Adsorption from binary solvent mixtures onto silica gel by HPLC frontal analysis |
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Authors: | F. Köster G. H. Findenegg |
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Affiliation: | (1) Physikalische Chemie II, Ruhr-Universität Bochum, D-4630 Bochum, Federal Republic of Germany |
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Abstract: | Summary The chromatographic technique of frontal analysis is applied to measuring adsorption from binary liquid mixtures by silica gel. The complete adsorption isotherm of a solvent mixture is obtained by measuring the break-through curves for a series of small concentration steps of the mobile phase. This method offers a direct way to determine the composition of the stationary phase in liquid-solid chromatography with mixed mobile phases. The surface excess isotherms of all binary systems formed by benzene, cyclohexane, and 1,2-dichloroethane, at the solution-silica gel interface at 25 °C are presented. The data of the three systems are shown to be thermodynamically mutually consistent. |
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Keywords: | Liquid-solid chromatography Frontal analysis Adsorption from binary mixtures Silica gel Thermodynamics of adsorption |
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