Novel Method for Estimation of Chlorinated Pesticide Residues in Milk

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Abstract
A new, simple, and rapid procedure for determining chlorinated pesticide residues in milk is described. The entire acetonitrile extract from milk is passed through a 0.5 g activated charcoal chromatographic column. Chlorinated pesticides adsorbed on the charcoal are eluted with 100 mL acetone-hexane (1 + 1). The eluate is washed with water and 1% sodium carbonate solution, and chlorinated pesticides are extracted with hexane. The extract is concentrated and measured by electron capture gas chromatography. Recoveries from 50 mL milk samples fortified with 0.04-1.6 μg of different BHC isomers, 0.05-2 μg DDT and its metabolites, and 0.05-0.5 μg dieldrin ranged from 86.9 to 103.2%.

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