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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21.
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