two-Dimensional Gas Chromatography-Isotope Ratio Mass Spectrometry.

Horii, Y., Kannan, K., Petrick, Gert, Gamo, T., Falandysz, J. and Yamashita, N. (2005) Congener-specific carbon isotopic analysis of technical PCB and PCN mixtures using Two-Dimensional Gas Chromatography-Isotope Ratio Mass Spectrometry. Environmental Science & Technology, 39 (11). pp. 4206-4212. DOI 10.1021/es050133q.

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Abstract

Analysis of stable carbon isotope fractionation is a useful method to study the sources and fate of anthropogenic organic contaminants such as polychlorinated biphenyls (PCBs) in the environment. To evaluate the utility of carbon isotopes, determination of isotopic ratios of 13C/12C in source materials, for example, technical PCB preparations, is needed. In this study, we determined δ13C values of 31 chlorobiphenyl (CB) congeners in 18 technical PCB preparations and 15 chloronaphthalene (CN) congeners in 6 polychlorinated naphthalene preparations using two-dimensional gas chromatography−combustion furnace−isotope ratio mass spectrometry (2DGC−C−IRMS). Development of 2DGC−IRMS enabled improved resolution and sensitivity of compound-specific carbon isotope analysis (CSIA) of CB or CN congeners. δ13C values of PCB congeners ranged from −34.4 (Delors) to −22.0‰ (Sovol). Analogous PCB preparations with similar chlorine content, but different geographical origin, had different δ13C values. PCB preparations from Eastern European countriesDelors, Sovol, Trichlorodiphenyl, and Chlorofenhad distinct δ13C values. PCB mixtures showed increased 13C depletion with increasing chlorine content. δ13C values for individual CB congeners varied depending on the degree of chlorination in technical mixtures. δ13C values of CN congeners in Halowaxes ranged from −26.3 to −21.7‰ and these values are within the ranges observed for PCBs. This study establishes the range of δ13C values in technical PCB and PCN preparations, which may prove to be useful in the determination of sources of these compounds in the environment. This is the first study to employ 2DGC−IRMS analysis of δ13C values in technical PCB and PCN preparations

Document Type: Article
Keywords: Congener-Specific, Carbon Isotopic Analysis, Technical PCB, PCN, Mixtures, Two-Dimensional Gas Chromatography, Isotope Ratio Mass Spectrometry
Research affiliation: OceanRep > GEOMAR > FB2 Marine Biogeochemistry > FB2-CH Chemical Oceanography
Refereed: Yes
Open Access Journal?: No
DOI etc.: 10.1021/es050133q
ISSN: 0013-936X
Date Deposited: 16 Jan 2009 10:02
Last Modified: 07 Mar 2017 09:34
URI: http://oceanrep.geomar.de/id/eprint/3421

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