Abstract
The dissolution and growth of uranophane [Ca(UO 2) 2(SiO 3OH) 2·5H 2O] have been examined in Ca- and Si-rich test solutions at low temperatures (20.5 ± 2.0 °C) and near-neutral pH (∼6.0). Uranium-bearing experimental solutions undersaturated and supersaturated with uranophane were prepared in matrices of ∼10 −2 M CaCl 2 and ∼10 −3 M SiO 2(aq). The experimental solutions were reacted with synthetic uranophane and analyzed periodically over 10 weeks. Interpretation of the aqueous solution data permitted extraction of a solubility constant for the uranophane dissolution reaction ( log K sp o = 11.01 ± 0.09 ) and standard state Gibbs free energy of formation for uranophane ( Δ G f o = - 6196.1 ± 0.5 kJ mol −1).
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