Gas chromatography

  • gas chromatography
  • A separation technique involving passage of a gaseous moving phase through a column containing a fixed phase; it is used principally as a quantitative analytical technique for volatile compounds.
Abstract from DBPedia
    Gas chromatography (GC) is a common type of chromatography used in analytical chemistry for separating and analyzing compounds that can be vaporized without decomposition. Typical uses of GC include testing the purity of a particular substance, or separating the different components of a mixture. In preparative chromatography, GC can be used to prepare pure compounds from a mixture. Gas chromatography is also sometimes known as vapor-phase chromatography (VPC), or gas–liquid partition chromatography (GLPC). These alternative names, as well as their respective abbreviations, are frequently used in scientific literature. Gas chromatography is the process of separating compounds in a mixture by injecting a gaseous or liquid sample into a mobile phase, typically called the carrier gas, and passing the gas through a stationary phase. The mobile phase is usually an inert gas or an unreactive gas such as helium, argon, nitrogen or hydrogen. The stationary phase is a microscopic layer of viscous liquid on a surface of solid particles on an inert solid support inside a piece of glass or metal tubing called a column. The surface of the solid particles may also act as the stationary phase in some columns. The glass or metal column through which the gas phase passes is located in an oven where the temperature of the gas can be controlled and the eluent coming off the column is monitored by a computerized detector.

    ガスクロマトグラフィー (Gas Chromatography, GC) はクロマトグラフィーの一種であり、気化しやすい化合物の同定・定量に用いられる機器分析の手法である。サンプルと移動相が気体であることが特徴である。ガスクロマトグラフィーに用いる装置のことをガスクロマトグラフという。また、ガスクロとも呼称される。 測定感度は高感度な検出器を用いれば市販品でも数十fg/s(フェムトグラム毎秒)オーダーレベルにまで及ぶ。各種の科学分野で微量分析技術として汎用されている。