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Simultaneous Determination of Selected Chlorinated Insecticide Residues in Milk

Robert A. Taft Sanitary Engineering Center, Cincinnati, Ohio

ABSTRACT

A simple, rapid, and effective method by which one technician can prepare a minimum of 60 milk samples per day is described. Recoveries of at least 94% with a standard deviation of not greater than 4.0% were obtained for heptachlor, heptachlor epoxide, DDT + DDE, dieldrin, and endrin. Simplicity, rapidity, and accuracy are enhanced by the elimination of unnecessary extract concentration and column chromatography cleanup and by the improved sample processing equipment.

This column will permit analysis of 40 milk samples per day per instrument, with a sensitivity well below actionable levels utilized in protection of the milk supply by the Food and Drug Administration (FDA).

The principal disadvantage of this method is that the insecticide lindane is decomposed by the alkaline treatment and cannot be measured. A minor disadvantage is the periodic conditioning required to maintain satisfactory column operation.