[en] A method of constant-current coulometric titration for determination of uranium in uranium oxide is described. The method involves using Cr(II) as reductant to reduce U(VI) to U(IV) in H₂SO₄-H₃PO₄ medium, oxidizing the excess Cr(II) in air, adding the amount of solid K₂Cr₂O₇ slightly larger than that required for quantitative oxidation of U(IV) and titrating the excess K₂Cr₂O₇ with the electrogenerated Fe(II). The endpoint is determined amperometrically and the reduction-oxidation process was determined. The precision of the method indicated by the standard deviation of an individual observation is better than 0.01% for 1 g uranium oxide