Abstract
An empirical equation for quartz solubility in NaCl solution (up to 20 wt. %) is obtained from the experimental results of Anderson and Burnham (1967), Novgorodov (1978), Hemley et al. (1980), and Fournier et al. (1982). The ratio of quartz solubility in NaCl solution (Saq) to the solubility in pure water (Swatar) under the same pressure-temperature condition can be expressed by the following equation: In (Saq/Swater)=2.54583 ln(ρaqF/ρwater), where Saq and Swater are expressed as molality, ρaq and ρwater designate the densities (g/cm3) of NaCl solution and water, respectively, and F is the weight fraction of water in the solvent. Based on this relationship, the equation for quartz solubility proposed by Von Damm et al. (1991) is modified into the following equation: lnSaq={-2.21703+2 lnF+0.54583 ln (ρaqF/ρwater)}+2 lnρaq+(-2315.71+0.0042138T2) T-1+0.0196606 PT-1, where T and P denote temperature (Kelvin) and pressure (bar), respectively.
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