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The partition model of retention is developed for reversed phase liquid chromatography with multicomponent mobile phases. Simple equations for the retention and selectivity in ternary mobile phases are derived. For the systems in which the ratio of volume fractions of organic modifiers remains fixed, new linear dependences for retention factor and selectivity are proposed. These equations are successfully used to describe experimental data found in the literature. An influence of the nature of organic solvents and proportion in which they are mixed on retention and selectivity is discussed.

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A theoretical model for adsorption of a binary solution in a slit shaped pore is proposed. The classic lattice model of the solution is used. Adsorption systems exhibiting complete mixing are considered. The theoretical results are compared with Monte Carlo simulations in the grand canonical ensemble. An influence of pore size and nonideality of the liquid mixture on adsorption and selectivity is analysed.

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