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Behavior of rare earth uranovanadates in aqueous solutions

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Abstract

The behavior of compounds AIII(VUO6)3·10H2O (AIII = REE = La-Lu, Y) in aqueous solutions was studied in a wide range of solution acidity. The pH range in which the compounds preserve their structure on contact with aqueous solution was determined. Beyond this range, uranovanadates transform into compounds of other compositions and structures, such as vanadium(V) oxide, the corresponding REE hydroxide, and sodium diuranate. The solubility data obtained for AIII(VUO6)3·10H2O were used for calculating the solubility products (SPs) and Gibbs functions of formation of the uranovanadates. Based on the SP values, the theoretical curves of the compound solubility as a function of pH were calculated, and the speciation diagrams of U(VI) and V(V) in aqueous solutions and in the equilibrium solid phases were constructed.

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Authors and Affiliations

  1. Lobachevsky State University, pr. Gagarina 23, Nizhni Novgorod, 603950, Russia

    O. V. Nipruk, N. G. Chernorukov, A. A. Eremina, E. L. Kostrova & K. A. Chaplieva

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  1. O. V. Nipruk
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  2. N. G. Chernorukov
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  3. A. A. Eremina
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  4. E. L. Kostrova
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  5. K. A. Chaplieva
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Correspondence to O. V. Nipruk.

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Original Russian Text © O.V. Nipruk, N.G. Chernorukov, A.A. Eremina, E.L. Kostrova, K.A. Chaplieva, 2014, published in Radiokhimiya, 2014, Vol. 56, No. 4, pp. 332–338.

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Nipruk, O.V., Chernorukov, N.G., Eremina, A.A. et al. Behavior of rare earth uranovanadates in aqueous solutions. Radiochemistry 56, 392–399 (2014). https://doi.org/10.1134/S1066362214040067

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  • DOI: https://doi.org/10.1134/S1066362214040067

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