Forensic Science: An Illustrated Dictionary
Flame ionization detector (FID)
A nearly universal gas chromatograph detector. It responds to almost all organic compounds.
An FID does not respond to nitrogen, hydrogen, helium, oxygen, carbon monoxide, or water. This detects ionized compounds as they reach the end of the chromatographic column by burning them in an air/hydrogen flame. As the compounds pass through the flame, the conductivity of the flame changes, generating a signal. This is the most commonly used detector in arson debris analysis (Figure F.6).
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