Abstract
The sample was dissolved in hydrochloric acid and hydrogen peroxide. For the extraction of trace amount of lead from large amount of uranium, dithizone-benzene solution was used. To mask the trace impurities as Cu, Ni, Fe, Zn in uranium on during the extracting procedure, ammonium citrate, sodium sulfite, potassium cyanide, and ammonium hydroxide were added preliminarily to the sample solution. The lead extracted into the dithizone-benzene solution was shaken with and transfered into 0.45N perchloric acid, and determined by the A. C. polarography.
In the case of spectrophotometric determination, the absorbancy of the extracted dithizone-benzene solution was measured at 520 mμ.
Good agreement was obtained between the results from the two methods.
