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New data on the solubility of amorphous silica in organic compound-water solutions and a new model for the thermodynamic behavior of aqueous silica in aqueous complex solutions

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Abstract

Experimental solubilities of amorphous silica in several aqueous electrolyte solutions and in aqueous solutions of organic compounds, and theoretical considerations concerning cavity formation, electrostriction collapse, ion solvation, and long- and short-range interaction of the solvated ions with one another(1) permit the calculation of the partial excess free energies and the activity coefficients of aqueous silica. It is shown that, in the case of non-dissociated aqueous organic solutions, the variation of log m (SiO2) with the reciprocal of the dielectric constant of the solution is described by a single linear equation independent of the nature of the organic compound. For aqueous electrolyte solutions, a specific linear relationship between log m (SiO2) and the reciprocal of the dielectric constant occurs for each electrolyte. The success of the equation in reproducing the experimental solubilities of amorphous silica in aqueous solutions of electrolytes and organic compounds supports previous evidence indicating a polar charge distribution in the solvated SiO2 molecule. Our data permit the calculation of the effective local charge of dissolved SiO2 molecules and of the short-range interaction parameters between SiO2 and various ions. The proposed equation of state can be used to calculate the affinity of reactions among SiO2 minerals and complex aqueous solutions.

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Authors and Affiliations

  1. Laboratoire de Minéralogie et Cristallographie, Université Paul-Sabatier, 38 Rue des 36 Ponts, 31062, Toulouse Cedex, France

    Jean-Louis Dandurand & Jacques Schott

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  1. Jean-Louis Dandurand
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  2. Jacques Schott
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Dandurand, JL., Schott, J. New data on the solubility of amorphous silica in organic compound-water solutions and a new model for the thermodynamic behavior of aqueous silica in aqueous complex solutions. J Solution Chem 16, 237–256 (1987). https://doi.org/10.1007/BF00646989

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  • DOI: https://doi.org/10.1007/BF00646989

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