Quartz solubility at low temperatures

Details Quartz solubility at low temperatures Quartz solubility at low temperatures

Jul 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997gecoa..61.2553r&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 61, Issue 13, pp.2553-2558

Physics

19

Scientific paper

New quartz solubility measurements in pure water that approached equilibrium from under-saturation at 21, 50, 74, and 96°C were combined with critically selected quartz solubility data from the literature to create a revised solubility function for the temperature range 0-300°C: log M = -1107.12(±10.77)/ T - 0.0254(±0.0247) where m is the molal solubility and T is in Kelvins. This function predicts 11.0±1.1 ppm as the solubility of quartz at 25°C. All uncertainties are ±1 standard deviation. Revised thermodynamic properties of H 4 SiO 4 based on this function are: G f o (H 4 SiO 4 )= -1309.231 ± 0.610 kJ/mol; H f o (H 4 SiO 4 ) = -1460.913 ± 0.542 kJ/mol; S °(H 4 SiO 4 ) = 180.87 ± 0.49 J/mol K. The G f o (H 4 SiO 4 ) agrees well with the value of -1309.342 kJ/mol calculated from amorphous silica solubility of 116 ppm at 25°C. In addition, this new solubility function predicts low temperature quartz solubility values that are in good agreement with dissolved silica concentrations found in ancient groundwaters.

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