Carbonate minerals thermodynamic properties

Eh are usually less than 10 M because of the extremely low solubilities of these solids. In the U(V) oxidation state, uranium occurs as the UOJ ion which forms relatively weak complexes (Grenthe et al. 1992). This species is only found at intermediate oxidation potentials and low pH s and is unstable relative to U(IV) and U(VI). In oxidized surface- and groundwater-uranium is transported as highly soluble uranyl ion (UOf ) and its complexes, the most important of which are the carbonate complexes. The thermodynamic properties of these minerals and aqueous species must be known if we are to understand the reactions that may control U concentrations in natural waters. 

Rozov, K. B., U. Berner, D. A. Kulik and L. W. Diamond (2011). Solubility and thermodynamic properties of carbonate-bearing hydrotalcite-pyroaurite solid solutions with a 3 1 Mg/(A1+Fe) mole ratio . Clays and Clay Minerals 59(3) 215-232. 

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