I am trying to analyze a biogas sample using gas chromatography. The report in my GC shows area and area percentages. How do I calculate the concentration of each component of the biogas from the area obtained from the report?
Raw biogas typically consists of methane (50–75%), carbon dioxide (25–50%), and smaller amounts of nitrogen (2–8%). Trace levels of hydrogen sulfide, ammonia, hydrogen, and various volatile organic compounds are also present in biogas depending on the feedstock.
Konstandt (1976) mentioned that the percentage of methane CH4 can be estimated through recognition of CO2 percentage from this equation: CH4 = 100% - [CO2% + 0.2% H2S] vol.
Regards
Dear Hemraj,
You can use some gas mix standards from available suppliers (Ex Restek ), Then you can calibrate the area response with the respective percentage of the component (CH4, CO2, N2, O2).
When you develop a calibration curve with respect to area response, you can obtain linear regression for each component.
From the linear regression equation or from the plot, you can obtain the percentage for unknown area response.
Herewith I attached Shimadzu GC- TCD analysis of CO2, N2, O2, and CH4 calibration for your reference.
Kindly check on this paper
https://www.mdpi.com/2673-8783/2/1/2/pdf
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