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In flame ionization detectors, which of the following is the range adequate for atmospheric sampling?

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In flame ionization detectors, which of the following is the range adequate for atmospheric sampling?

(a) 0-1 ppm

(b) 0-2 ppm

(c) 0-20 ppm

(d) 0-100 ppm

This question was posed to me in examination.

My question is from Estimation of Hydrocarbons in section Pollution Monitoring Instruments of Analytical Instrumentation

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Right option is (c) 0-20 ppm

The best I can explain: In flame ionization detectors, the range adequate for atmospheric sampling is 0-20ppm. It is useful for detecting organic compounds.

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