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Chromatography

A chemical analytical technique which utilizes a process of separating gases, liquids, or solids from mixtures or solutions by selective adsorption. Chromatography involves the flow of the gas or liquid sample, which is often dissolved in a carrier solvent (termed the mobile phase), over a solid or liquid adsorbent medium (e.g., silica gel, glass beads, polystyrene gel, alumina, or ion exchange resin), which is often packed in a column and is called the stationary phase. As the mixture flows over the adsorbent medium, each substance adsorbs and desorbs through the medium at different rates, producing distinct bands that can be individually detected and identified. See Also: Gas Chromatograph (GC) Gas Chromatography (GC) Mass Spectrometry (MS) Liquid Chromatography Gas Chromatograph (GC) Gas Chromatography (GC) High Performance Liquid Chromatography (HPLC) Mass Spectrometry (MS) Liquid Chromatography High Performance Liquid Chromatography (HPLC) Liquid Chromatography Gas Chromatograph (GC) Gas Chromatography (GC) High Performance Liquid Chromatography (HPLC) Mass Spectrometry (MS)