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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A 0.1 g portion of waste oil is cleaned up by silica gel chromatography followed by dimethylformamidehexane partitioning and chromatography on a de-activated neutral alumina column. The purified extract is examined for PCBs by either packed-column or capillary-column gas chromatography using either electon-capture or Hall electrolytic conductivity detectors. Recoveries at the 10 mg kg-1 level are in the range 66-98% and the coefficient of variation is typically 12%. A reporting limit of 5 mg kg-l is readily attainable and PCBs can be detected down to about 1 mg kg-1.

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