INVESTTIGATION OF EXTRACTION SOLVENTS TO INCREASE THE RECOVERY AND ELUTION OF PHOSPHORUS BASED PESTICIDES TO DETERMINE RESIDUES IN FRUITS AND VEGETABLES

Abstract

A simple and rapid method for the simultaneous determination of organophosphorus pesticide residues
(Thionazine, Sulfotep, Phorate, Disulfoton, Methyl parathion and Parathion) in fruits and vegetables was
established based on solid phase extraction and gas chromatography mass spectrometry. Pesticide residues
are extracted with acetone. The extract was purified by solid phase extraction (SPE) using a C18 column and
a hexane:acetone solvent system (5:1). The analytical recovery of organophosphorus pesticides
simultaneously determined by gas chromatography mass spectrometry was in the range of 72% to 94% with
an RSD <5%.