铜离子在聚L-谷氨酸修饰玻碳电极上的电化学行为研究

Electrochemical behavior of copper(Ⅱ) ion on poly(L-glutamic acid)modified glassy carbon electrode

采用循环伏安法制备了聚L-谷氨酸修饰玻碳电极,研究了铜离子在该修饰电极上的电化学行为,并提出了一种新的用于检测铜离子的方法.在pH值为6.86的混合磷酸盐缓冲溶液中,铜离子的阳极氧化峰电流与其浓度在1×10-7~1×10-3mol L范围内呈较好的线性关系,相关系数为0.999 5,检出限为0.1 nmol L.实验结果表明,该修饰电极制作简便,重复性和稳定性良好,可望用于铜离子定量检测.

The preparation of poly（L-glutamic acid） modified glassy carbon electrode and the electrochemical behavior of copper（Ⅱ） ion on this modified electrode were studied.A novel method was developed for determination of copper（Ⅱ） ion.In PBS buffer solution of pH 6.86,the anodic oxidation peak current of copper（Ⅱ） ion increased linearly with the concentration in the range of 1×10-7 to 1×10-3 molL with the correlation coefficient of 0.999 5 and the detection limit was 0.1 nmolL.It showed that the modified electrode was easy to prepare with good reproducibility and stability and would be applied to the quantitative determination of copper（Ⅱ） ion.