Discussion
What does a flame ionisation detector respond to?
Answer: A
Organic carbon burning in a hydrogen air flame produces ions in numbers roughly proportional to the mass of carbon entering, and the collected current is the signal. That makes it very nearly a carbon counter, which is exactly what a total hydrocarbon measurement wants. It is not a calorimetric or an optical measurement, and the small temperature change is incidental. Its blindness to water, carbon dioxide and the permanent gases is another virtue in exhaust and stack work.
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