A method for quantitative determination of uranium in wet phosphoric acid containing 0.001-0.02% of uranium has been developed. After reduction with Fe or FeSO(4) . H(2)O, uranium(IV) is extracted with a kerosene solution of an equimolar mixture of mono- and dinonylphenylphosphoric acids. The uranium is stripped with an oxidizing medium consisting of 10M H(3)PO(4) containing NaClO(3). The uranium stripped is determined spectrophotometrically with Arsenazo III.
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