Determination of Organophosphorus Pesticides in Vegetables by Solid-Phase Extraction Cleanup and Gas Chromatography
Chai, Alvin Lian Kuet and Lau, Seng (2003) Determination of Organophosphorus Pesticides in Vegetables by Solid-Phase Extraction Cleanup and Gas Chromatography. Pertanika Journal of Science & Technology, 11 (1). pp. 93-105. ISSN 0128-7680
A simple and rapid gas chromatography method has been developed for simultaneous determination of organophosphorus pesticides in vegetables. Residues are extracted with acetone and dichloromethane. Extracts are cleaned up by a mixed-mode solid-phase extraction column, quaternary amine and aminopropyl silane. The pesticides are determined by gas chromatography using a flame photometric detector. The recoveries for 9 pesticides in three vegetables: carrot, cucumber and green mustard, fortified at 0.5 mg/kg were in the range of 80.3% to 115.0%. Lower recoveries were obtained for methamidophos and dimethoate. The results were compared to the method currently used in the laboratory which does not include any cleanup.
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