Gas-liquid chromatographic determination of partial molar free energies at infinite dilution of 18 organic solutes in n-hexane solvent at 25.0.degree.

Measurement of limiting activity coefficients using non-steady-state gas chromatography

“…Conventional gas-liquid chromatography (GC) has often been used to measure the infinite dilution values of volatile solutes in a stationary phase (Conder and Young, 1979), but the low volatility of the solvent restricts application to systems primarily of theoretical interest. Volatile solvents have been studied by GC by presaturating the carrier gas with solvent vapors (Mash and Pemberton, 1980;Eckert et al, 1981;Thomas et al, 1982;Thomas and Eckert, 1984;Palmer, 1984; Terasawa et al, 1986;Itsuki et al, 1987). However, the weight of solvent phase present in the column is never known accurately; either the column has to be removed and weighed after a series of measurements, or the solvent weight has to be calculated based on the retention volume of a solute of independently known activity coefficient.…”