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Abstract
Is is shown that the interfacial tension between the mobile and the stationary phases reflects the partition properties of the two phases, and this can be taken as a criteria of choice of the systems used in liquid—liquid chromatography. A semi-theoretical treatment shows that the Gibbs free energy of partition of solute between the two phases is quasi-proportional to the surface tension, provided that the solubility of each phase in the other is small. Such behaviour is observed with organic solvent—water systems for solvents that give a surface tension greater than 20–25 dynes/cm. As mixtures of mobile phases behave in the same way, the retention times in programmed gradient analysis can be predicted.
Published Version
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