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The detector is very sensitive towards organic molecules (10-12 g/s, linear range: 106 -107), but relative insensitive to a few small molecules e.g. N2, NOx, H2S, CO, CO2, H2O. If proper amounts of hydrogen/air are mixed, the combustion does not afford any ions. If other components are introduced that contain carbon atoms cations are produced in the effluent stream. The more carbon atoms are in the molecule, the more fragments are formed and the more sensitive the detector is for this compound (-- > response factor). However, due to the fact that the sample is burnt (pyrolysis), this technique is not suitable for preparative GC. In addition, several gases are usually required to operate a FID: hydrogen, oxygen (compressed air), and carrier gas.Many GC instruments are coupled with a mass spectrometer, which is a very good combination. The GC separates the compounds from each other, while the mass spectrometer helps to identify them based on their fragmentation pattern.

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5mo ago

The GC-MS detector is a mass spectrometer that can identify and quantify individual compounds in a sample based on their mass-to-charge ratio, providing a high level of specificity. On the other hand, the FID (Flame Ionization Detector) is a selective detector that measures carbon content in organic compounds based on the ionization of hydrocarbons by a hydrogen-air flame, offering high sensitivity and wide linear range. GC-MS is more suitable for identifying unknown compounds, while FID is better for detecting hydrocarbons and compounds containing carbon.

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Q: Compare between GC ms detector and fid?
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