Publication Date:
2017-04-04
Description:
We present a new device for continuous monitoring of the concentration of CO2 dissolved
in water. The device consists of a tube made of a polymeric semi-permeable membrane
connected to an infrared gas analyser (IRGA) and a pump. Several laboratory experiments
were performed to set the best operating condition and test the accuracy of measurements.
We used the device for performing 20 months of continuous monitoring of dissolved CO2
concentration (DCC) in groundwater within a drainage gallery at Mt. Etna. The monitored
groundwater intercepts the Pernicana Fault, along which degassing is observed related to
volcano-tectonic activity. The acquired data were compared with continuous and discrete
data obtained using existing methods. The measurements of DCC resulted in some period
of the year well correlated with air temperature. We also found that long-term trends, as
well as short-term variations, are probably linked to the dynamics of volcanic activity
and/or perturbations in the local or regional stress fields.
Description:
Published
Description:
3005-3011
Description:
1.2. TTC - Sorveglianza geochimica delle aree vulcaniche attive
Description:
JCR Journal
Description:
restricted
Keywords:
Dissolved CO2
;
Groundwater monitoring
;
Gasewater exchange
;
03. Hydrosphere::03.02. Hydrology::03.02.03. Groundwater processes
;
03. Hydrosphere::03.02. Hydrology::03.02.04. Measurements and monitoring
;
03. Hydrosphere::03.02. Hydrology::03.02.06. Water resources
;
03. Hydrosphere::03.02. Hydrology::03.02.07. Instruments and techniques
Repository Name:
Istituto Nazionale di Geofisica e Vulcanologia (INGV)
Type:
article
