Practice question

What is the primary difference between a flame ionization detector (FID) and a photoionization detector (PID)?

FID can only detect radiation while PID detects chemicals
FID uses a hydrogen flame to ionize organic compounds and is destructive; PID uses UV light and is non-destructive
PID requires a hydrogen fuel source while FID uses batteries only
There is no functional difference between the two instruments

Answer: B — FID uses a hydrogen flame to ionize organic compounds and is destructive; PID uses UV light and is non-destructive

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