TY - JOUR
T1 - Solubility of cyclooctasulfur in pure water and sea water at different temperatures
AU - Kamyshny, A.
PY - 2009/10/15
Y1 - 2009/10/15
N2 - The solubility of cyclooctasulfur in water and sea water at various temperatures in the range between 4 and 80 °C was determined. Cyclooctasulfur in equilibrium with rhombic sulfur reacted with hot acidic aqueous potassium cyanide to form thiocyanate anion which was measured by anion chromatography. Sulfur solubility in pure water was found to increase with temperature by more than 78 times: from 6.1 nM S8 at 4 °C to 478 nM S8 at 80 °C. The following thermodynamic values for solubilisation of S8 in water were calculated from the experimental data: K° = 3.01 ± 1.04 × 10-8, ΔGr° = 42.93 ± 0.73 kJ mol-1, ΔHr° = 47.4 ± 3.6 kJmol-1, ΔSr° = 15.0 ± 11.7 J mol-1 K-1). Solubility of cyclooctasulfur in sea water was found to be 61 ± 13% of the solubility in pure water regardless of the temperature.
AB - The solubility of cyclooctasulfur in water and sea water at various temperatures in the range between 4 and 80 °C was determined. Cyclooctasulfur in equilibrium with rhombic sulfur reacted with hot acidic aqueous potassium cyanide to form thiocyanate anion which was measured by anion chromatography. Sulfur solubility in pure water was found to increase with temperature by more than 78 times: from 6.1 nM S8 at 4 °C to 478 nM S8 at 80 °C. The following thermodynamic values for solubilisation of S8 in water were calculated from the experimental data: K° = 3.01 ± 1.04 × 10-8, ΔGr° = 42.93 ± 0.73 kJ mol-1, ΔHr° = 47.4 ± 3.6 kJmol-1, ΔSr° = 15.0 ± 11.7 J mol-1 K-1). Solubility of cyclooctasulfur in sea water was found to be 61 ± 13% of the solubility in pure water regardless of the temperature.
UR - http://www.scopus.com/inward/record.url?scp=69849113899&partnerID=8YFLogxK
U2 - 10.1016/j.gca.2009.07.003
DO - 10.1016/j.gca.2009.07.003
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AN - SCOPUS:69849113899
SN - 0016-7037
VL - 73
SP - 6022
EP - 6028
JO - Geochimica et Cosmochimica Acta
JF - Geochimica et Cosmochimica Acta
IS - 20
ER -