脉冲阳极溶出伏安法测定钚中痕量银

Determination of Trace Silver in Plutonium by Pulse Anodic Stripping Voltammetry

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5 ng／m L ，回收率为90％～109％，该方法取样量小、抗干扰能力强、重现性好。

A method for precise determination of trace silver in plutonium by pulse anod‐ic 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 voltamme‐try .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% .T his is simple ,sensitive and selective method .