Determination of Tebufenozide,Aldicarb,Aldicarb sulfoxide andAldicarb sulfone in Scallion Using Dispersive Solid Phase Extraction Liquid Chromatography-Tandem Mass Spectrometry

KeyWord:dispersive solid phase extraction£¨DSPE)  liquid chromatography-tandem mass spectrometry£¨LC-MS/MS)  multi reaction monitoring£¨MRM)  pesticide residues  scallion

Abstract:

      A liquid chromatography-tandem mass spectrometric£¨LC-MS/MS) method was established for the determination of tebufenozide,aldicarb,aldicarb sulfoxide and aldicarb sulfone in scallion.The samples were extracted with acetonitrile and ethyl acetate,respectively.It was found that the extraction efficiencies of 4 pesticides with acetonitrile were better than those with ethyl acetate.Co extractives were removed from the acetonitrile extracts using dispersive solid phase extraction£¨DSPE).The calibration curves were linear in the range of 10-120 ¦Ìg/L with correlation coefficients£¨r2) more than 0.995.The limits of quantitation£¨LOQs)of 4 pesticides were all less than 10 ¦Ìg?kg-1,and the average recoveries at the spiked level of 10 ¦Ìg?kg-1 in scallion samples ranged from 60% to 110% with RSDs less than 5.0%.The results showed that this method was rapid,sensitive and specific,and was appropriate for the simultaneous identification and quantification of 4 pesticides in scallion.