Abstract
The sample was dissolved in nitric acid and sulfuric acid followed by the additions of thallous sulfate and potassium iodide. The silver coprecipitated with thallous iodide was taken up in sulfuric acid and hydrogen peroxide. The solution was evaporated to dryness and the residue was treated with acetic acid (60vol%) and p-dimethylaminobenzylidenerhodanine (0.004%).The light absorbency at 580mμ indicated the amount of silver. 0.44ppm silver in uranium metal could be estimated, provided 5g sample was taken and was made up into 5ml of the colored solution. The coprecipitation rate with thallous iodide was confirmed to be more than 95%, by using 110m Ag as a tracer.
