I want to know if it is possible to measure biogas using GC-MS instead of GC and what is the procedure for that?
GC MS is used to identify the chemical species present in a given sample. Quantification of the species requires PID or FID detector. Refer following link
https://archive.epa.gov/epawaste/hazard/testmethods/web/html/8_series.html
Dear Dr Pourrostami, MS is a universal and high sensitive detector, so yes of course you can use GCMS for quantification of biogas components. The point is that, depending on which component you are interested in, MS is generally not the best technique. I will give you some specific examples. For CO2, CH4, CO, N2 and O2, a microGC with a TCD detector is the best instrument: GCMS is more expensive and furthermore you will struggle to find a suitable capillary column. For H2, you cannot use the vast majority of commercial GCMS because their lower limit of m/z ratio is 10 (while H2 m/z=2 of course). On the other hand, you might use GCMS for the analysis of H2S, mercaptans and amines, despite there are other more suitable techniques. And finally, GCMS is the optimal technique for the analysis of siloxanes, terpenes and halogenated volatile organic compounds in biogas. I hope these indications will be useful. You might also refer to Article Characterisation and cleaning of biogas from sewage sludge f...
Yes, I think so. The GC will firstly separate your compounds (methane, CO2, etc) and then the MS will reliable identify them. You can quantify the compounds either in TIC or SIM mode.
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