Chemical stability of rare-earth elements’ uranyl arsenates with general formula MIII(AsUO6)3·16H2O (MIII–La–Lu) in aqueous solution
The chemical stability of uranyl arsenates of rare-earth elements with the general formula M III (AsUO 6 ) 3 ⋅16H 2 O (M III –La–Lu) in aqueous solutions has been studied in a wide range of acidity. The acid–base ranges of the existence of these compounds in aqueous solutions were established, the t...
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Veröffentlicht in: | Journal of radioanalytical and nuclear chemistry 2021, Vol.328 (2), p.739-751 |
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Hauptverfasser: | , , , , |
Format: | Artikel |
Sprache: | eng |
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Zusammenfassung: | The chemical stability of uranyl arsenates of rare-earth elements with the general formula M
III
(AsUO
6
)
3
⋅16H
2
O (M
III
–La–Lu) in aqueous solutions has been studied in a wide range of acidity. The acid–base ranges of the existence of these compounds in aqueous solutions were established, the transformation products formed outside these ranges were identified, and the solubility of M
III
(AsUO
6
)
3
⋅16H
2
O was determined. Based on the experimental data obtained, the solubility products, Gibbs free energies of the formation of the rare-earth elements uranyl arsenates were calculated, the solubility curves of the studied compounds were computed, and the speciation diagrams of uranium(VI), arsenic(V), and rare-earth elements in saturated aqueous solutions and equilibrium solid phases were constructed. |
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ISSN: | 0236-5731 1588-2780 |
DOI: | 10.1007/s10967-021-07692-1 |