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How are the hydrocarbons in the samples removed in magnetic wind instruments?

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How are the hydrocarbons in the samples removed in magnetic wind instruments?

(a) By using a cold trap

(b) By using a filter

(c) By using a semipermeable membrane

(d) By using magnetic effect

This question was addressed to me in an online quiz.

The question is from Magnetic Wind Instruments topic in chapter Industrial Gas Analysers of Analytical Instrumentation

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Right choice is (a) By using a cold trap

To elaborate: The hydrocarbons in the samples are removed in magnetic wind instruments by using a cold trap. It is removed to avoid combustion.

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