Determination of organophosphorus pesticide multi-residues in vegetables and fruits by capillary gas chromatography

Objective:To establish a method for rapid determination of 21 organophosphorus pesticide residues in vegetables and fruits by capillary gas chromatography at the same time.Methods:The sample was stirred into homogenate and extracted by acetonitrile.After the extract was concentrated,the residues were dissolved to constant volume with acetone and injected into capillary gas chromatography with Rtx-1701 and flame photometric detector for qualification and quantification.Results:The pesticides were separated from each other very well within 29 minutes.Good linearities were obtained.The recovery rates of two levels in beans,Chinese cabbages and pears were from 80.4% to 93.4% and the relative standard derivation was from 2.6% to 9.9%.The minimum detection concentration was from 0.003 to 0.032 mg/kg.Conclusion:This method is simple,rapid,accurate and reliable.It can be applied to determine the organophosphorus pesticide multi-residues in vegetables and fruits.