The study of geochemical parameters applied to natural systems has
provided improved knowledge of geochemical mechanisms of gas/rock
dissolution in natural waters that are linked to gas–water and/or water–
rock interaction processes. Here we present the results of our studies focused
on the development of an automated monitoring system for measuring
the amount of dissolved CO2 in natural waters. The system is based on the
principle of a dynamic equilibrium between water and the air as the host
gas. The PCO2 measurements were carried out every four hours, and the
equilibration time was around 20 minutes. Moreover, application to the
thermal aquifer of Stromboli volcano during the 2009-2010 period is shown
and analyzed. The data highlight a clear correlation between the changes
in the PCO2 in the thermal aquifer and the changes in volcanic activity