Add time:09/09/2019         Source:sciencedirect.com

Publisher SummaryThe chapter presents a schematic gas chromatography (GC) system. An inert carrier gas (for example, nitrogen) flows continuously from a high-pressure cylinder through the injection device, the column, and the detector. The flowrate of the carrier gas is carefully controlled to ensure reproducible retention times and to minimize detector drift and noise. The sample is injected (usually with a microsyringe) into the heated injection port, where it is vaporized and carried onto the column. The sample may also be placed directly on the column (that is, on-column injection), particularly if the compounds are thermolabile. Packed columns consist of glass or stainless-steel tubes, packed tightly with solid particles (the solid support). The solid support is coated uniformly with a thin film of a high-boiling liquid (the stationary phase). Open tubular or capillary columns consist of long, narrow-bore tubes of glass or, more recently, fused silica, where the stationary phase is deposited as a thin film on the inside wall. In both the columns, the sample partitions are between the carrier gas and the stationary phase and are thereby separated into individual components.

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