Water displacement and other methods, but they speak of volume of biogas. I am interested in percentage of methane in biogas
There exist another possibility, how to measure methane production without GC.
This is absorption method when CO2 is absorbed in acidic solution and you can measure the volume of methane produced. Please see detailed description of the adsorption metod:
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4093249/pdf/ajas-26-6-864-15.pdf
est regards
Vit
You can remove CO2 with CaOH solution and determine the CO2 concentration.
It should be possible to catalytically burn CH4 with O2 on a Pt@C catalyst or in a fuel cell. Then measure the CO2 amount of again.
Of course, such methods are outdated and will only give you qualitative results. I'd be surprised if you could get something like that published. For research and quantitative results, GC will probably be required.
Absorption method works. You may use any of the alkaline solutions such as NaOH, KOH or Ca (OH)2. 1M, 2 or 3M concentration should be ok. The method is based on the assumption that biogas consists mainly if methane and CO2. Cheers
I am working succesfully with Drager X-am 7000 (Gremany) device for measurement of the content of CH4, CO2, H2S and O2 in the biogas (0-100 vol %).
We are using a system with infrared and electrochemical sensors in our lab from the company awite (http://www.awite.com/products/gas-analysis/principle-of-measurement.html). But there are many other companies out there, e.g. http://www.bluesens.com/english/products/biogasanalysis/laboratoryscale.html
Also, always remember to note down the temperature and pressure in your lab to be able to normalize the gas amounts.
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