Gas Chromatography Columns
Gas chromatography columns are of two designs: packed or capillary. Packed columns are typically a glass or stainless steel coil (typically 1-5 m total length and 5 mm inner diameter) that is filled with the stationary phase. Capillary columns are a thin fused-silica (purified silicate glass) capillary (typically 10-100 m in length and 250 Ám inner diameter) that has the stationary phase coated on the inner surface. Capillary columns provide much higher separation efficiency than packed columns but are more easily overloaded by too much sample.
Picture of a packed GC column
Picture of capillary GC column
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/chem-ed/sep/gc/gc-col.htm, updated 6/13/96