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  • 1 Iraqi Atomic Energy Commission Chemistry Department, Nuclear Research Center Baghdad (Iraq)
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The high-precision uranium determination by reduction with ferrous sulfate in phosphoric acid and titration with dichromate, which is applicable to nuclear-grade uranium compounds in which the uranium exists nearly exclusively as U(IV), has been modified. The modification enlarges the range of applicability of the original method to include the analysis of uranium compounds in which the uranium exists as U(VI) or as a mixture of U(IV) and U(VI), such as U3O8. The modified method has the same precision, relative freedom from interferences and applicability for routine use as the original method.