detection of CO2 with a cheap method

[montavala]

Hello. I have a problem of detection of CO2 with a cheap method. I read something about detection over the KOH solution measuring the conductivity (or the pH value). Does somebody knows more about it? The exhausted gas from my furnace contains actualy both CO and CO2, but I would like to convert it completely (some tips how to manage it would also be desirable) to CO2, and afterwards to detect it. This CO2 would be in small quantity (50-100 mg) mixed with sufficient oxygen, and is supposed to be exhausted in 50-100 h of process.
I believe there must be some efficient method to detect correct enough (10-20%) the CO2 overall quantity.

Thanks in advance.
Bojan

 

[jmj5152]

I have converted CO in a reformate gas by bubbling through Na2Cr2O7. You will get tri chrome, which can be reoxidized at an anode. TOC detection methods will get you the CO2 levels. However, your levels are not clear from your note.

 

[0809]

montavala,
use Infrared gate as a detector. It will help to detect CO2 in gases.
best regards