Abstract
Trace amounts of Ag in metallic U were determined by anodic stripping coulometry. For samples containing less than 0.4 ppm Ag, Ag was separated from U by coprecipitation with thallous iodide; then the precipitate was dissolved with a sulfuric acid-hydrogen peroxide mixture. The solution was evaporated to dryness, and Ag was determined by anodic stripping coulometry. For samples containing more than 0.4 ppm Ag, it could be determined in the presence of the large amount of U without preliminary separation. In the latter case. the effect of U was suppressed by formation of citrate complex. Satisfactory results were obtained by both methods. The effects of volume and pH of the electrolyte solution were also studied. For 10 ml of the electrolyte solution, 80-min electrodeposition was advisable, where 0.1 to 2 g Ag was to be determined. For 20 ml, 3-hr electrodeposition was advisable, where 0.3 to 2 g Ag was to be determined. Variation of pH (3 to 7) of the electrolyte did not influence the dissolution curve area. (H.H.D.)
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