Hi dears
Although the GC analysis is the best way for CO2 measurement I need a simple chemical approach for measuring CO2 concentration in the air. Please guide me.
- The simple method is to use infrared absorbance, but that is not a chemical method.
- If you have a very accurate pH-meter you could measure the pH in pure water in equilibrium with the gas.
- Very complicated physical-chemical method is the way Keeling did it. See the box here:
Article Charles David Keeling and the Story of Atmospheric CO2 Measurements
There are several simple chemical approaches for measuring CO2 concentration in the air, including the use of limewater, IR gas analyzers, and NDIR sensors. Each method has its own advantages and disadvantages, and the choice of method depends on the specific requirements of the application, including the desired level of accuracy, the cost of the equipment, and the availability of resources.
The CO2 can be sorbed by XS base such as Ba(OH)2 and the carbonate measured. I recall seeing this in old literature but please don't ask me to find the source.
The simplest way came to my mind would be through a water trap and measuing it as the water alkalinty. But I don't know if it is feasible/sensetive enough at your interested concentration, temperature, etc.