Determination of Multi-residues of Organophosphorus Pesticides in Vegetables by Capillary Gas Chromatography

[Objective]To establish the a method for simultaneous determination of 8 oganophosphorus pesticides residues in vegetables by capillary gas chromatography[Methods]The sample was stirred into homogenate and extracted by acetonitrile. After concentrate drying,the residues were dissolved to constant volume with acetone,and injected into gas chromatography with Rtx-1 capillary column and GC FPD for qualification and quantification.[Results] The 8 kinds organic phosphorus pesticide were well separated. The retention time was 3.411~11.634 min. Good linear relationship was obtained by quantitative analysis. All correlation coefficients were more than 0.99. The recovery rates of 3 levels in beans and tomatoes were 80.0% ~ 95.0%,RSD was 2.1% ~ 10.6%. The minimum detection concentration was 0.01~ 0.03 mg/kg which met the health standards.[Conclusion]This method is simple,with good accuracy,precision and low cost,which is suitable for determination of multi-residues of organophosphorus pesticides in vegetables.