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Which of the following is not used as a heating element in a Thermal conductivity detector?

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Which of the following is not used as a heating element in a Thermal conductivity detector?

(a) Platinum

(b) Gold

(c) Graphite

(d) Tungsten wire

The question was posed to me during an interview.

The above asked question is from Detection System of Gas Chromatography topic in portion Chromatography of Analytical Instrumentation

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The correct option is (c) Graphite

Explanation: Graphite is not used as a heating element in Thermal conductivity detector. Platinum, gold and tungsten wire are used as heating elements.

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