A thermodynamic model for the solubility of barite and celestite in natural waters from 0 to 200°C and to 1 kbar

Monnin and Galinier (Chem. Geol., 71, 283-296, 1988) have proposed a predictive model for the solubility of barite and celestite in electrolyte solutions to high concentrations at 25°C based on Pitzer’s ion interaction model. They have demonstated the limited influence of the binary interaction parameters for these slightly soluble salts at room temperature. Literature data for barite and celestite solubilities in NaCl, KCl, CaCl 2 and MgCl 2 solutions are used here to show that this hypothesis holds to 200°C and to 1 kbar.