In any chromatography, there is a mobile phase and a stationary phase. In GC, the gas is a mobile phase and the column is a stationary phase. Different types of columns can be used for different fields, it depends on the type of samples usually packed and capillary columns are used in GC.
The capillary column contains two parts, a tube and a stationary phase. Capillary columns are available in lengths from 30 to 60 meters, thin film from 0.1 to 10.0 µm and inner wall diameter from 0.05 to 0.53 mm. ID With a high molecular weight and thermally stable polymer coated on the wall. Packed columns have a layer of solid, inert, well-partitioned support material with the liquid stationary phase. Packed columns generally have a length of 1.5 to 10 m and an internal diameter of 2 to 4 mm.
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