Topics - Stationary phase
is the part of the chromatographic system though which the mobile phase flows where distribution of the solutes between the phases occurs. The stationary phase may be a solid or a liquid that is immobilized or adsorbed on a solid. In general immobilization by reaction of a liquid with a solid is used in liquid chromatography and absorbtion of a liquid on a solid is used in gas chromatography but there are many exceptions to both of these generalizations. The stationary phase may consist of particles (porous or solid), the walls of a tube (eg. capillary) or a fibrous material (eg paper).