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

• Published in: Analytica chimica acta Vol. 441; no. 1; pp. 63 - 72
• Main Author: Santiuste, José M.
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier B.V 16.08.2001; Elsevier
• Subjects: Activity coefficients; Analytical chemistry; Chemistry; Chromatographic methods and physical methods associated with chromatography; Exact sciences and technology; Excess magnitudes of mixing; Gas chromatographic methods; Gas–liquid chromatography; Solute–solvent interactions; Structural effects; Temperature effect; Activity coefficients; Gas–liquid chromatography; Temperature effect; Structural effects; Excess magnitudes of mixing; Solute–solvent interactions; Structure effect; Heat of mixing; Aliphatic compound; Chromatographic retention; Chain length; Activity coefficient; Theoretical study; Excess parameter; Molecular interaction; Flame ionization detector; Chromatographic properties; Experimental study; Thermodynamic model; Benzenic compound; Gas liquid chromatography; Thermodynamic properties
• ISSN: 0003-2670; 1873-4324
• DOI: 10.1016/S0003-2670(01)01101-1

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 ω 2 ∞, athermal, ω at ∞, and thermal, ω th ∞, activity coefficients, solvation enthalpies, H S, and excess Gibbs energies, G E, enthalpies, H E, and entropies, S E, of mixing were also determined for systems. Results obtained in this work are compared with results reported in the literature. V g, H S, H E and ω 2 ∞ are reproducible in many cases. Good ω th ∞ versus 1/ T straight lines are obtained for the majority of solutes. G E, H E and TS E 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.