Hydrochemistry of superficial waters in the Adoria mine area (Northern Portugal): environmental implications |
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Authors: | Paulo J C Favas Jo?o Pratas and M Elisa P Gomes |
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Institution: | (1) Department of Geology, School of Life Sciences and the Environment, University of Tr?s-os-Montes e Alto Douro, Apartado 1013, 5001-801 Vila Real, Portugal;(2) Department of Earth Sciences, Faculty of Sciences and Technology, University of Coimbra, Coimbra, Portugal;(3) Geosciences Center, Faculty of Sciences and Technology, University of Coimbra, Coimbra, Portugal |
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Abstract: | The purpose of this work is to characterize the hydrochemical behavior of acid mine drainages (AMD) and superficial waters
from the Adoria mine area (Northern Portugal). Samples of superficial and mine drainage water were collected for one year,
bi-monthly, with pH, temperature, Eh, conductivity and HCO3 determined in situ with chemical analyses of SO4, Ca, K, Mg, Na, Cl, Ag, As, Bi, Co, Cu, Fe, Mn, Ni, Pb, Zn and Cd. In the mine, there are acidic waters, with low pH and
significant concentrations of SO4, and metals (Fe, Mn, Zn, Cu, Pb, Cd and Ni), while in the superficial natural stream waters outside the mine, the pH is close
to neutral, with low conductivity and lower metal concentrations. The stream waters inside the mine influence are intermediate
in composition between AMD and natural stream waters outside the mine influence. Principal Component Analysis (PCA) shows
a clear separation between AMD galleries and AMD tailings, with tailings having a greater level of contamination. |
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