Apparatus and method for identifying a co2 content of a fluid

An apparatus for identifying a CO2 content of a fluid, comprising:

• an absorber device having a porous material, the absorber device being contactable with the fluid;
• pores of the porous material having at least one hydrophilic first chemically functional group, the first chemically functional group being joined to the porous material, and the first chemically functional group having the property of reacting in alkaline fashion with water, a surface of the absorber device having at least one further chemically functional group, and the at least one further chemically functional group being embodied to improve an ability of the absorber device to attach to metals;
• an electrode device disposed on the absorber device for electrical contacting of the absorber device;
• and
• an evaluation device electrically connected to the electrode device, by which an electrical property of the absorber device is measurable to identify the CO2 content of the fluid.