Abstract
Redox potentiometric titration of small amounts of U in mixed phosphoric-sulfuric acid systems with an automatic titrator was studied. The U determination accuracy is strongly affected by the aqueous phase composition and kind of titrant. In determination of 0.1–0.2 mg of U in mixed phosphoric-sulfuric acid solutions containing 6 M H3PO4 and 1.25 M H2SO4, the titrant efficiency decreases in the order NH4VO3 > KMnO4 > Ce(SO4)2 > K2Cr2O7. In 2 M H2SO4, the use of KMnO4 as titrant allows determination of 0.02–0.1 mg of U with the uncertainty within 10%.
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