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23 Cards in this Set
- Front
- Back
Adsorption
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The attraction of one substance to the surface of another.
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calibration graph
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A plot of data involving two variables that is used to determine values for one of the variables.
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carrier gas
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The gas used as the mobile phase in gas chromatography.
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chromatogram
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The trace or plot that is obtained when the components of a mixture are separated by chromatography.
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chromatography
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A technique for separating the components of a mixture. The components are carried by a mobile phase (gas or liquid) over the adsorbent surface of a stationary phase, which can be solid or liquid.
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column chromatography
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A chromatographic technique in which the stationary phase is contained in a column, as for example in gas chromatography.
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desorption
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The breaking of the bonds between a substance and the surface to which the substance is adsorbed.
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eluent
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A liquid used as the mobile phase in chromatography.
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flame ionisation detector
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A device used to identify organic compounds leaving a GC column. The compounds are burnt in a hydrogen–oxygen flame and are attracted to electrodes, creating an electric current.
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gas chromatography(GC)
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A form of chromatography in which the mobile phase is a gas. It includes the techniques of gas–liquid chromatography and gas–solid chromatography.
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high performance (or pressure) liquid chromatography
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A very sensitive form of chromatography in which the mobile solvent phase is pumped through the stationary phase under high pressure.
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injection point
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The part of an analytical instrument into which a sample is injected.
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liquid stationary phase
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A viscous liquid used as the stationary phase in chromatography. The components of a mixture undergo adsorption to this liquid as they are carried along by the mobile phase.
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mobile phase
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The phase that moves over the stationary phase in chromatography.
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origin
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The point at which a small spot of a mixture is placed so that it can be separated by thin-layer chromatography.
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retention time
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The time taken for a component to pass through a chromatography column.
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sample cell
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A cell in an analytical instrument that contains the sample to be analysed.
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solid stationary phase
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An adsorbent solid such as alumina or activated charcoal which is used as the stationary phase in chromatography. The components of a mixture undergo adsorption to this solid as they are carried along by the mobile phase.
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solvent
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A liquid in which other substances dissolve.
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solvent front
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The point reached by the mobile phase as it moves along the stationary phase in thin-layer chromatography.
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standards
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Chemicals of known composition used for comparison.
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stationary phase
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A solid, or a solid that is coated in a viscous liquid, used in chromatography. The components of a mixture undergo adsorption to this phase as they are carried along by the mobile phase.
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thin-layer chromatography(TLC)
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Chromatography using as the stationary phase a thin layer of fine powder spread on a glass or plastic plate.
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