Affiliation:
1. SUBATECH UMR 6457, Université de Nantes, Ècole des Mines, IN3P3/CNRS, Nantes Cedex 03, Frankreich
Abstract
AbstractInterpretation and modeling of recent experimental data [1] yield thermodynamic constants for the distribution of trace Np(V) between aqueous solutions and uranophane. These data indicate that neptunyl is relatively excluded from the uranyl mineral structure, but the interpretation depends on uncertain aqueous speciation and thermodynamic properties as a function of temperature. Despite Np exclusion, the low calculated solubility of uranophane at 25 °C under conditions relevant to the proposed nuclear waste repository at Yucca Mountain, Nevada, leads to Np concentrations at equilibrium with a Np-bearing uranophane solid solution that are low compared to concentrations invoked as solubility limits in Yucca Mountain performance assessments.
Subject
Physical and Theoretical Chemistry
Cited by
14 articles.
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1. The crystal structures and mechanical properties of the uranyl carbonate minerals roubaultite, fontanite, sharpite, widenmannite, grimselite and čejkaite;Inorganic Chemistry Frontiers;2020
2. Thermodynamic properties of the uranyl carbonate minerals roubaultite, fontanite, widenmannite, grimselite, čejkaite and bayleyite;Inorganic Chemistry Frontiers;2020
3. Theoretical Studies of the Structural, Mechanical and Raman Spectroscopic Properties of Uranyl-Containing Minerals;Minerals;2019-11-13
4. The Application of Periodic Density Functional Theory to the Study of Uranyl-Containing Materials: Thermodynamic Properties and Stability;Density Functional Theory;2019-01-30
5. Rb2[Ca(NpO2)2(PO4)2], the First Mixed Alkali–Alkaline Earth Metals Neptunyl(V) Phosphate: Crystal Chemistry and Sheet Stereoisomerism;Crystal Growth & Design;2018-11-06