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

摘要

A gas-liquid chromatographic recharacterization of the three systems: 15 solutes + OV-101 at 90-200degC, 25 solutes + OV-215 at 90-180degC, and 25 solutes + Superox 20M at 80-140degC, based on activity coefficients has been carried out. Infinite dilution weight fraction activity coefficients #omega#_2~(infinity) , athennal, #omega#_at~(infinity) and thennal, #omega#_th~(infinity) activity coefficients, solvation enthalpies,H~s, and excess Gibbs energies, G~B, enthalpies, H~E , and entropies, SB, of mixing were also detennined for systems. Results obtained in this work are compared with results reported in the literature. V_g, H~S, H~E and #omega#_2~(infinity)are reproducible in many cases. Good #omega#_th~(infinity) 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-a1kanols on Superox 20M, and for n-alkanes on OV-101 and OV-215 at 120degC.