Answer :
Thermal conductivity detectors (TCD) in gas chromatography (GC) measure the difference in thermal conductivity between the carrier gas and the solute.
Therefore, the ideal carrier gas should have a low thermal conductivity so that any changes caused by the solute are detectable.
Two carrier gases that are commonly used with TCDs are helium and hydrogen. These gases have low thermal conductivity and are readily available.
Helium is the most commonly used carrier gas in GC because of its inertness and low molecular weight, which allows for faster and more efficient separations.
However, it is also the most expensive of the carrier gases. Hydrogen, on the other hand, is less expensive and has a higher thermal conductivity, which can be advantageous in certain applications. However, it is also more flammable than helium and requires special safety precautions.
Overall, the choice of carrier gas depends on the specific needs of the analysis and the available resources.
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