If we are working in packed reactor and we have to measure dissolved CO2 concentration alternately of liquid media then what should be the accurate method or equipment?
Dear Harshita,
I don't know what kind of liquids you are working with, but if it is aqueous solutions you could measure CO2 in the water with an instrument like this:
https://www.km.kongsberg.com/ks/web/nokbg0240.nsf/AllWeb/537648638D3F59AAC1257EDC0040495F?OpenDocument
However, the value you get is not the CO2 concentration (DIC), but the partial pressure of CO2 (pCO2). Depending on the composition of the water sample, a conversion of pCO2 into DIC might be possible.
Hope this is helpful!
Jens
CO2 has a good FTIR absorbency.
If you set your background/baseline spectra to be your liquid media before any dissolved CO2 is present, then you should be able to get quantitative data via IR (this could be useful if you were wanting something to scale up/use a measurement on a continuous process?)
I like Fiona's approach. You could acidify to release convert HCO3 to CO2 and aspirate the CO2 through the IR.
If the matrix is constant you might develop a model based on pH.
It might also be possible to acidify and have an electrode with a gas permeable membrane with a conductivity cell -- this might even be commercially available
D. Atamanchuk (2014) was working on Aanderaa Oxygen optodes building a pCO2 optode from that, by changing the diode frequency. These optodes work on flourescent quenching. I am working with these optodes now myself.
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