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A method for determining residues of biphenyl, benomyl, carbendazim, 2phenylphenol and thiabendazole is presented. Samples are extracted by refluxing with dilute hydrochloric acid, the biphenyl and 2-phenylphenol being steam distilled and collected for determination separately. Benomyl is converted into carbendazim and both carbendazim and thiabendazole are separated from interfering co-extractives by partitioning with chloroform under acidic and basic conditions. Thiophanate-methyl can also be determined after conversion into carbendazim but the conversion is not quantitative, The fungicides are determined by high-performance liquid chromatography using an ultraviolet spectrophotometric detector.

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1 The concentrations of some organochlorine pesticides and polychlorobiphenyls have been determined in 193 samples of human milk collected between July 1989 and July 1991. 2 Comparison of the results with those from previous studies in 1979-80, and earlier, shows a continuing decline in residue levels except for polychlorobiphenyls. 3 The concentrations of organochlorine pesticides and polychlorobiphenyls in human milk samples from resi dents in the United Kingdom compare favourably with data obtained in other countries.

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