苏木精和石墨烯修饰玻碳电极差分脉冲伏安法测定铜

石墨烯通过滴涂法固定在玻碳电极上，苏木精通过电聚合在石墨烯表面形成聚合膜，依托该修饰电极建立了差分脉冲伏安法测定痕量铜的电化学分析法。在0.1 mol/L pH 4.2的NaAc-HAc缓冲液中，于-0.3 V处搅拌富集4 min，测定0.13 V处的峰电流。峰电流与Cu2+的浓度在5×10-8~2×10-7 mol/L和2×10-7~5×10-6 mol/L范围内呈良好的线性关系，相关系数为0.992和0.996。方法的检出限为2×10-9 mol/L。将该法用于工业废水中痕量铜的测定，与ICP-AES法的测定结果相一致，相对标准偏差为4.3%~5.7%。

Determination of copper by differential pulse voltammetry based on hematoxylin and graphene modified glassy carbon electrode

Graphene was coated on glassy carbon electrode (GCE) while hematoxylin was electrodeposited on the graphene film to construct the modified electrode. Electrochemical method for trace copper determination was developed using this modified electrode with differential pulse voltammetry. It was indicated that the peak currents varied linearly with the concentration of Cu2+ over the range from 5×10-8 to 2×10-6 mol/L with the correlation coefficent of 0.992 and 0.996, through the determination of peak current at 0.13 V after the sample was accumulated for 4 min at -0.3 V in a 0.1 mol/L pH 4.2 NaAc-HAc buffer. The detection limit was 2×10-9 mol/L. The proposed method was used to determine trace copper in industrial wastewater with the relative standard deviations of 4.3%-5.7%. The results agreed well with those obtained by ICP-AES method.