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.