DMPAQ分光光度法测定岩石中微量铀

    • 摘要: 研究了新试剂5-(4-二甲氨基苯偶氮)-8-羟基喹啉(DMPAQ)与铀(Ⅵ)的显色反应。在非离子型表面活性剂TritonX-100存在和pH7.0—9.0缓冲介质中,铀(Ⅵ)与DMPAQ形成稳定的1∶2配合物,最大吸收波长为515nm,摩尔吸收系数κ=5.6×103m2/mol,铀的含量在0—2.0μg/mL范围内符合比耳定律。在适量的CyDTA存在下,大多数常用离子不干扰测定。经TBP萃取色层分离后,本法用于岩石中微量铀的测定。

       

      Abstract: SPECTROPHOTOMETRICDETERMINATIONOFMICROAMOUNTSOFURANIUMINROCKSWITHDMPAQYingMinChenYiwen(DepartmentofChemistryandChemicalEnginering,HunanUniversity,Changsha410082)ZhangXiaominZhouYufenHuangXiaowu(DepartmentofAppliedChemistry,EastChinaGeologicalColege,Nanchang344000)ABSTRACTThecolorreactionofuranium(Ⅵ)withanewlysynthesisedreagent,5-(4-dimethylaminophenylazo)-8-hydroxyquinoline(DMPAQ),hasbeeninvestigated.InamediumofTri-tonX-100andpH7.0~9.0bufersolution,U(Ⅵ)reactswithDMPAQtoformastablecom-plexwithamolarratioof1∶2.Thecomplexexhibitsamaximumabsorptionat515nmwithanapparentmolarabsorptivityof5.6×103m2/mol.Beer′slawisobeyedintherangeof0—2.0μg/mLofU(Ⅵ).InthepresenceofCyDTA,mostcommonionsdonotinterferewiththedeterminationofU.TheproposedmethodisappliedtothedeterminationofmicroamountsofuraniuminrocksaftertheseparationbyTBPchromotography.Theresultsaresatisfactory.KeywordsUranium(Ⅵ)5-(4-Dimethylaminophenylazo)-8-hydroxyquinolineSpec-trophotometry

       

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