Stationary Phase

In gas-liquid chromatography (GLC) the stationary phase is a liquid coated onto a solid support, which may or may not contribute to the separation process, or onto the walls of an open tube. The liquid may also be chemically bonded to the solid or capillary tube (bonded phase) or immobilized on it, e.g. by in situ polymerization (cross-linking) after coating (immobilized phase). In gas-solid chromatography (GSC) the stationary phase is an active solid (e.g. silica, alumina or a polymer). Gas chromatography is always carried out within a tube and the combination of stationary phase and tube is referred to as the column (column chromatography). The stationary phase (liquid + support) may fill the whole inside volume of the tube (packed column) or be concentrated along the inside wall of the tube, leaving an unrestricted path for the mobile phase in the middle of the tube (open-tubular or capillary column).

In open-tubular columns, the liquid stationary phase can be coated onto the essentially unmodified that the only completely reliable method of sample introduction was in the vapour phase, i.e. handling all samples as gases. While this might be true, it is something of a council of perfection and it is likely that syringe injection through a septum will be with us for the foreseeable future.

See also: N/Chromatography: Gas: Column Technology; Historical Development. III/Gas Analysis: Gas Chromatography.

Solar Panel Basics

Solar Panel Basics

Global warming is a huge problem which will significantly affect every country in the world. Many people all over the world are trying to do whatever they can to help combat the effects of global warming. One of the ways that people can fight global warming is to reduce their dependence on non-renewable energy sources like oil and petroleum based products.

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