Solubility of cyclooctasulfur in pure water and sea water at different temperatures

A. Kamyshny*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

62 Scopus citations


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.

Original languageAmerican English
Pages (from-to)6022-6028
Number of pages7
JournalGeochimica et Cosmochimica Acta
Issue number20
StatePublished - 15 Oct 2009
Externally publishedYes


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