Abstract: The present paper covers a model involving Donnan memhrane equilibrium andadsorption eluilibrium to describe the retention process for diprotic organic acids inion-exclusion chromatography.On this basis the microcomputer simulation of elu-tion behaviour for dicarboxylic acids was investigated.Influences of eluent acidityand sample concentration on the retention value were studied.The theoreticallypredicted results are in reasonable agreement with the experimental data.

Key words: Ion-exclusion chromatography, Elution behaviour, Microcomputer simulation, Dicarboxylic acids