Comparison of Ten Methods for the Analysis of Milk for Residues of Chlorinated Pesticides

Abstract

Abstract Ten methods for the analysis of milk for residues of chlorinated pesticides were used to analyze a sample of milk containing a residue of heptachlor epoxide and fortified with p,p’-TDE, 1.00 p pm fat basis. Based on the p,p’-TDE determined, average recoveries above 90% were obtained with six methods, and 89, 85, 79, and 56% recoveries, respectively, with four methods. Cleanup efficiency for determination by electron capture GLC and thin layer chromatography varied from good to poor.