Using a multi-method approach based on soil radon deficit, resistivity, and induced polarization measurements to monitor non-aqueous phase liquid contamination in two study areas in Italy and India
| Autor: | Sudha Agrahari, Francesca Pompilj, Pierpaolo Curatolo, Riccardo Giorgi, Gabriele De Simone, Paola Tuccimei, Pierluigi Friello, Debashish Sengupta, Carlo Lucchetti, M Castelluccio, Gianfranco Galli |
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| Přispěvatelé: | Castelluccio, Mauro, Agrahari, Sudha, De Simone, Gabriele, Pompilj, Francesca, Lucchetti, Carlo, Sengupta, Debashish, Galli, Gianfranco, Friello, Pierluigi, Curatolo, Pierpaolo, Giorgi, Riccardo, Tuccimei, Paola |
| Rok vydání: | 2017 |
| Předmět: |
Pollution
Health Toxicology and Mutagenesis media_common.quotation_subject Soil electrical resistivity chemistry.chemical_element India Aquifer Radon Soil science 010501 environmental sciences 010502 geochemistry & geophysics 01 natural sciences Induced polarization NAPL contamination Radiation Monitoring Environmental Chemistry Soil Pollutants Soil Pollutants Radioactive Soil induced polarization 0105 earth and related environmental sciences media_common geography geography.geographical_feature_category Non-aqueous phase liquid Environmental monitoring Soil classification General Medicine Soil contamination chemistry Italy Soil water Environmental science Soil radon Gasoline |
| Zdroj: | Environmental science and pollution research international. 25(13) |
| ISSN: | 1614-7499 |
| Popis: | Geochemical and geophysical surveys employing radon deficit, resistivity, and induced polarization (IP) measurements were undertaken on soil contaminated with non-aqueous phase liquids (NAPLs) in two different sites in India and in Italy. Radon deficit, validated through the comparison with average soil radon in reference unpolluted areas, shows the extension of contamination in the upper part of the unsaturated aquifers. In site 1 (Italy), the spill is not recent. A residual film of kerosene covers soil grains, inhibiting their chargeability and reducing electrical resistivity difference with background unpolluted areas. No correlation between the two parameters is observed. Soil volatile organic compounds (VOCs) concentration is not linked with radon deficit, supporting the old age of the spillage. NAPL pollution in sites 2a and 2b (India) is more recent and probably still active, as demonstrated by higher values of electrical resistivity. A good correlation with IP values suggests that NAPL is still distributed as droplets or as a continuous phase in the pores, strengthening the scenario of a fresh spill or leakage. Residual fraction of gasoline in the pore space of sites 2a and 2b is respectively 1.5 and 11.8 kg per cubic meter of terrain. This estimation is referred to the shallower portion of the unsaturated aquifer. Electrical resistivity is still very high indicating that the gasoline has not been strongly degraded yet. Temperature and soil water content influence differently radon deficit in the three areas, reducing soil radon concentration and partly masking the deficit in sites 2a and 2b. |
| Databáze: | OpenAIRE |
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