铜在8－羟基喹啉修饰铅笔芯电极上的伏安特性

The Voltammetric Characteristic of Copper on the Pen-Core Electrode Modified by 8 Hydrosyquinoline

本文用８－羟基喹啉修饰的铅笔芯电极研究了铜的阶梯阳极溶出伏安特性，并将此法用于人发中微量铜的测定。实验指出，在此修饰电极上，铜的阶梯溶出峰有两个，１＃峰电位在－０．０３Ｖ，２＃峰电位在０．２７Ｖ处。同样的试液和条件下，１＃峰总比２＃峰的峰电流大。实验研究了测定铜的最佳条件，并测得铜的浓度在４．０×１０－８～１．６×１０－６ｍｏｌ·Ｌ－１范围内，１＃峰的峰高与浓度呈良好的线性关系，最低检测限为２×１０－８ｍｏｌ·Ｌ－１。２＃峰高与铜的浓度在６．０×１０－８～１．６×１０－６ｍｏｌ·Ｌ－１范围内也有较好的线性关系，也可用于测定铜。

In the paper,the anodie stripping voltammetric characteristic of copper is studied by using the pen-core electrode modified by 8-Hydrosyquinoline.This method is ap- plied to the determination of trace copper in hair.The experiments show that two stripping peaks.1~# peak at 0.03 Volt and 2~# peak at 0.27 Volt,are obtained on the oxine modified electrode and the current of 1~# peak is more than that of 2~# peak under the same condition. The optimum conditions of the determination of copper is also investigated by experiments. A good linear relationship between the 1~# peak height and the concentration of copper in the range of 4.0×10^(-8)mol·L^(-1)to 1.6×10^(-6)mol·L^(-1)is obtained.The detection limit is 2× 10^(-8)mol·L^(-1).There is a good linear relationship between the 2~# peak height and the con- centration of copper in the range of 6.0×10^(-8)mol·L^(-1)to 1.6×10^(-6)mol·L^(-1).The reaction mechanism of copper on the modified electrode surface is also discussed.