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23 Cards in this Set

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