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用碳纳米管和纳米TiO2混合修饰碳糊电极,用循环伏安法考察了修饰电极测量Cu的优化条件及其电化学稳定性。结果表明,在pH=5.5的HAc-NaAc缓冲溶液中,当Cu2+在修饰电极表面富集200 s、电位扫描速率控制在60 mV/s时,修饰电极在循环伏安图上能出现1个灵敏氧化峰,峰电位为0.141V,利用这个峰可以对Cu进行检测。峰电流与Cu2+的浓度在1.0×10-7～1.0×10-4 mol/L的范围内成良好线性关系,相关系数为0.994 4,检出限为1.43×10-8mol/L。
Carbon nanotubes and nano-TiO2 mixed modified carbon paste electrode, with cyclic voltammetry investigated the modified electrode to measure the optimal conditions of Cu and its electrochemical stability. The results showed that when the Cu2 + was concentrated on the surface of the modified electrode for 200 s and the potential scan rate was controlled to be 60 mV / s in HAc-NaAc buffer solution with pH = 5.5, the modified electrode showed a sensitivity on the cyclic voltammogram Oxidation peak, the peak potential of 0.141V, the use of this peak can be detected on the Cu. The peak current has a good linear relationship with the concentration of Cu2 + in the range of 1.0 × 10-7 ~ 1.0 × 10-4 mol / L with a correlation coefficient of 0.994 4 and a detection limit of 1.43 × 10-8 mol / L.