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• W2000225404 abstract "A model is presented which is used to calculate the effect of pressure on activity coefficients of aqueous solutes in the system Na-Ca-Cl-SO4-H2O to 200°C. Literature data for the density and compressibility of aqueous binary solutions of Na2SO4 and CaCl2 to 200°C are used to calculate the first and second pressure derivatives of Pitzer's ion interaction model parameters, as well as the standard molal compressibility and volume of these two salts. Empirical correlations between the apparent molal volume and compressibility of the aqueous electrolytes are used to guide the choice of the temperature dependent expressions used for the numerical representation of the derivatives of Pitzer's parameters with respect to pressure. For sodium sulfate solutions, such correlations are used to extrapolate compressibilities to 200°C. The change in the thermodynamic properties of the-CaSO04 ion pair with pressure is taken into account by the variation of its dissociation constant. The volumetric properties (partial molal volumes and compressibilities) of multicomponent solutions in the Na-Ca-Cl-SO4-H2O system can be predicted from the information generated here and the volumetric equations of Rogers and Pitzer (1982) for NaCl. This model is then combined with the high temperature model of Moller (1988) of the same system in order to calculate activity coefficients at high pressures to 200°C. The resulting model is validated by comparing calculated and measured solubilities of anhydrite and gypsum in pure water and in NaCl solutions up to 6 M. The agreement between the calculated and measured solubilities of the calcium sulfates is typically better than 10% up to 200°C and 1 kbar. The relevance of temperature and pressure corrections to the activity coefficients of aqueous solutes is discussed in regard to the assumed accuracy with which geochemical models are able to calculate mineral solubilities." @default.
• W2000225404 created "2016-06-24" @default.
• W2000225404 creator A5061066561 @default.
• W2000225404 date "1990-12-01" @default.
• W2000225404 modified "2023-10-06" @default.
• W2000225404 title "The influence of pressure on the activity coefficients of the solutes and on the solubility of minerals in the system Na-Ca-Cl-SO4-H2O to 200°C and 1 kbar and to high NaCl concentration" @default.
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• W2000225404 doi "https://doi.org/10.1016/0016-7037(90)90284-r" @default.
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