離子交換分離富集技術在FAAS和ICP-MS中的應用研究.pdf

1、中國科學技術大學碩士學位論文離子交換分離富集技術在FAAS和ICPMS中的應用研究姓名：孫梅申請學位級別：碩士專業(yè)：分析化學指導教師：陳樹榆2000.4.1里型蘭墊查查蘭堡主堡塞塑塞!墨蘭!AbstractInthisdissertationthetechniquesofflowinjectionon—lineion—exchangepreconcentrationcoupledwithFlameAtomicAbsorptionSpec

2、trometry(FAAS)andion—exchangepreconcentrationassociatedwithInductivelyCoupledPlasma—MassSpectroscopy(ICP—MS)wereinvestigatedNewmethodsweredeveloppedtodeterminetraceelementsinenvironmentalsamplesusingFAASandICP—MSTheveryl

3、owconcentrationofelementsinAntarctic—watersampleswasmeasuredbythesenewmethodsFirst，thetechniqueofflowinjectionon—lineion—exchangepreconcentrationcoupledwithFAASwasstudiedThecationexchangeresinDowex(H十，50Wx8)wasusedasfill

4、ingmaterialinthepreconcentrationforthefirsttimeThemeasuringsensitivitiesofCu，PbandCdincreaseby270，375and275timesrespectivelyafterbeingpreconcentratedforonlyoneminuteTheresultsshowthatthecation—exchangeresinDowex(50Wx8)ha

5、ssomeadvantagessuchashighenrichmentfactorgoodphysicalandchemicalstability，noobviousexpandingphenomenon，definiteselectivityforanalyte，longlifespan，lowpriceItcanbeappliedtoanalyzevarioussampleseconomicallyandefficientlyThe

6、n，inordertoimprovethesamplingfrequencyandincreasepreconcentrationefficiencyasystemcomposedoftwo—pump，one—valveandtwo—columnwasusedinthetechniquesofflowinjectionon—lineion—exchangepreconcentrationcoupledwithFAASDetailpara

7、meterstOobtainthebestperformanceofthedoublecolumnsystemwereinvestigatedComparedwiththesingle—columnsystem，thesamplingfrequencywastwiceat60N／hThecontinuousdeterminationcouldberealizedWhenchelatingcation—exchangeresinChele

8、x一100wasused，themeasuringsensitivityofCu，Pb，CdandMnenhancedby33，50，37and29times，respectivelyTheabovetwoanalyticalmethodswereusedtoanalyzetheNationalStandardsamplesandenvironmentalsamplesTheresultshavegoodprecisionandaccu