Abstract

A comprehensive study of the state of alkaline-earth metal uranoarsenates in saturated aqueous solutions in a wide range of solution acidity was made. A physicochemical model based on the experimental solubility data and on principles of equilibrium thermodynamics was suggested for quantitative description of the state of the heterogeneous system crystalline uranoarsenate MII(AsUO6)2·nH2O-aqueous solution. The model was applied to calculation of the solubility products and Gibbs energies of formation of alkaline-earth metal uranoarsenates, and also of distribution diagrams of equilibrium aqueous solutions and bottom phases.

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