Quadrivalent uranium as a reducing agent in potentiometric titrations: Estimation of ferric and ceric salts

Quadrivalent uranium is found to be a suitable reducing agent in potentiometric titrations, for the estimation of ferric and ceric salts. The stability of the reagent increases by raising the acidity and becomes considerable in the presence of HCl. The stability is not seriously affected by H₃PO₄ although Zn⁺² and Co⁺² ions enhance its oxidation. Light affects the stability of the reagent only in the presence of air.The redox potential varies with l'acidity, being 0.3 volt at 0.1N HCl or H₂SO₄ rising to 0.53 or 0.61 in 1-7 N HCl or 1–9.N H₂SO₄ and increasing thereafter to ~ 1 volt.