The prediction of mineral solubilities in natural waters: A chemical equilibrium model for the Na-K-Ca-Cl-SO 4 -H 2 O system to high concentration from 0 to 250°C

Details The prediction of mineral solubilities in natural waters: A chemical equilibrium model for the Na-K-Ca-Cl-SO 4 -H 2 O system to high concentration from 0 to 250°C The prediction of mineral solubilities in natural waters: A chemical equilibrium model for the Na-K-Ca-Cl-SO 4 -H 2 O system to high concentration from 0 to 250°C

Oct 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989gecoa..53.2503g&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 53, Issue 10, pp.2503-2518

Computer Science

10

Scientific paper

A chemical equilibrium model is described which is used to calculate solubilities within experimental uncertainties in the Na-K-Ca-Cl-SO 4 -H 2 O system from zero to high ionic strength and from 0 to 250°C. This model is an expansion of the variable temperature Na-Ca-Cl-SO 4 -H 2 O model of (1988). It is parameterized by fitting available osmotic and solubility data in all common ion systems involving the potassium ion: Na-K-Cl-H 2 O, Na-K-SO 4 -H 2 O, K-Cl-SO 4 -H 2 O, K-Ca-Cl-H 2 O, and K-Ca-SO 4 -H 2 O. Limitations of the model due to data insufficiencies are discussed and comparisons of model calculations with the available data are given. Model predictions for solubility in the complex reciprocal systems, Na-K-Cl-SO 4 -H 2 O and K-Ca-Cl-SO 4 -H 2 O, are compared with experiment. Data for the two systems were available only in the temperature ranges 0-100°C and 25-55°C, respectively. The phase diagram predicted for the halite-saturated Na-K-Ca-Cl-SO 4 -H 2 O quinary system at 100°C is also presented. This model will be used to extend the et al. (1984) model for the Na-K-Ca-Mg-Cl-SO 4 -CO 2 -H 2 O seawater system to high temperature.

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