辛可宁修饰碳糊电极的应用研究——铋的阳极溶出伏安法测定

Study on Application of Cinchonine-modified Carbon Paste Electrode: Anodic Stripping Voltammetry Determination of Bismuth

报道了利用辛可宁修饰碳糊电极测定铋的方法 ,在1mol/LH2SO4 溶液中 ,通过在 -1.00V电位下富集Bi3 + 后 ,在 -0.20～ +0.15V电位范围内作阳极溶出伏安法测定。在 -0.022V处有一灵敏的氧化峰 ,峰电流与Bi3 + 浓度在1.0×10-8 ～1.0×10-4 mol/L范围内成良好的线性关系 ,检出限为5.0×10-9 mol/L。其他金属离子不干扰测定。

A method for the determination of bismuth is reported with self _ made carbon paste electrode modified by cinchonine. After bismuth ions are accumulated under the applied potential of -1.00 V for 120 s on the chemical modified electrode in 1 mol/L H2SO4 solution, there is a sensitive oxidation peak of Bi at -0.022 V(vs SCE) in the determination by anodic stripping voltammetry(ASV). Dependence of current on concentration is linear from 1.0×10-8 to 1.0×10-4 mol/L of Bi3+. The detection limit is 5.0×10-9 mol/L. Other metal ions do not interfere in the determination.