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Solubility measurements of the uranyl oxide hydrate phases metaschoepite, compreignacite, Na–compreignacite, becquerelite, and clarkeite

Drew Gorman-Lewis, Jeremy B. Fein

2008ensolubilityuraniumthermodynamicsminerals

Abstract

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The mobility of uranium under oxidizing conditions can only be modeled if the thermodynamic stabilities of the secondary uranyl minerals are known. Toward this end, we synthesized metaschoepite, becquerelite, compreignacite, sodium compreignacite, and clarkeite, and performed solubility measurements from both undersaturation and supersaturation under controlled-pH conditions. The solubility measurements rigorously constrain the values of the solubility products for these synthetic phases and consequently the standard-state Gibbs free energies of formation of the phases. The calculated lg solubility product values, with associated uncertainties, for metaschoepite, becquerelite, compreignacite, sodium compreignacite, and clarkeite are provided. Additionally, we calculate standard-state entropies of formation and provide their uncertainties. This research contributes to a better understanding of the stability and solubility of these phases under relevant geological and environmental conditions.

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Cite This Work

@article{1695ca22-5f46-4179-adc0-9f8ca797dd35,
  title={Solubility measurements of the uranyl oxide hydrate phases metaschoepite, compreignacite, Na–compreignacite, becquerelite, and clarkeite},
  author={Drew Gorman-Lewis and Jeremy B. Fein},
  year={2008},
  language={en}
}
TY  - JOUR
TI  - Solubility measurements of the uranyl oxide hydrate phases metaschoepite, compreignacite, Na–compreignacite, becquerelite, and clarkeite
AU  - Drew Gorman-Lewis
AU  - Jeremy B. Fein
PY  - 2008
LA  - en
ER  -

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