Determination of Organophosphorus Pesticides Residues in Vegetables by Rapid GC-MS Coupled with Direct Single-drop Microextraction

KeyWord:direct single-drop microextraction  organophosphorus  rapid  gas chromatography-mass spectrometry(GC-MS)  vegetables

Abstract:

      A rapid method was developed for the determination of organophosphorus pesticides residues in vegetables using GC-MS coupled with direct single drop microextraction(SDME).The samples were extracted and enriched by direct SDME,then the target compounds were analyzed by GC-MS under selected ion monitering(SIM) mode,and quantified by the internal standard.Under the optimized conditions,9 kinds of organophosphorus pesticides,including sulfotep,phorate,iprobenfos,methyl parathion,ronnel,malathion,chlorpyrifos,isocarbophos and quinalphos,were successfully separated.The correlation coefficients were not less than 0.995 8,and the detection limits ranged from 0.32 ¦Ìg/kg to 0.91 ¦Ìg/kg.The recoveries were in the range of 83.2%-134ª±5% with RSDs(n=5) of 3.4%-16.5%.The developed method was simple,rapid and sensitive,and could be applied in the determination of 9 kinds of organophosphorus pesticides residues in vegetables.