饮用水中微量银的微分电位溶出测定法

目的 建立一种富集能力强、分析灵敏度高、抗干扰能力强、精密度好、快速的测定饮用水中微量银的方法。方法 使用微分电位溶出仪（MP-1型），选择玻碳电极为工作电极，进行了峰电位确定实验、辅助电解质的选择、氧化剂的选定、用量和干扰实验等。结果 最低检出限为0.004μg/ml，平均回收率为100.3%，平均RSD为2.73%。结论 微分电位溶出法可用于饮用水中微量银的测定。

Determination of Trace Silver in Drinking Water by Differential Potentiometric Stripping Analysis

Objective To establish a rapid method having great capability for enrichment and anti-interference, higher sensitivity and good precision for determination of trace silver in drinking water. Methods The conditions of determination such as the definition of peak potentials, the selection of auxiliary electrolytes, the selection of kind and amount of oxidants and anti-interference test were carried out by MP-1 potentiometer using glass-carbon electrode. Results The lowest detection limit, average recorery rate and average relative standard deviation were 0.004 ug/ml, 100.3% and 2.73% respectively. Conclusion This method was suitable for determination of trace silver in drinking water.