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The solubility of ethane in aqueous solutions of sodium 1-pentanesulfonate, sodium 1-hexanesulfonate, sodium 1-heptanesulfonate, and sodium 1-octanesulfonate at 25 degrees C.

Journal of colloid and interface science (2007-03-03)
A R Calhoun, A D King
ABSTRACT

Measurements have been made to determine the solubility of ethane, C2H6, in aqueous solutions of four different surfactants of the linear alkanesulfonate class at 25 degrees C. The surfactants, sodium 1-pentanesulfonate, sodium 1-hexanesulfonate, sodium 1-heptanesulfonate, and sodium 1-octanesulfonate, all share a common head group (-SO-3) and counter ion (Na+), and differ only in the length of the alkyl chain attached to the head group. The solubility of ethane has been determined as a function of surfactant concentration for each surfactant. At surfactant concentrations below the critical micelle concentration (CMC), the solubility of ethane is quite low and differs only slightly from the solubility of ethane in pure water. At concentrations greater than the CMC, the solubility of ethane exhibits a gradual increase with surfactant concentration. At high surfactant concentrations, well in excess of the CMC, the solubility of ethane is found to increase as a linear function of surfactant concentration. From this data it becomes possible to determine the fractional population of the surfactant in the free and micellized states. The solubility data measured for ethane is interpreted in terms of the mass-action model for micelle formation.

MATERIALS
Product Number
Brand
Product Description

Supelco
Sodium 1-pentanesulfonate solution, suitable for ion pair chromatography, LiChropur, concentrate, ampule
Supelco
Sodium 1-octanesulfonate solution, suitable for ion pair chromatography, LiChropur, concentrate, ampule
Sigma-Aldrich
Sodium pentanesulfonate, BioXtra
Sigma-Aldrich
Sodium pentanesulfonate, ≥95% (elemental analysis)
Sigma-Aldrich
Sodium hexanesulfonate, ≥98% (elemental analysis)
Sigma-Aldrich
Sodium hexanesulfonate, BioXtra
Sigma-Aldrich
1-Octanesulfonic acid sodium salt, BioXtra
Sigma-Aldrich
1-Octanesulfonic acid sodium salt, ≥98%
Supelco
Sodium 1-hexanesulfonate monohydrate, suitable for ion pair chromatography, LiChropur, ≥99.0% (T)
Supelco
Sodium 1-hexanesulfonate solution, suitable for ion pair chromatography, concentrate, LiChropur, ampule
Sigma-Aldrich
Sodium 1-hexanesulfonate monohydrate, ≥98.0% (T)
Sigma-Aldrich
Sodium 1-heptanesulfonate
Sigma-Aldrich
Sodium 1-heptanesulfonate, Redi-Dri, free-flowing