L-半胱氨酸修饰银电极对锌离子的测定

Electrochemical behavior of zinc(Ⅱ) ion at a self-assembled monolayer of L-cysteine modified Ag electrode

自组装制备了L-半胱氨酸修饰银电极(Cys/SAM/Ag),研究了锌离子在该电极上的电化学行为。建立了一种测量痕量锌离子的新方法,该方法简便,准确,检测限可达1.0×10^(-8)mol/L,在5.0×10^(-3)～1.0×10^(-5) mol/L呈线性。对矿泉水中的锌进行测定,结果满意。

A new chemically modified Ag electrode has been Prepared by using L-eystein as a modifier, the electrochemical behaviors of zinc(Ⅱ) ion on self-assembled monolayer L-cystein modified Ag electrode have been studied. A new approach is developed for sensitive and aceurative determination of zinc by the electrode. The peak of zinc(Ⅱ) ion on Cys/SAM/Ag is proportional to concentration of zinc(Ⅱ) ion between 5.0×10^(-8)～1.0×10^(-5) mol/L. The detection limit is 1.0×10^(-8) mol/L. The modified electrode was used to measure zinc in drinking nature water.