Abstract: Acetonitrile-sodium chloride, trichloromethane and acetone-dichloromethane were used to extract organophosphorous pesticides respectively. Pulsed-flame photometer detector (PFPD) was used to analyze the extraction rate of these three solvents. Flame ionization detector (FID) was used to analyze the content of impurity in the samples extracted by those three solvents. An optional extraction and analysis method has been identified according to the analysis results with FID and PFPD. The organophosphorous pesticides in vegetables were extracted by acetonitrile-sodium chloride analyzed with PFPD. The limit of detection(LOD) of the four pesticides (dichlorvos, acephate, phorate and dimethoate) in this method was respectively 2.2, 43.0, 5.0, 2.3 ng/ml, the rate of recoveries were all between 95%～120%, and the intra-day RSD and inter-day RSD were all below 9. 5%. This method is easy to perform and has a high sensitivity.

Key words: organophosphorous pesticide, extraction methods, pulsed-flame photometer detector (PFPD), flame ionization detector (FID)