Hydrogen can be detected in TCD when the carrier gas is Helium, but the response is very low due to the thermal conductivity of Hydrogen (0.1805 W·m−1·K−1) and Helium (0.1513 W·m−1·K−1) were very near.
Thermal conductivity of Argon 17.72×10−3 W·m−1·K−1, very far from Hydrogen thermal conductivity. Thats why generally Argon carrier gas was used in TCD for Hydrogen detection and well response.
Source of Thermal conductivity values: Wikipedia
Hydrogen can be detected in TCD when the carrier gas is Helium, but the response is very low due to the thermal conductivity of Hydrogen (0.1805 W·m−1·K−1) and Helium (0.1513 W·m−1·K−1) were very near.
Thermal conductivity of Argon 17.72×10−3 W·m−1·K−1, very far from Hydrogen thermal conductivity. Thats why generally Argon carrier gas was used in TCD for Hydrogen detection and well response.
Source of Thermal conductivity values: Wikipedia
When you are using TCD, the main role is the difference in thermal conduction of the sample gas and the carrier gas. thats how your detector detects the sample gas. the difference between He and H2 thermal conduction is very low therefor you should use another carrier like nitrogen. and you cannot use FID detector cause it doesn't detect hydrogen.
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