Multiresidue Method for Quantitation of Organophosphorus Pesticides in Vegetable and Animal Foods

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Abstract
A critical review of multiresidue analytical methods was performed to develop an easy procedure that can be applied with slight modifications to vegetable and animal food samples. The multiresidue method described Is applicable to the quantitative determination of 28 organophosphorus pesticides In fatty as well as nonfatty foods. The foods are divided Into 4 groups according to extraction process (acetone and acetone-water for samples with moisture content <45%) and cleanup (on active carbon- Cellte, on disposable mlnicolumns of Kieselguhr- type material, and on disposable mlnicolumns of bonded-phase silica, according to fat and pigment content). A further fractionation on silica-gel microcolumns can be Included In the procedure. A wide-bore column (SPB-5) with flame photometric detection operated in phosphorus mode (FPD-P) was chosen for gas chromatographic determination. Recoveries from apples, olive oil, whole milk, pasta, and eggs are reported. Two packed columns (4% OV-101 and SP2250- SP2401) with FPD-P were tested as confirmation columns. The method is suitable for a total diet study.

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