Uranophane dissolution and growth in CaCl2-SiO2(aq) test solutions |
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Authors: | James D. Prikryl |
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Affiliation: | Center for Nuclear Waste Regulatory Analyses Southwest Research Institute®, 6220 Culebra Road, San Antonio, TX 78238, USA |
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Abstract: | The dissolution and growth of uranophane [Ca(UO2)2(SiO3OH)2·5H2O] 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 CaCl2 and ∼10−3 M SiO2(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 and standard state Gibbs free energy of formation for uranophane ( kJ mol−1). |
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