快速共沉淀富集與原子吸收光譜聯(lián)用的研究.pdf

1、同濟大學理學院碩士學位論文快速共沉淀富集與原子吸收光譜聯(lián)用的研究姓名：郝冰冰申請學位級別：碩士專業(yè)：分析化學指導教師：蘇耀東20060201ABSTRACTABSTRACTThepreconcentrationmethodplaysallimportantroleinimprovingthedetectionlimitandsensitivityCoprecipitationiswidelyusedforconcentrationoft

2、racemetalspriortovariousdeterminationtechniquesincludingflameatomicabsorptionspectrometryHoweverthecoprecipitationissometimestroublesomeandtimeconsumingduringfiltrationwhichisfrequentlyusedforcollectionofprecipitateThepr

3、oblemwasnotsolveduntilarapideoprecipitationtechniquewasfirstproposedbyShigehiroandhiscollegesTheyhavesuggestedthatGAP04isanexcellentcoprecipitantfortherapidcoprecipitationtechniquepriortoFAASdeterminationofleadinwastewat

4、erThismethoddoesnotrequireacompletecollectionoftheprecipitate，becausethe蕊ooftherecoveryofPbtothatofGa、豫salmostconstantregardlessoftherevoveryofprecipitateThusthetimerequiredforpreconcentrationbythecoprecipitationisconsid

5、erablyshortenedInthiswork，wefirstinvestigatedwaystoapplyMnandNiasinternalstandardizationstorapidcoprecipitationtechniqueusingSQTMg(II)，Mg(OHhandAPDCNi雒coprecipitantrespectivelyforFAASdeterminationofPb，Cd，CuFe，Co，Niinbeer

6、andwastewaterWeverifiedthatthecarrierelementinternalstandardizationandthecoprecipitatedmetalsmustalsobehomogeneouslydistributedOVerthewholeprecipitateThecontentofNiandMnare1501xgand500tagrespectivelywhicharefarhigherthan

7、theactualcontentofthatinsamplesandthuscanbeneglectInordertoincrea∞theamountofMnweusedthesecondarysensitivityline4031nmofMnand3415nmofNiasanalyticallinerespectivelyandtheresultsshowitispracticableThestandardadditionrecove