Comprises all gas chromatographic methods in which the stationary phase
is an active solid
, molecular sieves). Separation is achieved by adsorption of the components of a sample.
In gas chromatography
the distinction between gas-liquid and gas-solid may be obscure because liquids are
used to modify solid stationary phases, and because the solid supports for liquid
stationary phases affect the chromatographic process. For classification by the phases
used, the term relating to the predominant effect should be chosen.