“gas chromatography”的概念、定义、翻译、参考文献-科学参考

gas chromatography

Physics

A technique for separating or analysing mixtures of gases by chromatography. The apparatus consists of a very long tube containing the stationary phase. This may be a solid, such as kieselguhr (gas–solid chromatography, or GSC), or a nonvolatile liquid, such as a hydrocarbon oil coated on a solid support (gas–liquid chromatography, or GLC). The sample is often a volatile liquid mixture, which is vaporized and swept through the column by a carrier gas (e.g. hydrogen). The components of the mixture pass through the column at different rates because they adsorb to different extents on the stationary phase. They are detected as they leave, either by measuring the thermal conductivity of the gas or by a flame detector.

Gas chromatography is usually used for analysis; components can be identified by the time they take to pass through the column. It is sometimes also used for separating mixtures. Gas chromatography is often used to separate a mixture into its components, which are then directly injected into a mass spectrometer. This technique is known as gas chromatography–mass spectroscopy or GCMS.

Chemistry

A technique for separating or analysing mixtures of gases by chromatography. The apparatus consists of a very long tube containing the stationary phase. This may be a solid, such as kieselguhr (gas–solid chromatography, or GSC), or a nonvolatile liquid, such as a hydrocarbon oil coated on a solid support (gas–liquid chromatography, or GLC). The sample is often a volatile liquid mixture, which is vaporized and swept through the column by a carrier gas (e.g. hydrogen). The components of the mixture pass through the column at different rates because they adsorb to different extents on the stationary phase. They are detected as they leave, either by measuring the thermal conductivity of the gas or by a flame detector.
Gas chromatography is usually used for analysis; components can be identified by the time they take to pass through the column. It is sometimes also used for separating mixtures.
Gas chromatography is often used to separate a mixture into its components, which are then directly injected into a mass spectrometer. This technique is known as gas chromatography–mass spectroscopy or GCMS.

Geology and Earth Sciences

Analytical technique in which the components of a sample are separated by partitioning between either a mobile gas and a thin layer of non-volatile liquid held on a solid support (gas–liquid chromatography), or between the gas and a solid absorbent as the stationary phase (gas–solid chromatography). Partitioning occurs repeatedly throughout the column, and, as each solute travels at its own rate, a band corresponding to each solute will form. Solutes are eluted (washed out) in increasing order of partition ratio, and enter a detector attached to the column exit. The time of emergence of a peak on the display identifies a component, and the area under each peak is proportional to the component’s concentration. Gas chromatography is used mainly in the analysis of volatile organic compounds.

单词	gas chromatography
释义	gas chromatography Physics A technique for separating or analysing mixtures of gases by chromatography. The apparatus consists of a very long tube containing the stationary phase. This may be a solid, such as kieselguhr (gas–solid chromatography, or GSC), or a nonvolatile liquid, such as a hydrocarbon oil coated on a solid support (gas–liquid chromatography, or GLC). The sample is often a volatile liquid mixture, which is vaporized and swept through the column by a carrier gas (e.g. hydrogen). The components of the mixture pass through the column at different rates because they adsorb to different extents on the stationary phase. They are detected as they leave, either by measuring the thermal conductivity of the gas or by a flame detector. Gas chromatography is usually used for analysis; components can be identified by the time they take to pass through the column. It is sometimes also used for separating mixtures. Gas chromatography is often used to separate a mixture into its components, which are then directly injected into a mass spectrometer. This technique is known as gas chromatography–mass spectroscopy or GCMS. Chemistry A technique for separating or analysing mixtures of gases by chromatography. The apparatus consists of a very long tube containing the stationary phase. This may be a solid, such as kieselguhr (gas–solid chromatography, or GSC), or a nonvolatile liquid, such as a hydrocarbon oil coated on a solid support (gas–liquid chromatography, or GLC). The sample is often a volatile liquid mixture, which is vaporized and swept through the column by a carrier gas (e.g. hydrogen). The components of the mixture pass through the column at different rates because they adsorb to different extents on the stationary phase. They are detected as they leave, either by measuring the thermal conductivity of the gas or by a flame detector. Gas chromatography is usually used for analysis; components can be identified by the time they take to pass through the column. It is sometimes also used for separating mixtures. Gas chromatography is often used to separate a mixture into its components, which are then directly injected into a mass spectrometer. This technique is known as gas chromatography–mass spectroscopy or GCMS. Geology and Earth Sciences Analytical technique in which the components of a sample are separated by partitioning between either a mobile gas and a thin layer of non-volatile liquid held on a solid support (gas–liquid chromatography), or between the gas and a solid absorbent as the stationary phase (gas–solid chromatography). Partitioning occurs repeatedly throughout the column, and, as each solute travels at its own rate, a band corresponding to each solute will form. Solutes are eluted (washed out) in increasing order of partition ratio, and enter a detector attached to the column exit. The time of emergence of a peak on the display identifies a component, and the area under each peak is proportional to the component’s concentration. Gas chromatography is used mainly in the analysis of volatile organic compounds.
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