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Thermodynamic properties of SiO$$_{2(aq)}$$, HSiO$$_{3}$$$$^{-}$$ and SiO$$_{3}$$$$^{2-}$$

Walker, C.*; Anraku, Sohtaro; Oda, Chie  ; Mitsui, Seiichiro  ; Mihara, Morihiro  

Equilibrium constants (${it K}$) describing the formation reactions of SiO$$_{2(aq)}$$, HSiO$$_{3}$$$$^{-}$$ and SiO$$_{3}$$$$^{2-}$$ can be used to derive their thermodynamic properties. However, SiO$$_{2(aq)}$$ was derived from inaccurate quartz solubility data, HSiO$$_{3}$$$$^{-}$$ was not extrapolated to zero ionic strength and SiO$$_{3}$$$$^{2-}$$ is routinely ignored because of its restricted dominance to very high pH $$>$$ 13 solutions. Using quartz and water data as well known "anchor" points, ${it K}$ values describing the formation reactions of SiO$$_{2(aq)}$$, HSiO$$_{3}$$$$^{-}$$ and SiO$$_{3}$$$$^{2-}$$ were revised to derive new thermodynamic properties and revised Helgeson-Kirkham-Flowers equation of state (r-H-K-F EoS) parameters. These properties and parameters can be used in the derivation of the thermodynamic properties of other Si bearing aqueous species/complexes and the thermodynamic properties of cementitious, clay, zeolite, and rock forming minerals, and in calculating groundwater compositions relevant to the geological disposal of radioactive wastes.

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