EDTA修饰碳糊电极测定铜离子

EDTA modified carbon paste electrode for determination of copper ion

制备了乙二胺四乙酸（EDTA）化学修饰碳糊电极，采用电位分析方法，在pH=3．3的Britton-Robinson缓冲溶液中对Cu^2＋进行测定。Cu^2＋浓度对数在1．0×10^-6～1．0×10^-3mol·L^-1内与电位值呈良好线形关系，检出限4．3×10^-7mol·L^-1。通过与原子吸收测定结果对照和电极选择性系数、电极响应时间等参数对本方法进行评价，应用于实际样品的测量，获得了满意的结果。

An ethylenediaminetetraacetic acid（EDTA） modified carbon paste electrode was prepared and used in the determination of Cu^2＋ in the Britton-Robinson（B-R） solution（ pH = 3.3 ）. The potential is proportional to the logarithm of concentration of Cu^2＋ in the range 1.0×10^-6～1.0×10^-3 mol·L^-1. The detection limit was 4. 3×10^-7 mol·L^-1. This method has been applied to the determination of actual sample and the result is satisfied comparing with atomic absorption spectroscopy.