The Thermal Stability of Uranium Oxides and Uranium Oxide Hydrates in Water

Vier, D.T.

doi:10.2172/4371480

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Uor + H 0 (U0 ) (0h)r + H + (5)1

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1996

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“…Additional constraints are known to be temperature [30] and (in saline solutions) sodium concentrations [7,8,24,25,40], The instability of U0 3 · 2 H 2 0(s) in presence of other metal ions, e.g. Mg 2+ , Ca 2+ , Ba 2+ , Ni 2+ has been described [41,42], too.…”

Section: Discussionmentioning

confidence: 99%

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Solid-Aqueous Phase Equilibria of Uranium(VI) under Ambient Conditions

Meinrath¹,

Kato²,

Kimura³

et al. 1996

Radiochimica Acta

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The solubility of uranium(VI) is investigated in the pH range 2.8 to 4.6 in equilibrium with 8.0% and 0.3% C0 2 partial pressure and in the pH range 3.8 to 7.0 in equilibrium with 0.03% C0 2 partial pressure at / = 0.1 M NaC10 4 and 25° C. U0 2 C0,(s) under 8.0% and UO, · 2 H 2 0 under 0.3% C0 2 and 0.03% C0 2 partial pressures at pH < 7 are characterized as solubility limiting solid phases. Above pH 7, a spontaneous phase transformation of UO, · 2 H 2 0(S) in a sodium containing poorly crystalline material is observed. Thermodynamic solubility products lg K% = -14.91 ±0.10 for U0 2 C0,(s) and = 4.68 ±0.14 and Ig A? = 5.14 ±0.05 for UO, · 2 H 2 0(s) under 0.3% and 0.03% C0 2 partial pressures, resp. are obtained. The evaluation of UO, · 2 H 2 0(S) solubilities on basis of spectroscopic speciation by TRLFS are discussed and a formation constant lg K', 5 = -17.14 ±0.13 is obtained.

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