Abstract
containing U(IV) polymer start to form. With an increase in pH from 1.5 to 4 or in temperature, the induction period becomes shorter. Under anaerobic conditions, the colloidal solution is stable for more than a month. Centrifugation at 8000 rpm (5500g) allows separation of the colloidal particles from the liquid phase. The colloid slowly dissolves in mineral acids saturated with argon or in a K2CO3 solution, whereas precipitates of individual freshly prepared U(IV) and U(VI) hydroxides dissolve rapidly. Short UV irradia-of a UO2(ClO4)2 solution saturated with argon and containing ethanol (pH 2.5) results in the appearance of U(V) which then disproportionates, and U(IV) forms with U(VI) a black colloid similar to that arising on mixing U(IV) and U(VI) solutions.
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Original Russian Text © A.V. Gogolev, V.P. Shilov, V.F. Peretrukhin, A.B. Yusov, A.M. Fedoseev, 2008, published in Radiokhimiya, 2008, Vol. 50, No. 4, pp. 303–307.
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Gogolev, A.V., Shilov, V.P., Peretrukhin, V.F. et al. Formation of a sol of mixed U(IV) · U(VI) hydroxide in aqueous solutions with pH 1.5–4. Radiochemistry 50, 349–353 (2008). https://doi.org/10.1134/S1066362208040036
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DOI: https://doi.org/10.1134/S1066362208040036