Spatial variability of soils and stream sediments and the remediation effects in a Portuguese uranium mine area

摘要: Abstract The old Senhora das Fontes uranium mine, located in central Portugal, was closed down 1971. treatment of ores from this mine and other mines by heap-leach ended 1982. Seven dumps partially covered vegetation were left the area. Soil stream sediment samples collected December 2009. remediation carried out May 2010 to January 2011. Stream again October 2013. Before remediation, soils inside influence area have higher Al, As, Co, Cr, Cu, Fe, Ni, Sr, Th, U Zn concentrations than outside area, due radionuclides, metals metalloid released dumps. principal component analysis (PCA) shows a distinction between U(VI), As(V) can be adsorbed Fe-oxyhydroxides humic acid increase uptake. Soils must not used for public or private green residential areas, because they are contaminated U, Cd Ni. downstream sediments Mn, Pb, upstream sediments, erosion percolation water through PCA sediments. Th Fe-oxyhydroxides. U. Downstream most As. After generally before attributed relocation Radionuclides, metalloids transported surface water. Consequently became more As but intensively downstream.