The solubility of calcite, strontianite and witherite in NaCl solutions at 25°C

Details The solubility of calcite, strontianite and witherite in NaCl solutions at 25°C The solubility of calcite, strontianite and witherite in NaCl solutions at 25°C

May 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984gecoa..48.1141m&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 48, Issue 5, pp.1141-1143

Physics

Scientific paper

The solubility of CaCO 3 (calcite), SiCO 3 (strontianite), and BaCO 3 (witherite) has been determined in NaCl solutions from 0.1 to 6 m at 25°C. Activity coefficients estimated from Pitzer's equations with higher order interaction terms ( and ) were used to extrapolate the results to infinite dilution. Thermodynamic values of pK sp = 8.46 ± 0.03,9.13 ± 0.03 and 8.56 ± 0.04 were found, respectively, for CaCO 3 , SrCO 3 and BaCO 3 at 25°C. These results are in reasonable agreement with literature data. Since Pitzer parameters for the interactions of CO 3 2- with Ca 2+ , Sr 2+ and Ba 2+ were not used, our results indicate that they are not necessary at low values of P co 2 .

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