Congener-Specific Carbon Isotopic Analysis of 18 PCB Products Using Two Dimensional GC/IRMS

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  • HORII Yuichi
    Research Institute for Environmental Management Technology, National Institute of Advanced Industrial Science and Technology (AIST) Department of Science and Engineering, Ibaraki University
  • PETRICK Gert
    Leibniz Institute of Marine Sciences, Kiel University (IFM-GEOMAR)
  • OKADA Makoto
    Department of Science and Engineering, Ibaraki University
  • AMANO Kazuo
    Department of Science and Engineering, Ibaraki University
  • KATASE Takao
    Chemistry for Bioresource & Environment Graduate School of Bioresource Sciences, Nihon University
  • GAMO Toshitaka
    Ocean Research Institute, University of Tokyo
  • YAMASHITA Nobuyoshi
    Research Institute for Environmental Management Technology, National Institute of Advanced Industrial Science and Technology (AIST)

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Other Title
  • 二次元ガスクロマトグラフ／同位体比質量分析計を用いる１８種のポリ塩化ビフェニル製品の異性体別炭素同位体比分析
  • 2ジゲン ガスクロマトグラフ ドウイタイヒ シツリョウ ブンセキケイ オ モチイル 18シュ ノ ポリ エンカ ビフェニル セイヒン ノ イセイタイ ベツ タンソ ドウイタイヒ ブンセキ

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Description

In this study, we developed a new approach of compound-specific carbon isotopic analysis using a two-dimensional gas chromatograph (2DGC) with a combustion furnace (C) isotope ratio mass spectrometer (IRMS), and applied it for the “congener-specific” carbon isotopic analysis of polychlorinated biphenyls (PCBs). It was clarified that the 2DGC system enables a better separation of individual PCB congeners than a single column. Accurate values of δ13C were obtained for some congeners without co-elution. At the same time, a decrease of an undesirable organic carbon source from an impurity in the sample and column breed into the second column separation resulted in a significant improvement of detection limit. The estimated sensitivity of carbon using 2DGC/C/IRMS was less than 7 ng. Totally, thirty-one PCB congeners were measured in 18 PCB products: Kanechlors, Aroclors, Clophens, Phenoclors, Sovol, Trichlorodiphenyl including two PCB products from Eastern Europe (Delors, Chlorofen). Observed δ13C values of individual PCB congeners from 2DGC/C/IRMS ranged from −34.4 (CB180, Delor106) to −22.0‰ (CB70/76, Sovol). These values are comparable to δ13C value expected for industrial chemicals made of shell oil. However, we found a specific trend of a decrease in the isotope compositions according to increasing chlorine number in each PCB product. Increased chlorine number caused increased 13C depletion in all PCBs. It is worth mentioning that Delors and Chlorofen had a completly different range of δ13C values for other PCB products, and could be identified by isotopic compositions. The wide range of isotopic compositions between the PCB products and individual congeners may prove to be a powerful tool in the determining the source of PCBs in the environment. This technique may have wide applications in environmental chemistry.<br>

Journal

  • BUNSEKI KAGAKU

    BUNSEKI KAGAKU 54 (5), 361-372, 2005

    The Japan Society for Analytical Chemistry

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