Structure of gas-chromatographic apparatus

The gas chromatograph shown schematically in Fig. 40 fulfils the necessary conditions for carrying out the intended substance separations, and enables the analyst to control the separation. The system consists of a carrier-gas source (1), e.g. a pressure cylinder with high-purity nitrogen or helium a pressure-reducing valve and precision adjusting valve ensure that the 

The substances to be separated are transported through the separation column by the carrier gas. The sample mixture enters a partition process between the gas phase and the stationary phase for each component of the 

Gas-chromatographic apparatus 1) = Carrier-gas supply with pressure and/or flow control 2) = Injection system 3) = Column oven with analytical separation column 4) = Detection unit 5) = Recording system with data evaluation 

It must be considered a disadvantage that those components with greater affinity to the stationary phase have a long residence time in the column. 

The technique of temperature programming may be used in order to reduce the elution time temperature programming is the technique of increasing the column temperature during the analysis. 

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