アルミニウム地金中の微量ウランの光度定量

概要

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A method for the spectrophotometric determination of trace uranium in aluminum metals with ArsenazoIII was established, in which the uranium complex was extracted into butanol in the presence of diphenylguanidine. The disturbance with aluminum was removed satisfactorily by the addition of sodium fluoride and boric acid.<BR>One g of sample was dissolved in hydrochloric acid, and 5g of sodium fluoride and 0.5g of boric acid were added. After the boiling, diphenylguanidine was added and the pH of the solution was adjusted to 1.5±0.2.After the addition of Arsenazo III, the complex wasextracted into butanol, and the absorbance at 660mμwas measured.<BR>As little as 0.41.0ppm of uranium was detectedand determined by the method proposed. Alternatively, a fluorometric determination after the isolation of uranium by the proposed method gave values agreeing well with those by the spectrophotometrv.
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