中空纤维液相微萃取和浊点萃取技术的分析及其在痕量铅分析中的应用

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1、万方数据江苏大学硕士学位论文ABSTRACTLeadisatoxicheavymetal，itcallbeeasilyassimilatedbyhumanbodythroughaseriesofcomplicatedfoodchainfromenvironmentwaterandfoodsamples．Whentheconcentrationofleadinthehumanbodyistoohigh，itCanaffectthenervoussystems，digestivesystem，hematopoieticsystem，italsocarlaffectthementaldev

2、elopment．Therefore，accurateandsensitivemethodfordeterminationofleadconcentrationinenvironmentalsamplesisgettingincreasinglyattention．ThesamplepretreatmenttechnologyCanenrichlowconcentrationtargetanalytesfromsamplesolutions，improvetheaccuracyofanalyticalmethod．Inaddition，thesamplepretreatmenttec

3、hnologycanremovetheinterferencecomponentsfromcomplexmatrixsample，achievepurificationfunction，avoidtheeffectofimpuritiesontheinstrumentdetermination．Asaresult，thesamplepretreatmentmethodisessentialstepinsampleanalysis．Inthispaper,westudytwokindspretreatmentmethods：hollowfiberliquid-phasemicroext

4、ractionanddualcloudpointextractionfordeterminationoftraceleadinenvironmentalwaterandfood．Thespecificworksarelistedasfollows：1．Hollowfiberliquid-phasemicroextractionfordeterminationoftraceleadfromenvironmentalwaterandfood．(1)Ionicliquid—Hollowfiberliquidphasemicroextractionfordeterminationoftrac

5、eleadfromenvironmentalwaterandfood．SomeimportantparameterssuchasPANconcentration，pH，EDTAconcentration，stirringrate，extractiontimeandinterferingmetalionswereinvestigated．Undertheoptimizedconditions，anenrichmentfactorof210andalimitofdetectionof0．004ng／mLwereobtained．(2)DCH18C6一hollowfiberliquidph

6、asemicroextractionwasusedtoselectiveextractionandpreconcentrationofPb(II)frommedicinalplants．WestudiedtheinfluenceofDCH18C6concentration，EDTAconcentration，thepHofacceptorsolutionanddonorsolution，extractiontimeandstirringrateontheextraction万方数据中空纤维液相微萃取和浊点萃取技术的研究及其在痕量铅分析中的应用efficiency．Undertheop

7、timizedconditions，allenrichmentfactorof199andalimitofdetectionof0．008ng／rnLwereobtained．TheobtainedresultsshowthatDCH18C6carlselectiveandefficienttransportofPb(II)fromtheaqueousphasecontainingdifferentconcentrationofheavymetalions