Distribution of metallic trace elements (ETM) in surface soils around the Mediouna discharge (southern of Casablanca)

S. Fait, S. Fakhi, M. El Mzibri, Z. Faiz, H. Fougrach, W. Badri, A. Smouni, M. Fahr

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The objective of present research was to characterize the surface soils located at 300, 600 and 1000 m of an uncontrolled landfill. The work also aims to evaluate the levels and spatial distribution of metallic trace elements (Cd, Pb, Cu, Ni, Zn, Cr,
Co and As) in these soils. Soil samples were collected in 36 points around the landfill. Results showed that Cd, Pb, Zn are concentrated in the soils rich in clay and carbonates, and in organic matter, located at 300 m from the landfill. The
basic pH of all soils enhances the retention of these metals. On the other hand, As present in soils at 300, 600 and 1000 m at concentrations slightly higher than those of referenced soils were apparently mobilized by water from the
solid/water interfaces. The other metals Cu, Ni, Co, Cr are present at very low concentrations.