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Thermionic emission detector used in gas chromatography is most sensitive to which of the following elements?

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Thermionic emission detector used in gas chromatography is most sensitive to which of the following elements?

(a) Nitrogen

(b) Phosphorous

(c) Halogen

(d) Carbon

I had been asked this question in exam.

I'd like to ask this question from Detection System of Gas Chromatography topic in section Chromatography of Analytical Instrumentation

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Correct choice is (b) Phosphorous

To explain: Thermionic emission detector used in gas chromatography is most sensitive to phosphorous. It is 500 times more sensitive to phosphorous than Flame ionization detector.

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