以乙基紫为活性物质的聚氯乙烯膜氰化亚金电极的研制和应用

Preparation of Polyvinyl Chloride Membrance Dicyanoaurate Ion-selective Electrode and Its Application

以碱性染料为活性物质制备２０余种不同组分ＰＶＣ膜Ａｕ（ＣＮ）２－电极，确定较佳膜 组成为乙基紫０．９９％，邻苯二甲酸二丁酯６９．２％，ＰＶＣ粉２９．８％。该电极对Ａｕ（ＣＮ）２－浓度 在５．０×１０－７～１．０×１０－２ｍｏｌ／Ｌ范围内接近能斯特响应；斜率为５５．７ｍＶ（３０℃）。稳定性与 选择性较好。该电极制备简单，使用方便，已成功用于氰化镀金液中金的测定。

A PVC membrance dicyanoaurate ion-selective electrode has been prepared. The optimum membrance compositions are ethyl violet 0.99%, dibutyl phthalate 69.2% and PVC 29.8%. In a solution of 0.45 mol/L-Na2SO4 at pH 5.01, the electrode exhibits Nernstian response to An(CN)2- ion from 5.0×10-7 to 1.0×10-2 mol/L with a slope of 55.7 mV (30℃). The electrode shows high selectivity and stability. It has been used successfully for the determination of An(I) in dicyanoaurate plating solution.