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Role of unsaturated soil above a heavily contaminated aquifer in the natural attenuation of arsenic

dc.contributor.authorMartínez Villegas, Nadia Valentina
dc.contributor.authorGómez Hernández, Andrea del Pilar
dc.contributor.authorZamora Morales, Armando
dc.contributor.authorHernández Martínez, Jejanny Lucero
dc.contributor.authorMeza Figueroa, Diana María
dc.contributor.authorSenGupta, Bhaskar
dc.date.accessioned2020-03-25T01:26:37Z
dc.date.available2020-03-25T01:26:37Z
dc.date.issued2019
dc.identifier.citationRole of unsaturated soil above a heavily contaminated aquifer in the natural attenuation of arsenic Martínez Villegas, Nadia Valentina
dc.identifier.citationGómez Hernández, Andrea del Pilar
dc.identifier.citationZamora Morales, Armando
dc.identifier.citationHernández Martínez, Jejanny Lucero
dc.identifier.citationMeza Figueroa, Diana
dc.identifier.citationSenGupta, Bhaskar. E3S Web Conf., 98 (2019) 09017 DOI: https://doi.org/10.1051/e3sconf/20199809017
dc.identifier.urihttp://hdl.handle.net/11627/5330
dc.description.abstract"Large attenuation of arsenic is observed in a shallow aquifer in central Mexico, where the concentration decreases from 91.5 to 11.3 mg/L, over 1.3 km horizontal distance. To investigate possible mechanisms of attenuation of this pollutant, we dug a pit between the surface and the saturated zone. We then described the soil profile and determined arsenic and iron concentrations in soil samples as a function of depth. Next, we determined particle size distribution, bulk density, particle density, soil moisture and porosity of the soil material. We also analyzed arsenic concentration in the groundwater. The 2.2 m deep profile intersected 4 soil horizons (A, AB, B1 and B2). We found arsenic accumulation in the B2 horizon, directly overlying the saturated zone. These accumulations coincide with the thickness of the capillary fringe, revealing that arsenic is drawn up in the soil profile by capillary rise of arsenic-contaminated groundwater. Furthermore, arsenic accumulation showed a direct relationship with iron, likely due to arsenic adsorption on iron oxides. Results from this study contribute to understanding a capillary-driven natural attenuation mechanism that removes contaminants from groundwater by sinking them in the capillary fringe."
dc.publisherEDP Sciences
dc.rightsAttribution-NonCommercial-NoDerivatives 4.0 Internacional
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/4.0/
dc.subject.classificationGEOQUÍMICA
dc.titleRole of unsaturated soil above a heavily contaminated aquifer in the natural attenuation of arsenic
dc.typearticle
dc.identifier.doihttps://doi.org/10.1051/e3sconf/20199809017
dc.rights.accessAcceso Abierto


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Attribution-NonCommercial-NoDerivatives 4.0 Internacional
Except where otherwise noted, this item's license is described as Attribution-NonCommercial-NoDerivatives 4.0 Internacional