Investigations leading to a method for the analysis of mixtures of the oxides UO3, U3O8, and UO2 are described.Uranic oxide is extracted with hot ammonium citrate solution, uranic and uranous-uranic oxides are determined together by solution in phosphoric acid followed by titration of U(VI) with titanous sulphate, and uranous oxide found by difference.
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L.G. Stonhill (1958) studied this question.