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A comparative study of chlorinated hydrocarbon pesticide residues in 40 human milk samples derived from an urban area (Brisbane) and a rural area (Mareeba) has been described. Relatively high concentrations of DDT and metabolites, dieldrin, and hexachlorobenzene (HCB) residues were detected in the samples from both areas. Dieldrin concentrations were abnormally high in comparison with other reported surveys. Statistically significant differences for total DDT and HCB residues were found to exist between the urban and rural areas, but dieldrin residues showed no significant difference. The calculated average daily intake of total DDT, dieldrin and HCB residues by breast-fed babies in both areas exceeded the relevant acceptable daily intakes recommended by the FAO/WHO. Furthermore, recommended N.H.M.R.C. tolerances for cows' milk were exceeded by total DDT, dieldrin and HCB residues.
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Miller et al. (1973) studied this question.
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