Working principle, chromatographic detector

A standard arrangement for sampling gaseous products downstream of the reactor is shown in Fig. 5. In a needle valve (or a similar device), the reactor effluent is depressurized and the flow rate is controlled. In the vast majority of cases, the analytical instrument of the choice will be a gas chromatograph equipped with a capillary column, because such an instrument often allows a good separation of the products and, if equipped with an appropriate detector, a reliable quantitative analysis of these products. The working principle of gas chromatography, however, is inherently... 

In addition, chromatographic detectors can be classified according to their working principles, eg, light emission/absorption or ionization mechanisms. 

Working Principle and Application Range of Selected Chromatographic Detectors... 

The boom in microanalysers started aroimd 1994. Laborious sample treatment procedures and other peripheral operations were performed in reactor columns connected upstream or downstream from the central part. Highly efficient instruments, like a miniature mass spectrometer, became available. Amperometric detectors became the standard device for flow systems since they could be miniaturized easily. They are foimd primarily in liquid chromatographic /i-TASs as well as in such systems which work on the principle of capillary electrophoresis. 

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