The use of radon (Rn-222) and volatile organic compounds in monitoring soil gas to localize NAPL contamination at a gas station in Rio Claro,São Paulo State,Brazil |
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Institution: | 1. Department of Geosciences, Georgia State University, 38 Peachtree Center Avenue, Atlanta, GA 30303, United States of America;3. School of Public Health, Georgia State University, 140 Decatur Street, Atlanta, GA 30303, United States of America;4. Division of Environmental Health Science and Practice, National Center for Environmental Health, Centers for Disease Control and Prevention, Atlanta, GA, 30341, United States of America |
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Abstract: | This study focuses on the presence of radon (222Rn) and volatile organic compounds (VOCs) in soil gases at a gas station located in the city of Rio Claro, São Paulo, Brazil, where a fossil fuel leak occurred. The spatial distribution results show a correlation between 222Rn and VOCs, consistent with the fact that radon gas has a greater chemical affinity with organic phases than with water. This finding demonstrates that the presence of a residual hydrocarbon phase in an aquifer can retain radon, leading to a reduced radon content in the soil gas. The data in this study confirm the results of previous investigations, in which the method used in this study provided a preliminary fingerprint of a contaminated area. Furthermore, the data analysis time is brief, and only simple equipment is required. |
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Keywords: | Radon Volatile organic compounds Subsurface contamination NAPL |
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