Contribution to the study of solute-stationary phase retention interactions in terms of activity coefficients obtained by gas–liquid chromatography Original Research Article

A gas–liquid chromatographic recharacterization of the three systems: 15 solutes+OV-101 at 90–200°C, 25 solutes+OV-215 at 90–180°C, and 25 solutes+Superox 20M at 80–140°C, based on activity coefficients has been carried out. Infinite dilution weight fraction activity coefficients ω2∞, athermal, ωat∞, and thermal, ωth∞, activity coefficients, solvation enthalpies, HS, and excess Gibbs energies, GE, enthalpies, HE, and entropies, SE, of mixing were also determined for systems. Results obtained in this work are compared with results reported in the literature. Vg, HS, HE and ω2∞ are reproducible in many cases. Good ωth∞ versus 1/T straight lines are obtained for the majority of solutes. GE, HE and TSE yield acceptable increasing straight lines with increasing connectivity index for n-alkanes+n-alkanols on Superox 20M, and for n-alkanes on OV-101 and OV-215 at 120°C.