Answer :
Nitrogen is not a suitable carrier gas in a thermal conductivity detector due to its high thermal conductivity, which can interfere with accurate detection and measurement.
The reason why nitrogen is not a suitable carrier gas when using a thermal conductivity detector in gas chromatography is because it has a high thermal conductivity. In a thermal conductivity detector, the detector measures the difference in thermal conductivity between the carrier gas and the sample, and nitrogen has a high thermal conductivity compared to other gases like helium or hydrogen.
Since nitrogen itself has a high thermal conductivity, it can interfere with the detection of subtle differences in thermal conductivity caused by the sample components. This can result in poor sensitivity and inaccurate measurements. Therefore, it is recommended to use gases like helium or hydrogen as carrier gases in thermal conductivity detectors.
In summary, nitrogen is not a suitable carrier gas in a thermal conductivity detector due to its high thermal conductivity, which can interfere with the accurate detection and measurement of sample components' thermal conductivity differences.
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