The gas samples, either evolved gas collected using the drainage method or dissolved gas obtained through vacuum degassing, are introduced into the gas chromatograph. A carrier gas is then used to push the sample through a chromatographic column, where the different gas components are separated based on their interaction with the stationary phase. After separation, the gases enter a thermal conductivity detector, which measures changes in thermal conductivity and generates a signal. This signal is recorded as a chromatogram. The concentration of each gas component is determined by analyzing the peak height or peak area using the external standard method. Calibration curves are prepared using known concentrations of reference gases, allowing for accurate quantification of the unknown sample. This process ensures reliable and precise determination of the gas composition in the sample.
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