Congener-Specific Carbon Isotopic Analysis of Technical PCB and PCN Mixtures Using Two-Dimensional Gas Chromatography-Isotope Ratio Mass Spectrometry
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- 作者：Yuichi Horii ; Kurunthachalam Kannan ; Gert Petrick ; Toshitaka Gamo ; Jerzy Falandysz ; and Nobuyoshi Yamashita
- 刊名：Environmental Science & Technology
- 出版年：2005
- 出版时间：June 1, 2005
- 年：2005
- 卷：39
- 期：11
- 页码：4206 - 4212
- 全文大小：183K
- 年卷期：v.39,no.11(June 1, 2005)
- ISSN：1520-5851
文摘
Analysis of stable carbon isotope fractionation is a usefulmethod to study the sources and fate of anthropogenicorganic contaminants such as polychlorinated biphenyls(PCBs) in the environment. To evaluate the utility of carbonisotopes, determination of isotopic ratios of 13C/12C insource materials, for example, technical PCB preparations,is needed. In this study, we determined 
13C values of31 chlorobiphenyl (CB) congeners in 18 technical PCBpreparations and 15 chloronaphthalene (CN) congeners in6 polychlorinated naphthalene preparations using two-dimensional gas chromatography-combustion furnace-isotope ratio mass spectrometry (2DGC-C-IRMS).Development of 2DGC-IRMS enabled improved resolutionand sensitivity of compound-specific carbon isotopeanalysis (CSIA) of CB or CN congeners. 13C values ofPCB congeners ranged from -34.4 (Delors) to -22.0”(Sovol). Analogous PCB preparations with similar chlorinecontent, but different geographical origin, had different13C values. PCB preparations from Eastern Europeancountries-Delors, Sovol, Trichlorodiphenyl, and Chlorofen-had distinct 13C values. PCB mixtures showed increased13C depletion with increasing chlorine content. 13Cvalues for individual CB congeners varied depending onthe degree of chlorination in technical mixtures. 13C valuesof CN congeners in Halowaxes ranged from -26.3 to-21.7” and these values are within the ranges observedfor PCBs. This study establishes the range of 13Cvalues in technical PCB and PCN preparations, whichmay prove to be useful in the determination of sources ofthese compounds in the environment. This is the firststudy to employ 2DGC-IRMS analysis of 13C values intechnical PCB and PCN preparations.
13C values of31 chlorobiphenyl (CB) congeners in 18 technical PCBpreparations and 15 chloronaphthalene (CN) congeners in6 polychlorinated naphthalene preparations using two-dimensional gas chromatography-combustion furnace-isotope ratio mass spectrometry (2DGC-C-IRMS).Development of 2DGC-IRMS enabled improved resolutionand sensitivity of compound-specific carbon isotopeanalysis (CSIA) of CB or CN congeners. 13C values ofPCB congeners ranged from -34.4 (Delors) to -22.0”(Sovol). Analogous PCB preparations with similar chlorinecontent, but different geographical origin, had different13C values. PCB preparations from Eastern Europeancountries-Delors, Sovol, Trichlorodiphenyl, and Chlorofen-had distinct 13C values. PCB mixtures showed increased13C depletion with increasing chlorine content. 13Cvalues for individual CB congeners varied depending onthe degree of chlorination in technical mixtures. 13C valuesof CN congeners in Halowaxes ranged from -26.3 to-21.7” and these values are within the ranges observedfor PCBs. This study establishes the range of 13Cvalues in technical PCB and PCN preparations, whichmay prove to be useful in the determination of sources ofthese compounds in the environment. This is the firststudy to employ 2DGC-IRMS analysis of 13C values intechnical PCB and PCN preparations.