APDC-CCl_4对As(Ⅲ)和As(Ⅴ)的萃取行为研究

    • 摘要: 研究了吡咯烷二硫代甲酸铵-氯仿(APDC-CCl4)对As(Ⅲ)和As(Ⅴ)的萃取。实验发现:在低pH值条件下,As(Ⅲ)可被APDC-CCl4定量萃取,而As(Ⅴ)可用Na2S2O3还原为As(Ⅲ)后萃取。CCl4中的As-APDC螯合物可被微碱性的水反萃。APDC-CCl4对As(Ⅲ)、As(Ⅴ)萃取行为的差异可用于水质监测中As(Ⅲ)与As(Ⅴ)的分离。

       

      Abstract: THEEXTRACTIONBEHAVIOUROFAs(Ⅲ)ANDAs(Ⅴ)INAPDC┐CCl4SYSTEMYangRuiyingZhuXuping(InstituteofHighEnergyPhysics,LaboratoryofNuclearAnalysisTechniques,theChineseAcademyofSciences,P.O.Box2732,Beijing100080)ABSTRACTTheextractionandback-extractionbehaviourofAs(Ⅲ)andAs(Ⅴ)inAPDC-CCl4sys-temhavebeenstudied.As(Ⅲ)canbeextractedquantitativelybyAPDC-CCl4systematpH=1—3.As(Ⅴ)canbeextractedafterbeingreducedtoAs(Ⅲ)byNa2S2O3.WaterwithhighpHvaluecanbeusedforback-extraction.Themethodcanbeappliedintheseparationofin-organicAs(Ⅲ)andAs(Ⅴ)inwaterqualityinspection.KeywordsArsenicChelatecompoundSeparation

       

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