Determination of organophosphorus insecticides residues in dry cabbages by ultrasonic extraction-gas chromatography

In order to detect familiar organophosphorus insecticides residues more accurately and more conveniently,a detection method was established for the determination of 12 organophosphorus insecticides residues in dry cabbages by ultrasonic extraction-gas chromatography,including dichlorvos,methamidophos,acephate,phorate,omethoate,dimethoate,chlorpyrifos,parathion-methyl,fenitrothion,isofenphos-methyl,parathion and isocarbophos.The results showed that the 12 organophosphorus insecticides concentration range of linearity was 0.01~1.00 μg/mL.The percent recoveries were 70.6%~112.1%,coefficients of variation(CV) were 1.6%~15.2%,and the detection limits were 0.004~0.026 mg/kg.Some samples collected from market were determined by this method system.It was found that the residue was 0.243 mg/kg for chlorpyrifos with 1.7% of CV,and the other 11 organophosphorus insecticides were not found.This method was precise,high sensitivity and more convenient,and met the need of organophosphorus insecticides residues detection.