Chemical stability of alkali elements' uranyl vanadates in aqueous solutions

被引：0
作者：
Nipruk, Oxana V. [1 ]
Chernorukov, Nikolay G. [1 ]
Klinshova, Kseniya A. [1 ]
Bakhmetev, Maxim O. [1 ]
Tumaeva, Olga N. [1 ]
Udalov, Il'ya D. [1 ]
机构：
[1] Lobachevsky State Univ Nizhni Novgorod, Chem Dept, Gagarin Ave, 23, Nizhnii Novgorod 603022, Russia
来源：
JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY | 2023年 / 332卷 / 2期
关键词：
Uranyl vanadates; Alkali elements; Chemical stability; Solubility; Speciation diagrams; Conversion; OR-EQUAL-TO; CRYSTAL-STRUCTURE; LAYERED COMPOUNDS; OPEN-FRAMEWORK; URANIUM; CARNOTITE; VANADIUM; URANOPHANE; URANOVANADATES; EQUILIBRIA;
D O I：
10.1007/s10967-022-08733-z
中图分类号：
O65 [分析化学];
学科分类号：
070302 ; 081704 ;
摘要：
The chemical stability of uranyl vanadates A(I)VUO(6)center dot nH(2)O (A(I)-Li, Na (n = 2), K, Rb, Cs (n = 0)) in aqueous solutions was investigated for the first time. The medium acidity was established to have the largest influence on the state of the studied compounds in heterogeneous aqueous-salt systems. The compounds were found to be stable in the pH range of 0 - 2-11 - 14. Alkaline elements uranyl vanadates' solubility changes from 10(-8) to 10(-6) mol/l in neutral solutions to 10(-4) to 10(-1) mol/l in acidic and basic media. The chemical stability of A(I)VUO(6).nH(2)O increases from lithium to caesium. The solubility products were calculated to be in the range of 10(-29.2) (Li) to 10(-34.1) (Cs). Gibbs free energies of the formation and dissolution of the studied compounds, their solubility curves and the speciation diagrams for U (VI) and V (V) in both liquid and solid phases were also calculated.
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收藏
页码：355 / 367
页数：13
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