Discussion
Why does a flame ionisation detector give almost no response to carbon dioxide?
Answer: B
The detector counts carbon that can still be oxidised, and fully oxidised carbon produces essentially no ions in the flame, so carbon dioxide, carbon monoxide, water and the permanent gases are all invisible. That selectivity for organic carbon is what allows a total hydrocarbon reading to be taken from a wet, carbon dioxide rich exhaust without any conditioning beyond a heated line. Mass transport, quenching and scrubbing are not the mechanism.
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