铜离子修饰电极上铜(Ⅱ)的示波电位滴定法及其应用

Investigation and application of oscillo-potentiometric titration of copper(Ⅱ) at copper(Ⅱ)-modified electrode

以铜(Ⅱ)为修饰物,铜片为基体,制成铜修饰电极.提出了一个快速测定铜(Ⅱ)的示波电位滴定法.以EDTA为滴定剂,甘汞电极为参比电极,修饰铜电极为指示电极,利用阴极射线示波器荧光点的突然位移指示EDTA滴定铜的终点,具有准确、灵敏、快速等特点,用该法测定含铜(Ⅱ)试样,结果良好.

Copper modified electrode with Cu^(2+) is employed for the rapid detemi-nation of copper() by oscillo-potentiometric titration. The copper-modified electrode is used as an indicator electrode,while the calomel electrode as a reference electrode.EDTA solution is used as titrant.The end point of coppr by EDTA is indicated by the sudden movement of a fluorescent spot on the screen of the cathode-ray oscillograph.This new method features sensitivity,precision and rapidness.Results of copper() determination are in agreement with the reference values quite well.