【Daily Question】Chemical Analysis Edition 2021.1.29
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This post was last edited by zjp on 2021-1-29 08:50. Multiple-choice question: When using gas chromatography to determine the H2 content in a mixed gas, which carrier gas should be selected? A、H2 B、N2 C、He D、CO2 Answer: B
Due to its low diffusion coefficient and high column efficiency, nitrogen is commonly used as a carrier gas in detectors other than TCD. It is used less in TCD mainly because the nitrogen heat conduction system has a small size and low sensitivity; however, when analyzing H2, N2 must be used as the carrier gas, otherwise TCD cannot be employed to address the analysis of H2.