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You are here: Home » Past Issues » Volume 8, 2013 - Number 3 » FLUX MEASUREMENTS OF 222Rn, CH4 AND CO2 ALONG WITH SOIL GAS CONCENTRATIONS (222Rn, CO, NO2 AND SO2) OVER A METHANE RESERVOIR IN TRANSYLVANIA (ROMANIA)


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Nicolae FRUNZETI1, Mircea MOLDOVAN1*, Bety-Denissa BURGHELE1, Constantin COSMA1, Calin BACIU1, Botond PAPP1, Gabriela Emilia POPITA1 & Laurentiu Cristian STOIAN2
1Babeş-Bolyai University, Faculty of Environmental Science and Engineering, Fantanele street, 30, 400294, Cluj-
Napoca, Romania. *E-mail: mircea.moldovan@ubbcluj.com
2Babeş-Bolyai University, Faculty of Geography, Clinicilor Street, 5-7, 400006, Cluj-Napoca, Romania

FLUX MEASUREMENTS OF 222Rn, CH4 AND CO2 ALONG WITH SOIL GAS CONCENTRATIONS (222Rn, CO, NO2 AND SO2) OVER A METHANE RESERVOIR IN TRANSYLVANIA (ROMANIA)

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Abstract:

The Transylvanian Basin is well known for its large and good quality methane accumulations. In many sites these accumulations are not completely sealed, and methane leaks into the atmosphere through faults or fractures. A soil gas survey was carried out after a rainy season at Sărmăşel, the largest methane seep in Transylvania. This study presents the first results of soil 222Rn concentration measurements in relation with CH4 flux, in an attempt to better understand the spatial distribution of soil gas concentrations and migration toward the surface in this area. Taking into account the particular situation in the field, the study area was divided in two sub-areas corresponding to the two main seeps with high methane emissions and everlasting fires. Accordingly, two sets of measurements were performed. The first set was distributed on a 36 meters transect with respect to seep 1. The soil gases concentrations (222Rn, CO, NO2 and SO2) were measured at 80 cm depth along with CH4 and CO2 fluxes. The maximum values of 222Rn concentration from soil was found at 17.5 kBqm-3 and quite high concentrations of other gases, such as 19 ppm of CO, 1 ppm of SO2 and 0.7 ppm of NO2. The results suggest that concentrations of CO, NO2 and SO2 correlate with CH4 and CO2 fluxes. Radon concentration in soil seems to be more dependent on soil permeability than on the CH4 flux. For the second set of measurements, the CH4 and 222Rn fluxes were randomly distributed around the main vents. It was observed a relatively high 222Rn flux with a maximum value of 119.3 mBqm-2s-1 and an average of 58.4 mBqm-2s-1, over an area with high CH4 emission.


Keyword: gas geochemistry, methane, radon, soil permeability


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