Mixed Solvents in gas-liquid chromatography. Activity coefficients for chloroform, dichloromethane and ehtyl acetate in squalane-dinonyl phthalate mixtures at 303°K

Anthony J. Ashworth, Gareth J. Price

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Activity and partition coefficients for the polar solutes chloroform, dichloromethane and ethyl acetate at infinite dilution in squalane-dinonyl phthalate mixtures have been determined at 303°K by the extrpolation of measurements made using a vacuum microbalance technique. The results are compared with predictions using the Purnell-Andrade and Tiley-Perry relationships. The effect of solvent-solid support ratios on the determined activity coefficients and the adsorption phenomena involved have been examined. Whereas 20% by weight of solvent yields true bulk liquid activity coefficients for chlorform and dichloromethane, a 40% loading is necessary for ethyl acetate.

Original languageEnglish
Pages (from-to)231-241
Number of pages11
JournalJournal of Chromatography A
Issue numberC
Publication statusPublished - 1 Jan 1985

ASJC Scopus subject areas

  • Analytical Chemistry

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