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Authors: De Gregorio, S.* 
Gurrieri, S.* 
Valenza, M.* 
Title: A PTFE membrane for the in situ extraction of dissolved gases in natural waters: Theory and applications
Issue Date: 7-Sep-2005
Series/Report no.: 9/6(2005)
DOI: 10.1029/2005GC000947
Keywords: dissolved gases
helium isotope
PTFE membrane
Vulcano Island
Subject Classification03. Hydrosphere::03.02. Hydrology::03.02.04. Measurements and monitoring 
03. Hydrosphere::03.02. Hydrology::03.02.07. Instruments and techniques 
04. Solid Earth::04.04. Geology::04.04.11. Instruments and techniques 
04. Solid Earth::04.04. Geology::04.04.12. Fluid Geochemistry 
04. Solid Earth::04.06. Seismology::04.06.08. Volcano seismology 
04. Solid Earth::04.08. Volcanology::04.08.06. Volcano monitoring 
04. Solid Earth::04.08. Volcanology::04.08.07. Instruments and techniques 
Abstract: A new method for extracting dissolved gases in natural waters has been developed and tested, both in the laboratory and in the field. The sampling device consists of a polytetrafluroethylene (PTFE) tube (waterproof and gas permeable) sealed at one end and connected to a glass sample holder at the other end. The device is pre-evacuated and subsequently dipped in water, where the dissolved gases permeate through the PTFE tube until the pressure inside the system reaches equilibrium. A theoretical model describing the time variation in partial gas pressure inside a sampling device has been elaborated, combining the mass balance and ‘‘Solution-Diffusion Model’’ which describes the gas permeation process through a PTFE membrane). This theoretical model was used to predict the temporal evolution of the partial pressure of each gas species in the sampling device. The model was validated by numerous laboratory tests. The method was applied to the groundwater of Vulcano Island (southern Italy). The results suggest that the new sampling device could easily extract the dissolved gases from water in order to determine their chemical and isotopic composition.
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