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The separation of 140 chlorobiphenyl (CB) congeners from technical polychlorinated biphenyl (PCB) mixtures was investigated on five narrow-bore (0.22-0.25 mm I.D.) gas chromatography (GC) columns with stationary phases representing a broad range of polarity: dimethyl siloxane (0.15 micron SIL-5, 50 m), 5% diphenyl dimethyl siloxane (0.26 micron SIL-8, 50 m), 14% cyanopropyl phenyl 1% vinyl dimethyl siloxane (0.26 micron SIL-19, 50 m), bis-cyanopropyl phenyl siloxane (0.20 micron SIL-88, 50 m) and 1,2-dicarba-closo-dodecarborane dimethyl siloxane (0.1 micron HT-5, 25 m). Technical PCB mixtures (Aroclors) and authentic standards (totally 66 CBs) were injected on the narrow-bore columns and analysed by GC-ECD and GC-MS. Peak assignments were based on the experimental data together with published retention data and data on the quantitative composition of Aroclors. Structural principles for retention of CBs on polar stationary GC phases were developed. Surprisingly, the general performance of the classical column for PCB analysis, 5% diphenyl dimethyl siloxane, was slightly worse than that of the other tested columns, indicating that emphasis should be placed on these columns in the analysis of PCBs as single congeners.

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Authors: LARSEN B, JRC Ispra (IT);BOWADT S, JRC Ispra (IT);TILIO R, JRC Ispra (IT)
Bibliographic Reference: Article: International Journal of Environmental Analytical Chemistry, Vol. 47 (1992) pp. 47-68
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