流動(dòng)注射氫化物發(fā)生原子吸收測(cè)定痕量鉈的研究.pdf

1、東北大學(xué)碩士學(xué)位論文流動(dòng)注射氫化物發(fā)生原子吸收測(cè)定痕量鉈的研究姓名：朱大安申請(qǐng)學(xué)位級(jí)別：碩士專業(yè)：分析化學(xué)指導(dǎo)教師：徐淑坤2000.3.1AbstractThisworkismainlyconcentratedonthedeterminationoftraceamountsofthalliumbyflowinjectionhydridegenerationatomicabsorptionspectrometry(FIHGAAS、whic

2、hhasmadegreatprogressfortlledeterminationofarsenic，selenium，antimony，bismuth，tellurium，mercury，1ead，andcadmiumsince1986Tothebestofourknowledge，hitherto，thereisnotstudyonusingFIHG—AASforthedeterminationofthalliumpublished

3、ThehydridegenerationisaccomplishedusingaflowinjectionprocessorforvaporgenerationsystemsequippedwithagasexpendedgasliquidseparatorThequartztubeisusedasatomizerwiththeeel】temperaturesettingaf10000CAriSusedforcardergaswitht

4、lleoptimumflowrateof120ml／minTheenhancementreagentforthehydridegenerationiSjmportantbecauseofthelOWsensitivityofthalliumdetectionwithHGAASPalladiumgoldandplatinumarefoandt0haveenhancementeffectsonthegenerationofthalliumh

5、ydrideatthelowerconcentrationsofIxgL1levelPalladiumiSfinallychosenastheenhancementreagentforitsobviousperformanceThee銜eiencyofhydridegenerationwascomparedforthesamplemediumofHCIH2S04andHN03HNOsiSusedforitsstableeffectnle

6、peakheightcallbeenhancedwhilethesamplesolutionisadjustedtocontainOO005％RhodamineBandkepttheni撕Cacidconcentrationat01mol／LTheflowinjectionparametersareoptimizedforthesensitivitytheoptimumconditionsareasfollows：t量leflowrat

7、esofcarrierandreductantwere92ml／minand30ml／minrespectively：samplevolume500BI；reactioncoillength。10cmtheflowrateofwasteis25ml／minTheeffectsofCOexistingelementsonthedeterminationarestudied20rag／1ofMn01)，10m酣ofNiOI)，ZnOI)，C

8、001)CrSn(n)，01m鯽ofBi0II)，As(III)，Se(It)donotinterfereO1mg，lofCd(II)，Hg(ID，andPb(II)showednegativeinterferencesof36％，20％and26％respectivelyonthesignals，butaresuppressedbyincludingof0002％l，10phenanthrolineinthetestsolution，

9、increasingtheirtolerantconcentrationsupto1OO5and05ml／lrespectivelyAdetectionlimit(3a)of34tgL1isobtainedwithasamplingfrequencyof120／11，andaprecisionof09％RSD(n=11，200ng／m1)TherecoveriesobtainedbyspikingthesampleswithlOOng／