Other
Scientific paper
Aug 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993gecoa..57.3533h&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 57, Issue 15, pp.3533-3554
Other
11
Scientific paper
CO 2 solubility, and the first and second stoichiometric dissociation constants of carbonic acid ( K 1 * and K 2 * ), have been determined in aqueous solutions containing Cl and SO 4 salts of Na, K, Ca and Mg over a wide range of ionic strength from 0 to 90°C at 0.1032 MPa (1 atm) pressure. Activity coefficients for CO 2(aq) , HCO 3 - and CO 3 2 - ions were calculated from m co 2 , K 1 * and K 2 * . These activity coefficients were then used to derive Pitzer parameters for the interaction between these carbonate species and other ions between 0 and 90 °C. The resulting Pitzer model for the carbonic acid system was verified by its ability to accurately predict experimentally determined calcite solubility in brines from 0 to 90°C. However, calcite solubility measurements in complex brines initially supersaturated with respect to calcite indicate that Na + , Mg 2+ and SO 4 2- ions are probably incorporated into calcite lattice and significantly increase calcite solubility in brines.
He Shiliang
Morse John W.
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