gas chromatography(GC)

Gas Chromatography

A physical separation method

A physical separation methodA physical separation method

It involves the distribution of componentIt involves the distribution of component
between two phasesbetween two phases


stationary phase

– solid <(10%)

– liquid >(90%)liquid >(90%


mobile phase



Why use GC


Short Analysis Time
– Wide Choice of StationaryWide Choice of Stationary
Wide Choice of DetectorsWide Choice of Detectors
Ease of Operation Ease of Operation




Separation of compounds

When analytes are
introduced into the column, the molecules, distribute, between the stationary and mobile phases.


The molecules in the mobile phase are carried down down the column


Those in the stationary
phase are temporarily immobile and do not move do not move down the column