Heavy metals biogeochemistry in abandoned mining areas
1 Department of Geology, University of Trás-os-Montes e Alto Douro, Vila Real, PORTUGAL
2 Department of Earth Sciences, University of Coimbra, Coimbra, PORTUGAL
3 IMAR-CMA Marine and Environmental Research Centre, University of Coimbra, Coimbra, PORTUGAL
Plants growing on the abandoned Portuguese mines, highly contaminated with W, Sn, As, Cd, Cu, Zn and Pb, have been studied for their biogeochemical indication/prospecting and mine restoration potential. The results of analysis show that the species best suited for biogeochemical indicating are: aerial tissues of Halimium umbellatum (L.) Spach, for As and W; leaves of Erica arborea L. for Bi, Sn, W and mostly Pb; stems of Erica arborea L. for Pb; needles of Pinus pinaster Aiton and aerial tissues of Pteridium aquilinum (L.) Kuhn for W; and leaves of Quercus faginea Lam. for Sn. The aquatic plant studied (Ranunculus peltatus Schrank) can be used to decrease the heavy metals, and arsenic amounts into the aquatic environment affected by acid mine drainages.
Key words: Acid mine drainage / bioaccumulation / bioindicating / mine restoration / native plants / soils
© Owned by the authors, published by EDP Sciences, 2013
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