28-12. In adsorption chromatography, separations are based on adsorption equilibria between
the components of the sample and a solid surface. In partition chromatography,
separations are based on distribution equilibria between two immiscible liquids.
28-13. In size-exclusion chromatography separations are based upon the size, and to some extent
the shape, of molecules with little interactions between the stationary phase and the sample components occurring. In ion-exchange chromatography, in contrast, separations are based upon ion-exchange reactions between the stationary phase and the components of the sample in the mobile phase.