Aplicación de un sistema electro-magnético en dominio de frecuencias (FDEM) para la caracterización de suelos contaminados por arsénico
- A. Muñoz-Martín 1
- M.L. García Lorenzo 1
- E. Crespo 1
- J.M. Ruiz-Roso 2
- J.L. Granja 1
- P. Castiñeiras 1
-
1
Universidad Complutense de Madrid
info
- 2 Instituto de Geociencias (UCM, CSIC)
ISSN: 1576-5172
Any de publicació: 2021
Títol de l'exemplar: X Congreso Geológico de España
Número: 18
Pàgines: 489
Tipus: Article
Altres publicacions en: Geotemas (Madrid)
Resum
Geophysical techniques are increasingly used for determining the pollution of soils in environmental studies, since they are non-invasive techniques, and let to obtain a high amount of information at a low cost. The potential of an EM system in frequency domain (FDEM) has been used to characterize the subsoil of an ancient mining area in Guadalix de la Sie- rra (Madrid) with presence of arsenic. A field campaign was carried out, allowing to obtain the apparent resistivities and in-phase component in the soils up to 3.3. m deep. Acquired data have been represented, and maps of these variables at three different depths have been created, as well as 2D tomographic resistivity sections across the main anomalous areas. The results have been compared with previous geochemical data (Ruiz-Roso, 2018), and the viability of the FDEM technique has been analyzed in order to determine areas with high potential of arsenic contamination. Geophysical results allow to discri- minate four types of materials: a) passive mining infillings, b) fresh rock (gneises), c) soils and d) fractured zones in the base- ment. Geochemical results suggested that the highest arsenic contents are coincident with areas of passive mining infillings and /or soils. Geophysical and geochemical results support the use of this FDEM geophysical technique in the screening of areas with potential heavy metal contamination.