液相微萃取技术与气相色谱联用技术在农药残留分析中的应用-(5992)

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1、determinationofamideherbicidesinrealwater．(2)Asimpleande伍cientliquidphasemicroextractionbasedonsolidificationoffloatingorganicdropcoupledwithgaschromatography-flamephotometricdetectionwasdevelopedfortheextractionandofsometriazineherbicides(metribuzin,simetryn，ametrynandprometryn)insoilsamp

2、les．，nletypeandvolumeoftheextractionsolvent,samplesolutiontemperature，saltaddition，stirringrate，andtheextractiontimefortheextractionwereoptimized．Undertheoptimalconditions，thelinearresponsewasobservedOVertherangeof10-．2000m眺gformetribuzinand2—500mg／kgforsimetryn，ametryn,andprometryn，respec

3、tively,withthecorrelationcoefficients(，)varyingfrom0．9990to0．9992．Thelimitsofdetectionwereintherangebetween0．2and1．0mg／kg20(S／N=3)．111erecoveriesofthetargetanalytesforthespikedsoilsampleswererangedfrom75．5％to97．3％，withtherelativestandarddeviationvalues1essthan7．2％(n=5)．Theenrichmentfactors

4、wereachievedrangingfrom122to336．ThedevelopedmethodWasappliedforthepreconcentrationandofthetriazineherbicidesinrealsoilsamplesandasatisfactoryresultWasobtained．．(3)Asimpledispersive1iquid-liquidmicroextractionbasedonthesolidificationoffloatingorganicdrop(DLLME—SFO)methodcoupledwithgaschroma

5、tograph)，_namephotometricdetection(FPD)Wasdevelopedfortheofelevenkindsoforganophosphoruspesticidesincucumberandgreenpepper．Comparedwimdispersiveliquid—liquidmicroextraction(DLLME)，DLLME—SFOissimple，preciseandreproducible．Moreover,itUSeSless—toxicextractantsolventwithmeltingpointnearroomtem

6、perature，whichmakesitcouldbecollectedeasilybysolidificationinthelowertemperature．Someimportantfactorsthataffecttheextractionefficiencies，such弱typeandvolumeoftheextractionsolvent，temperature，salteffect，stirringrateandtheextractiontimewereinvestigatedandoptimized．Agoodlinearity(，>0．9969)anda

7、broadlinearrange3-3000I-tg／kgforcucumberand1-2000p班gforgreenpepperwereobtained．TIledetectionlimitswereintherangeof1-3．0I_tg／kgforcucumbeand0．3~2．0“g／kgforgreenPepPer．，nlerecoveriesofthetargetanalytesfromcucumberandgreenPepPersampleswererangedfrom81．1％to107．8％．