The precipitation and dissolution of sparingly soluble alkaline earth sulfates play important roles in the establishment of geological equilibria (Davis and Hayes 1986). There is little doubt that there are close relationships among the interfacial tensions between the solid phases and their solutions, the observed solubilities, and the kinetics of crystallization and dissolution. The experimental methods used for investigating the rates of these reactions are reviewed with particular reference to the Constant Composition (CC) technique (Tomson and Nancollas 1978) which enables both crystallization and dissolution reactions to be studied at constant thermodynamic driving forces. Interfacial tensions...

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