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Abstract <p>The solubility of NaF<sub>cr</sub> (villiaumite) in water has been experimentally determined for the first time in a wide range of temperatures <i>T</i> = 5‒443°C and pressures <i>P</i> = 1‒1000 bar. At high <i>PT</i> parameters, the solubility is 1.5‒4 times lower than the values predicted by the SUPCRT97 thermodynamic database. Within the HKF model, the thermodynamic properties of NaF<sub>aq</sub> were estimated and the HKF parameters of the basic ion F<sup>–</sup>, necessary for describing its properties in the region of elevated (&gt;100°C) temperatures, were significantly refined. The obtained experimental data allow estimating the maximum possible level of the fluorine concentration in hydrothermal alkaline fluids, which is determined by the solubility of NaF<sub>cr</sub>.</p>

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Solubility of NaFcr in Water at Temperatures of 5‒443°C and the Thermodynamic Properties of F– and NaFaq

  • 期刊论文

  • 发表日期：

    2025年2月1日

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  • M. E. Tarnopolskaia,
  • V. L. Reukov,
  • N. N. Akinfiev,
  • L. Y. Aranovich,
  • A. V. Zotov

摘要

Abstract

The solubility of NaFcr (villiaumite) in water has been experimentally determined for the first time in a wide range of temperatures T = 5‒443°C and pressures P = 1‒1000 bar. At high PT parameters, the solubility is 1.5‒4 times lower than the values predicted by the SUPCRT97 thermodynamic database. Within the HKF model, the thermodynamic properties of NaFaq were estimated and the HKF parameters of the basic ion F–, necessary for describing its properties in the region of elevated (>100°C) temperatures, were significantly refined. The obtained experimental data allow estimating the maximum possible level of the fluorine concentration in hydrothermal alkaline fluids, which is determined by the solubility of NaFcr.