Charged molecules in the liquid phase pass through the column until a binding site in the stationary phase appears. The molecule will not elute from the column until a solution of varying pH or ionic strength is passed through it. The most common detectors used in this type of chromatography are thermal conductivity and flame ionization detectors. The sample in the column is heated until the components vaporize. Because a specific type of molecule possesses a characteristic size and boiling point, each chemical compound is carried through the column at different times.
Retention time is a specific behavior for every compound.
Therefore, comparing sample RT with standard RT, the compounds are identified and quantified. Gas adsorption chromatography involves a packed bed comprised of an adsorbent used as the stationary phase. Common adsorbents are zeolite, silica gel and activated alumina. This method is commonly used to separate mixtures of gases. Gas-liquid chromatography is a more common type of analytical gas chromatography.