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

Frank J. Millero, Peter J. Milne, Valerie L. Thurmond

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The solubility of CaCO3 (calcite), SiCO3 (strontianite), and BaCO3 (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 (θ and Ψ) were used to extrapolate the results to infinite dilution. Thermodynamic values of pKsp = 8.46 ± 0.03,9.13 ± 0.03 and 8.56 ± 0.04 were found, respectively, for CaCO3, SrCO3 and BaCO3 at 25°C. These results are in reasonable agreement with literature data. Since Pitzer parameters for the interactions of CO32- with Ca2+, Sr2+ and Ba2+ were not used, our results indicate that they are not necessary at low values of Pco2.

Original languageEnglish (US)
Pages (from-to)1141-1143
Number of pages3
JournalGeochimica et Cosmochimica Acta
Issue number5
StatePublished - May 1984


ASJC Scopus subject areas

  • Geochemistry and Petrology

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