Carrier gas by gas chromatography

Typically, nitrogen and helium are used as carrier gases; Argon and carbon dioxide are also used as carrier gases for gas chromatography. The selection of carrier gases often depends on the type of detector used in the system.

Hydrogen and helium are commonly used in traditional detectors such as flame ionization, electron capture, and thermal conductivity. The carrier gas plays an important role in GC, it must be dry, chemically inert, more oxygen-free and at least 99.99% pure.

The gas system contains a molecular sieve and trap system to remove other impurities, water and contaminants to maintain system purity.