Abstract
In order to analyse polychlorinated terphenyls (PCTs) in food wrappers rapidly, separation of PCTs from polychlorinated biphenyls (PCBs) by reverse-phase partition thin-layer chromatography (RPP-TLC) was investigated, and the method was applied to the detection of PCTs in food wrappers. The components of PCTs and PCBs were resolved on liguid paraffin layers by development with acetonitrile-acetone solvent systems, and the materials examined showed characteristic patterns composed of slightly overlapping spots. Respective perchlorinated compounds of PCTs and PCBs, o-, m-, and p-tetradecachloroterphenyls (TDCTs) and decachlorobiphenyl were also distinctly separated as well-defined spots on the thin layers, and PCTs were identified in low levels in the presence of PCBs. PCTs in food wrappers were extracted with hexane and cleaned up by Florisil column chromatography. By submitting PCT fraction directly to RPP-TLC, their presence was assumed from the pattern obtained. After perchlorination of the fraction with antimony pentachloride and extraction with benzene, PCTs were comfirmed as TDCTs in high sensitivity by RPP-TLC.
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