A ten-year study of chlorinated hydrocarbon insecticide residues in bovine milk in Illinois, 1972 - 1981.
Milk supplies in Illinois were monitored for chlorinated hydrocarbon insecticide residues from 1972 through 1981. The percentage of milk samples that were contaminated with aldrin/dieldrin, DDT and its analogs, and BHC/lindane decreased during the 10-year sampling period. The percentage of samples contaminated with aldrin/dieldrin decreased from 98.7% in 1978 to 5.9% in 1981. The amount of aldrin/dieldrin residues found in contaminated samples also decreased from an average of 0.077 ppm (1972-79) to 0.001 ppm in 1980-81. The levels of chlordane and heptachlor/heptachlor epoxide residues in milk did not decrease, but residues of BHC and DDT decreased gradually over the 10-year period. The percentage of samples that had less than 0.1 ppm of all chlorinated hydrocarbon residues combined ranged from 10.6% to 25.7% during 1972 through 1978 and increased to 36.2% in 1979, 71.1% in 1980, and 61.4% in 1981.
D000818:Animals; D002417:Cattle; D002849:Chromatography, Gas; D006843:Hydrocarbons, Chlorinated / Q000032:analysis*; D007087:Illinois; D007306:Insecticides / Q000032:analysis*; D008892:Milk / Q000032:analysis*; D010573:Pesticide Residues / Q000032:analysis*
D006843:Hydrocarbons, Chlorinated; D007306:Insecticides; D010573:Pesticide Residues