Abstract
An automatic system for the continuous monitoring of CO2, H2S, SO2 and meteorological parameters in atmosphere has been developed. The system has been tested in the laboratory in order to verify the stability and reliability of each sensor and of the whole system. A field test for a period of one month, at the Solfatara of Pozzuoli has also been carried out. The acquired data during the field test reveal a correlation between the wind speed and the concentrations of CO2, H2S, and SO2 in the atmosphere. With a wind speed of over 4 ms-1 the concentration of the three gases reached constant background values of 600 ppm for CO2 and about 2 ppm vol. for H2S and SO2. The different ratios of H2S/SO2 measured in the fumaroles (~100) and in the atmosphere (1–0.1) clearly indicate that H2S is oxidized to SO2 during the transport.
Highlights
Active volcanic areas are generally indicated by different kinds of degassing, such as fumaroles, mofettes and diffuse soil degassing
Several studies carried out in different volcanic areas clearly indicate that the presence of gas hazard is quite recurrent and that it is essentially controlled by the strength of the source, the morphology of the area, and meteorological parameters.[1,2,3,4,5]
The automatic apparatus developed in this study after the laboratory tests was successfully tested inside the Solfatara of Pozzuoli
Summary
Active volcanic areas are generally indicated by different kinds of degassing, such as fumaroles, mofettes and diffuse soil degassing. According to the composition of volcanic gases, the main gaseous constituents that could be responsible for the existence of gas hazard are essentially CO2, H2S, and SO2. The last two gases are normally present in areas close to fumaroles and the ratio H2S/SO2 in fumarolic gases can change in a wide range, being essentially controlled by the temperature and oxygen fugacity values of fumaroles (at higher temperature and fO2, SO2 is species at lower more abundant while H2S is the temperatures and fO2).[6] The CO2 dominant is always present in all gaseous manifestations such as fumaroles, mofettes, diffuse soil degassing and it is the most abundant species of the incondensable gases. Automatic station for continuous monitoring of CO2, SO2, H2S and meteorological parameters
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
