Simultaneous Determination of 40 Organophosphorus Pesticides in Tea by Online GPC/GC-MS/MS with Multi-walled Carbon Nanotubes as Dispersive Solid Phase Extraction Sorbent

KeyWord:multi-walled carbon nanotubes(MWCNTs)  online gel permeation chromatography/gas chromatography-tandem mass spectrometer(GPC/GC-MS/MS)  organophosphorus  tea

Abstract:

      A method was developed for the determination of 40 organohosphorus pesticides in tea by online gel permeation chromatography/gas chromatography-tandem mass spectrometry(GPC/GC-MS/MS) using multi-walled carbon nanotubes(MWCNTs) as dispersive solid phase extraction(DSPE) sorbent in sample pretreatment.Pesticides residues in tea were extracted with acetonitrile,and cleaned up with MWCNTs.The target compounds were analyzed by the online GPC/GC-MS/MS.The recoveries at three spiked concentration levels of 20,50,150 ¦Ìg/kg were in the range of 84.2%-109.9% with relative standard deviations(RSDs,n=6) not more than 8.9%.The limits of detection(LODs) were in the range of 0.5-4.6 ¦Ìg/kg.This method is simple,rapid and sensitive,and could meet the requirements for pesticides analysis.