Polychlorinated Biphenyls from Dairy Farms: Consequence in Market Milk

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Abstract
Samples of milk from bulk tanks of individual farms were collected from 198 producers and analyzed for polychlorinated biphenyl (PCB) residues. During 1st yr of the study these producers represented the entire milk supply for 1 processor. Detectable concentrations were in milk from 9 farms, which contributed 5% of milk delivered to the processor. Daily amount of PCB entering this milk market was 212 mg. During 2nd yr, samples were collected from the same producers. The compound was quantified in samples from 10 herds; 2 were undetectable the previous year. Concentrations in milk from other farms had declined significantly from previous year, contributing less than 1/3 calculated amount to market milk.