碘离子对铜阳极溶出的影响  

The Influence of Iodide on the Deter-mination of Copper by Anodic StrippingVoltammetry

作　　者：罗红霞[1] 王曙[1] 

机构地区：[1]河南师范大学化学系,四川轻化工学院化工系

出　　处：《分析试验室》1995年第2期45-47,63,共4页Chinese Journal of Analysis Laboratory

摘　　要：本文用阳极溶出伏安法直接在玻碳电极上测定铜。在Ｈ＿２ＳＯ＿４介质中加入微量碘离子使灵敏度大大提高，可测定１ｎｇ／ｍＬ铜。该方法用于人体血清中铜的测定，结果令人满意。证明在碘离子存在下，铜溶出时生成了碘化亚铜沉淀，加速了溶出反应的进行。利用溶度积的关系来提高阳极溶出伏安法的灵敏度，是一种有效的方法。he determination of copper in thebase solution of 0.2mol/L H_2SO_4-5×10￣(-4)mol/L I￣- by using ASV with rotating discglassy carbon electrode as working electro-de is described.The method has been appliedto the determination of copper in humanserum,the results are reliable and satisfacto-ry, the recovery was 95%～105%,Themechanism of stripping process was studied. The copper preconcentrated on working elec-trode produced Cu￣+ in the stripping process,which would react with I￣- in the base solu-tion,and gave rise to Cu_2I_2 precipitate,Sothat the stripping process was accele vatedand the sensitivity was increased.Therefore. using solubility product to increase the sen-sitivity of ASV was very convenient andcould be well utilized.

关 键 词：碘离子 铜 阳极溶出 伏安法 血样 

分 类 号：O614.121[理学—无机化学]