Gas chromatography.

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chromatography

Can be used to sperate different substances.

these substances then can be identified.

Machines-for the analysis of unknown substances.

very sensitive,

very fast,

very accurate.

gas chromatography-

Gas carries a substance through the column,

Different substances travel at different speeds so reach the detector at different times.

The retention time can be used with a mass spectrometer to identify substances. (GC-MS)

chemical analysis and instrumental methods.

see the revision guide page 56/57

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