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Prediction of the Thermodynamic Behavior of Aqueous Silica in Aqueous Complex Solutions at Various Temperatures

  • Chapter
Chemical Transport in Metasomatic Processes

Part of the book series: NATO ASI Series ((ASIC,volume 218))

Abstract

Experimental solubilities of amorphous silica in several aqueous electrolyte solutions and in aqueous solutions of organic compounds, and theoretical considerations of cavity formation, electrostriction collapse, ion solvation and long- and short-range interaction of the solvated ions with one another permit the calculation of the partial excess free energy and the activity coefficient of aqueous silica. It is shown that in the case of non-dissociated organic compoundwater solutions, the variation of log \( {m_{Si{O_2}}} \) with the reciprocal of the dielectric constant of the solution is described by a single linear equation whatever the nature of the organic compound. For aqueous electrolyte solutions, a specific linear relationship between log \( {m_{Si{O_2}}} \) and the reciprocal of the dielectric constant occurs for each electrolyte. The success of the theoretical 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 afford the calculation of the effective local charge of dissolved SiO2 molecules and of the short-range interaction parameters between SiO2 and various ions at temperatures up to 350°C.

The proposed equation of state can be used to calculate the chemical affinity of reactions among SiO2-minerals and complex aqueous solutions. As an application, it is shown that this equation allows an accurate prediction of quartz solubility in aqueous solutions of NaCl at temperatures up to 350°C. It is deduced that in this temperature range, quartz and amorphous silica solubilities are consistent with a simple monomeric model for aqueous silica.

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Authors and Affiliations

  1. Laboratoire de Minéralogie et Cristallographie, Université Paul-Sabatier, 38, rue des Trente-six Ponts, 31062, Toulouse Cédex, France

    Jacques Schott & Jean-Louis Dandurand

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  1. Jacques Schott
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  2. Jean-Louis Dandurand
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  1. Department of Geology and Geophysics, University of California, Berkeley, California, 94720, USA

    Harold C. Helgeson

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© 1987 D. Reidel Publishing Company

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Schott, J., Dandurand, JL. (1987). Prediction of the Thermodynamic Behavior of Aqueous Silica in Aqueous Complex Solutions at Various Temperatures. In: Helgeson, H.C. (eds) Chemical Transport in Metasomatic Processes. NATO ASI Series, vol 218. Springer, Dordrecht. https://doi.org/10.1007/978-94-009-4013-0_28

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  • DOI: https://doi.org/10.1007/978-94-009-4013-0_28

  • Publisher Name: Springer, Dordrecht

  • Print ISBN: 978-94-010-8280-8

  • Online ISBN: 978-94-009-4013-0

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