The feasibility of analysing #x2264;5 ml blood and 1 ml monkey milk samples for polychlorinated biphenyls (PCBs) was tested by fortification of similar size human blood and milk samples with Aroclor 1260 at the 1, 5, 10 and 10ng/g level, respectively. Recoveries were 71, 82 and 89 for blood and 95 for milk. Recoveries of 90 were obtained, when 100 mg samples of monkey liver, kidney and adipose tissue were fortified with Aroclor 1254 at the 0.2, 0.5 and #x3BC;g/g level. The methodology was then applied to blood, collected from monkeys receiving Aroclor 1254 at definite intervals of dosing. The initial PCB level rose from 2.2 to 4.5ng/g after 120 days. Monkey milk analysed at different days of lactation showed little variation in the PCB content on a whole milk basis. The peak height ratios varied among the substrates and with those of standard Aroclor 1254.
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