鉄鋼中のウランの定量

概要

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Quantitative determination of uranium in steel heretofore has been made by precipitation of large amount of iron with ammonium carbonate or cupferron and the small amount of uranium in the filtrate is separated, but the precipitation of uranium is advantageously made by converting it into tetravalent and that of iron to divalent. The sample is treated with hydrochloric acid to give Fe<SUP>2+</SUP> and U<SUP>4+</SUP>, the solution is neutralized with ammonium carbonate for precipitation of uranium and larger part of the iron is separated by this method. The precipitate and the insoluble residue from hydrochloric acid treatment are combined, treated with sulfuric acid and nitric acid, the solution is reprecipitated with the addition of ammonium carbonate for removal of the iron, chromium, vanadium and molybdenum etc., the filtrate is reduced with zinc amalgam and the uranium is determined by titration with potassium permanganate.