The solubility of calcite,strontianite and witherite in NaCl solutions at 25°C |
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Authors: | Frank J. Millero Peter J. Milne Valerie L. Thurmond |
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Affiliation: | Rosenstiel School of Marine and Atmospheric Science, University of Miami, Miami, Florida 33149 USA |
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Abstract: | 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 and 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 . |
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