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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
Title of journal: Geochemistry, Geophysics, Geosystems
Series/Report no.: 9/6(2005)
Publisher: American Geophysical Union
Issue Date: 7-Sep-2005
DOI: 10.1029/2005GC000947
Keywords: dissolved gases
helium isotope
PTFE membrane
Vulcano Island
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.
Appears in Collections:04.04.11. Instruments and techniques
03.02.07. Instruments and techniques
04.08.07. Instruments and techniques
03.02.04. Measurements and monitoring
04.06.08. Volcano seismology
04.08.06. Volcano monitoring
04.04.12. Fluid Geochemistry
Papers Published / Papers in press

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