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Arsenic and metal mobility from Au mine tailings in Rodalquilar (Almaría, SE Spain)
Navarro Flores, Andrés Francisco; Domènech Rubio, Luis Miguel
Universitat Politècnica de Catalunya. Departament de Mecànica de Fluids
In the old mining area of Rodalquilar, minewastes, soil and sediments were characterized and the results revealed high concentration of Au, Ag, As, Bi,Cu, Fe, Mn, Pb, Se, Sb and Zn in tailings and sediments.The contaminant of greatest environmental concern is As. The mean concentration in the tailings was 679.9, and 345 mg/kg in the sediments of Playazo creek. The groundwater samples from the alluvial aquifer showedhigh concentration of Al, As, Cd, Fe, Hg, Mn, Ni, Pb, Se, Sb and Zn and very high concentration of chloride and sulfate, which were above the concentration definedin the European standards for drinking water. The presence of As in groundwater may be caused by the oxidation of arsenian pyrite, the possible As desorption from goethite and ferrihydrite and the jarosite dissolution.Groundwater concentrations of Cd, Fe, Mn, andpossibly Cu, were associated with low values of Eh, indicating the possible dissolution of oxy-hydroxides of Fe and Mn. The mobility of metals in the column experiments show the release of Al, Fe, Mn, Cr, Cu, Ni, V and Zn in significant concentrations but below thedetected values in groundwater. However, As, Cd, Sb, Se Pb and Au, are generally mobilized in concentrations above the detected values in groundwater. The possiblemass transfer processes that could explain the presence of the contaminants in the aquifer and the leachates was simulated with the PHREEQC numerical code and revealed the possible dissolution of the following mineralphases: jarosite, natrojarosite, arsenian pyrite, alunite, chlorite, kaolinite and calcite.
2012-05-10
Àrees temàtiques de la UPC::Enginyeria civil::Geologia::Hidrologia subterrània
Àrees temàtiques de la UPC::Enginyeria civil::Enginyeria de mines
Groundwater
Arsenic
Mineral industries--Environmental aspects
Metals
Aigües subterrànies -- Contaminació
Arsènic -- Toxicologia
Metalls -- Aspectes ambientals
Indústria minera -- Deixalles -- Eliminació
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