流動注射在線預(yù)濃集—原子吸收法用于鉻的形態(tài)分析.pdf

1、南開大學(xué)碩士學(xué)位論文流動注射在線預(yù)濃集—原子吸收法用于鉻的形態(tài)分析姓名：龍志成申請學(xué)位級別：碩士專業(yè)：分析化學(xué)指導(dǎo)教師：王新省2002.5.1AbstractAnewmethodforspeciationandquantificationofCr(VI)andorganicallyboundCr(1II)inwatersamplesbyflameatomicabsorptionspectrometry“s1“go“。““。Dreconc

2、entrationonamicrocolumnpackedwithD301anion—exchangeresinhasbeendevelopedBothspecieswereretainedontheresinsimultaneouslyandthenelutedsequentiallywith10mol／LhydrochloricacidfororganicallyboundCr(111)and20mol／Lammoniumnitra

3、te／05mo此ammoniaforCr(V1)Parametersaffectingsensitivity，suchaspH，pumpflowrate，werestudiedinadditiontooptimalFAASDarametersFor60secondssampleloading，thedetectionlimitsforCr(V1)andfororganicallyboundCr(IU)were18and20ng／mlwi

4、thstandarddeviatio“s(RSO，100ng／ml，n=l1)ofl4％and16％，givingasensitivityenhancementof24，respectivelyTheeffectofconcomitantionsWaSinvestigated，andsatisfactoryrecoverycouldbeobtainedfromnaturalwatersamplesOnthebasisoftheseres

5、ults，theflowinjectionmanifoldWaSmodifiedtocouplewithgraphitefurnaceatomicabsorptionspectrometrydetectionThedetectionlimitswerereducedtoO006ng／mlfor30secondssampleloadingInanotherflowinjectionon—linepreconcentrationsystem

6、，D411chelatingresinwasusedforretentionofinorganicCr(III)Thedetectionlimitwas13ng／ml，givingasensitivityenhancementof29for60secondssampleloadingKeywords：Chromium，Speciation，F(xiàn)lowInjectionAnalysis，AtomicAbsorptionSpectrometr