Gas Chromatography (GC) Detectors
After the components of a mixture are separated using gas chromatography, they must be detected as they exit the GC column. The links listed below provide the details of some specific GC detectors. The thermal-conductivity (TCD) and flame-ionization (FID) detectors are the two most common detectors on commercial gas chromatographs. The requirements of a GC detector depends on the separation application. For example, one analysis might require a detector that is selective for chlorine-containing molecules, another analysis might require a detector that is non-destructive so that the analyte can be recovered for further spectroscopic analysis.
Specific GC detectors
- Atomic-emmision detector (AED)
- Chemiluminescence detector
- Electron-capture detector (ECD)
- The ECD is as sensitive as the FID but has a limited dynamic range and finds its greatest application in analysis organic molecules that contain electronegative functional groups, such as halogens, phosphorous, and nitro groups.
- Flame-ionization detector (FID)
- The FID is extremely sensitive with a large dynamic range, its only disadvantage is that it destroys the sample.
- Flame-photometric detector (FPD)
- Photoionization detector (PID)
- Thermal conductivity detector (TCD)
- The TCD is not as sensitive as other dectectors but it is non-specific and non-destructive.
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Copyright © 1996 by Brian M. Tissue
/chem-ed/sep/gc-det.htm, updated 6/13/96