Commonly Nitrogen and Helium use as carrier gases; argon and Carbon dioxide are also used as carrier gases for gas chromatography. The selection of carrier gases often dependent upon the type of detector used in the system.
Hydrogen and Helium are normally used in traditional detectors such as Flame Ionization, electron capture, and thermal conductivity. Carrier gas plays important role in GC it must be dry, chemically inert, freer of oxygen and purity not less than 99.99 %. The gas system contains a molecular sieve and trap system to remove other impurities, water and contaminants to keep the system pure.
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