脉冲阳极溶出伏安法测定钚中痕量银

本工作以Nafion树脂修饰玻碳电极为工作电极、铂片电极为对电极、饱和甘汞电极(SCE)为参比电极,进行电极修饰技术研究,建立了脉冲阳极溶出伏安法测定钚中痕量银的分析方法。实验结果表明,银的阳极溶出峰的峰电流与银离子浓度在10~100μg/L范围内呈线性关系,银离子的定量检测下限为5ng/mL,回收率为90%~109%,该方法取样量小、抗干扰能力强、重现性好。

Determination of Trace Silver in Plutonium by Pulse Anodic Stripping Voltammetry

A method for precise determination of trace silver in plutonium by pulse anodic stripping voltammetry was developed. The experimental conditions were optimized. In solution of 0.1 mol/L HNO₃ 0.1 mol/L KNO₃, silver was accumulated on the Nafion modified glassy carbon electrode surface at -0.5 V (vs SCE) for 300 seconds and then a sensitive oxidation peak of Ag was observed by anodic stripping voltammetry. The peak current is proportional to the concentration of Ag⁺ in the range of 10-100 μg/L. The detection limit of Ag⁺ is 5 ng/mL and the recovery for addition standard is 90%-109%. This is simple, sensitive and selective method.