Insecticide residues in human milk from Arkansas and Mississippi, 1973-74.

Between September 1973 and February 1974, 57 samples of human milk were collected from women residing in selected areas of Arkansas and Mississippi. Residues of p.p'-DDT, p.p'-DDE, p.p'-TDE, beta-BHC, dieldrin, heptachlor epoxide, oxychlordane, and trans-nonachlor were measured by electroncapture gas chromatography; trace amounts of o,p'-DDT and polychlorinated biphenyls were also detected. Additional analytical procedures were employed to confirm the presence of specific residues.