RAPID MULTIRESIDUE SCREENING METHOD FOR ORGANOPHOSPHATE PESTICIDES INVEGETABLES

A rapid and efficient multiresidue extraction procedure using ethyl ac etate and sodium sulfate has been applied to the analysis of diazinon, methamidophos, chlorpyrifos, malathion, parathion, parathion-methyl, dimethoate and monocrotophos residues in many different kinds of veget ables. No cleanup step was required Concentrated extracts were analyse d by gas chromatography with flame photometric detection in phosphorus mode. Recovery studies were performed in six kinds of matrices at two fortification levels. Recoveries were in the range 80-115%. The limit of quantification of the analytical method has been estimated as 0.01 ppm for diazinon, methamidophos and malathion, 0.03 ppm for chlorpyri fos, parathion, parathion-methyl and dimethoate and 0.1 ppm for monocr otophos. Experiments showed that potentially it should be possible to develop a rapid and universally applicable method for organophosphate pesticide residues in different matrices.