Precise determination of uranium in pure uranium and uranium compounds by constant-current coulomeric titration.
A procedure is described for very precise determination of uranium in high-purity uranium and uranium compounds. Uranium(VI) is reduced in a concentrated hydrochloric acid solution by metallic aluminium in the presence of cadmium ions to uranium(III). This is oxidized to uranium(IV) by protons on addition of an excess of orthophosphoric acid, and then oxidized to uranium(VI) by adding a weighed quantity of potassium dichromate in small excess. The excess of potassium dichromate is determined by constant-current coulometry. The coefficient of variation does not exceed 0.003%.
Malinowski
J
J
International Atomic Energy Agency, Seibersdorf Laboratory, Seibersdorf, Niederösterreich, Austria.