【摘要】 研究了利用茜素紫修饰碳糊电极测定痕量锡的阳极溶出伏安法。在 0 1 5mol/L醋酸盐缓冲溶液 (pH 4 .8)中 ,通过开路富集 ,Sn 和茜素紫形成络合物富集于电极表面 ,然后经过介质交换至 3 0mol/L的盐酸溶液中 ,于 -0 .80V还原后再进行阳极化扫描 ,于 -0 .68V左右获得一灵敏的锡的溶出峰。二次导数峰电流与Sn 浓度在 8.4× 1 0 -9～ 1 .4× 1 0 -6mol/L范围内呈良好的线性关系。检出限达 4×1 0 -9mol/L ,同时对电极反应机理进行了讨论。更多还原

【Abstract】 An adsorptive voltammetric procedure for the determination of trace tin at alizarin violet modified carbon paste electrode was described. In the acetate buffer solution (pH 4.8), tin? was accumulated on the electrode surface by the formation of the complex in an open circuit, then determined by anodic stripping voltammetry after medium exchange and potential reduction. A well linear relationship between the peak current and the tin? concentration was obtained in the range of 8.4×10 -9 ～1.4×10 -6 mol/L, the determination limit is 4×10 -9 mol/L for 2 min accumulation time. The proposed procedure has been applied to the determination of tin in cans food satisfactorily.更多还原