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Discussion of ResultsThe results show that uranium can be separated from iron and titanium by electrolysis of a solution containing these elements followed by the precipitation of titanium with cupferron. The uranium then can be determined volumetrically.The average value of the uranium content found for kolm is slightly higher than that of Wells,2 0.462% compared to his average, 0.432%. This value, 0.462, also increases the discrepancy between the chemical analysis and the radioactive analysis of the kolm.It is of interest to note that the uranium content of the Canadian uraninite found by the above described volumetric method (53.47%) is in close agreement with the value (53.52%) found by Wells, who made a gravimetric analysis on material taken from the same twenty-pound sample. Summary 1. Large amounts of iron can be separated completely from small amounts of elements such as titanium, vanadium and uranium by electrolysis using a mercury cathode.2. Uranium cannot be determined accurately in presence of titanium by titration with permanganate after reduction by zinc. 3. The color change of permanganate in cold colored solutions is remarkably intensified by the presence of a little diphenylamine sulfonic acid.4. Uranium in kolm ash and in a Canadian uraninite was determined volumetrically. Results on both substances agree well with the gravimetric results reported by R. C. Wells.

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