Basics of GC

Purpose of gas chromatography?


  • Separation of different volatile or semi-volatile chemical compounds in a mixture.
  • Identification or dosage of volatile components of a sample intended to be chemically characterised.

Gas CHROMATOGRAPH is composed of three parts

  • The injector: its role is to introduce into the system the analytes in gaseous form.
  • The separation column: placed in a temperature-regulated oven, the analytes are separated according to their volatilities and affinities for the stationary phase.
  • The detector: delivers a signal proportional to the quantity of analyte or spectral information leading to its identification.
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