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377

DeterminationofPyrethroidsPesticidesMulti2residues

inTeabyGasChromatographyΠMassSpectrometry

LiYongjun,HuangZhiqiang,DaiHua,ZhangYing

(HunanEntry2ExitInspectionQuarantineBureauofthePeople′sRepublicofChina,Changsha410007)

3

Abstract　Anefficientmethodwithmicro2chemistryandsolidphaseextraction(SPE)techniqueforthe

determinationof6pyrethroidspesticideresiduesinteabygaschromatography2massspectrometry(GC2MS)hasbeenestablished.The6pyrethroidspesticideswereextractedfromthesamplewithhexaneΠacetone(1+1,V/V),theextractwascleanedupwithacolumnof3mLsupelcleanEnvi2carbandLC2Alumina2NbymeansofSPE(SUPELCOVISIPREPTM).The6pyrethroidspesticideswereseparatedfromeachotherthroughHP25caapillarycolumn(25m×0.2mm×0.33μm)anddeterminatedbyGC2MS.Therecoveriesrangedfrom84.6%to11511%.Whentheaddedlevelwas0.10～1.00mgΠkg,RSDwere3%～7%(n=5)andthelimitofdetectionwas0.01～0.2mgΠkg.Themethodisrapid,sensitiveandsuitablefortheanalysisofpesticides.Keywords　Pyrethroids,pesticides,tea,solidphaseextraction,gaschromatography2massspectrometry

(Received12June2001;accepted15November2001)