The residues of organochlorine compounds in yearly pooled human milk samples, which had been collected in the Tokyo Metropolitan area in 1979-1983, were evaluated by capillary gas chromatography using an electron capture detector (ECD/GC) and gas chromatography/mass spectrometry with packed columns.
The concentrations of these compounds determined by selected ion monitoring (SIM) were identical to those determined by capillary ECD/GC.
The concentrations on a whole milk basis (fat basis) by SIM were as follows: α-HCH, 0.10-0.31ppb (6-9ppb); β-HCH, 14.9-39.2ppb (837-1140ppb); γ-HCH, 0.10-0.16ppb (3-7ppb);
o,
p′-DDE, 0.06-0.11ppb (3ppb);
p,
p′-DDE, 18.2-56.4ppb (1020-1630ppb);
o,
p′-DDT, 0.11-0.41ppb (6-12ppb);
p,
p′-DDT, 2.22-7.86ppb (125-228ppb);
p,
p′-DDD, 0.03-0.10ppb (2-3ppb); HCB, 1.30-3.03ppb (73-93ppb), S-421 (a synergist for pyrethroid insecticides), 0.24-0.80ppb (10-23ppb); dieldrin, 0.36-1.55ppb (20-45ppb). However, no residues of δ-HCH and
o,
p′-DDD were detected (<0.01ppb on a whole milk basis). In addition, residues of chlordane-related compounds on a whole milk basis (fat basis) were determined to be as follows by SIM: oxychlordane, 0.36-0.60ppb (16-20ppb); heptachlor epoxide, 0.39-1.12ppb (22-33ppb);
trans-nonachlor, 0.80-0.91ppb (24-45ppb);
cis-nonachlor 0.13-0.16ppb (4-7ppb);
trans-chlordane, 0.01-0.02ppb (1ppb);
cis-chlordane, 0.02-0.03ppb (1ppb); compound 2 (dihydroheptachlor isomer), 0.03-0.04ppb (1-2ppb); compound 5 (chlordane isomer), 0.02-0.03ppb (1-2ppb); compound 6 (nonachlor isomer) 0.14-0.17ppb (5-8ppb).
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