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  • Title: Determination of chlorinated pesticide residues in foods. I. Rapid screening method for chlorinated pesticides in milk.
    Author: Suzuki T, Ishikawa K, Sato N, Sakai KI.
    Journal: J Assoc Off Anal Chem; 1979 May; 62(3):681-4. PubMed ID: 479095.
    Abstract:
    A rapid analytical method for determining chlorinated pesticide residues in milk was developed. Thirteen pesticides were almost completely extracted. Ten mL samples of fortified milk were extracted 3 times with 20 mL portions of n-hexane as follows: (A) in the absence of water-soluble solvent; in the presence of (B) 1 mL acetonitrile; (C) 3 mL acetonitrile; (D) 5 mL acetonitrile; (E) 5 mL ethanol; (F) 5 mL acetonitrile and 1 mL ethanol. System F produced the highest pesticide recoveries but the lowest fat extraction, thus eliminating the necessity for liquid-liquid partitioning and minimizing Florisil column cleanup. Pesticide recoveries throughout the procedure were 94--103%. It was noticed, however, that the fat in high fat-containing raw milk is more readily extracted than that in commercial milk.
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