Adsorption of vapors on a solid adsorbent, with a gas as the only mobile phase, defines gas–solid chromatography (GSC). Unlike gas–liquid chromatography, there is no liquid stationary film; retention is governed by the adsorption isotherm of the solute on carbon, molecular sieves, porous polymers, or inorganic oxides [1]. The same experiment that separates permanent gases and light hydrocarbons also yields adsorption isotherms and surface-energy parameters when the solid is the object of study [2]. Conceptual boundaries exclude gas–liquid (partition) chromatography, inverse gas chromatography when it is used solely as a surface-characterization tool without being identified as GSC, and liquid–solid chromatography. Essential features are a gaseous carrier, a solid adsorbent packing or porous-layer wall, and a temperature at which the solutes remain volatile while adsorption remains reversible. Retention of carbon monoxide, light hydrocarbons, and related gases in packed or multi-bed adsorbent columns follows adsorption rather than partition into a liquid film [3].
- gas–solid chromatography
- adsorption
- solid adsorbent
- permanent gases
Analytical Chemistry and Chromatography • Spectroscopy • Chemistry • Physical Sciences
References
- A.M. Dominguez; H.E. Christensen; L.R. Goldbaum; V.A. Stembridge; A sensitive procedure for determining carbon monoxide in blood or tissue utilizing gas-solid chromatography. Toxicol. Appl. Pharmacol. 1959, 1, 135-143, 10.1016/0041-008x(59)90132-2.
- Fani Roubani–Kalantzopoulou; Determination of isotherms by gas–solid chromatography. J. Chromatogr. A 2004, 1037, 191-221, 10.1016/j.chroma.2003.12.005.
- Mona Lärstad; Carina Loh; Göran Ljungkvist; Anna-Carin Olin; Kjell Torén; Determination of ethane, pentane and isoprene in exhaled air using a multi-bed adsorbent and end-cut gas–solid chromatography. Anal. 2002, 127, 1440-1445, 10.1039/b205994k.