The system is based on the principle of a dynamic equilibrium between water and the air as the host gas.
The amount of CO2 in the circulating gas phase is measured by the IR spectrometer, and it increases with time until it reaches the value corresponding to that at complete equilibrium with CO2 in water: PCO2(gas) PCO2(water).
The concentration of CO2 is automatically measured in the air inside the chamber both before and after each re-equilibration cycle. The values of CO2 reached at the end of the equilibration time (about 20 min) represent the partial pressures of the CO2 in the natural system being studied at the measured water temperature
The soil flux station is able to measure:
- Dissolved carbon dioxide concetration by DRAGER IRCO2 detector.
- Water pH
- Water conductivity
Other parameters are available upon request.