Physics
Scientific paper
Jan 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987gecoa..51...63r&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 51, Issue 1, pp.63-72
Physics
6
Scientific paper
Celestite solubility measurements have been conducted in pure water at temperatures from 10 to 90°C. Equilibrium was achieved with respect to a crystalline solid phase from both undersaturated and supersaturated solutions. The measurements show that the solubility undergoes a maximum near 20°C. Log K values for the solubility reaction are adequately described by the following expression over the temperature range 283.15 to 363.15 K: - logK = -35.3106 + 0.00422837 T +318312 T 2 + 14.99586 log T . The following thennodynamic values for the dissolution reaction of SrSO 4(s) , at 25°C have been derived: G R 0 = 37852 ± 30 J mol -1 H R 0 = -1668±920 J mol -1 S R 0 = -132.6±3.2 JK -1mol -1 Celestite solubility measurements were also determined in NaCl solutions up to 5 m concentration and from 10 to 40°C. These data are in good agreement with the work of StrÜbel (1966), who reports solubility measurements to temperatures of 100°C. The application of the Pitzer relations and the solubility constants determined in this study to calculate celestite solubility in NaCl solutions yields excellent agreement between predicted values and experimental measurements over the entire range of temperature and NaCl concentration conditions. For the limited number of solubility measurements in seawater-type solutions and mixed-salt brines, the agreement using the Pitzer relations is within three percent of the measured solubility.
Armstrong D. K.
Reardon Eric J.
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