| chromatography |
any of a diverse group of techniques used to separate mixtures of substances based on differences in the relative affinities of the substances for two different media, one (the mobile phase) a moving fluid and the other (the stationary phase or sorbent) a porous solid or gel or a liquid coated on a solid support; the speed at which each substance is carried along by the mobile phase depends on its solubility (in a liquid mobile phase) or vapor pressure (in a gas mobile phase) and on its affinity for the sorbent.
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