Abstract
Adsorption of alicyclic thiophene derivatives from water-acetonitrile and n-hexane-dichloromethane solutions on porous graphitic carbon was studied by HPLC. Retention factors, the Henry adsorption constants, and the standard molar Gibbs energies were determined. The influence of the molecular surface area of the thiophene derivatives on the Gibbs energy of adsorption was discussed. A linear correlation between the Gibbs energy of adsorption from water-acetonitrile and that of adsorption from n-hexane-dichloromethane was found. It was assumed that the retention mechanisms for the thiophene heterocycles eluted with the mixed solvents water-acetonitrile and n-hexane-dichloromethane could be similar when HPLC on porous graphitic carbon is used.
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