Capillary GC on 50 micrometer I.D. columns coated with thick films : theory and selected practical results

The chromatographic performance of 50 mu m internal diameter (i.d.) fused silica columns coated with up to 2 mu m films of immobilized SE-54 (methyl phenyl (5%) silicone) is evaluated under gas chromatographic conditions. The influence of pressure drop on the plate height is discussed. In comparison to thick film 250-530 mu m i.d. columns, much higher efficiencies and faster analyses are obtained. Practical examples, performed on a standard GC instrument, illustrate the features of thick film 50 mu m i.d. columns