ANALYSE ET SPECIATION DES METAUX DANS LES SEDIMENTS D'UNE RETENUE ARTIFICIELLE EN ZONE MINIERE CAS DU BARRAGE DE GUENITRA, ALGERIE

摘要

The distribution of Cd, Pb, Zn, Mn and Fe was studied in the sediments of Guenitra reservoir located in a mining zone in the northeast of Algeria. An analytical procedure involving sequential chemical extractions was used for the partitioning of metals in the fractions: exchangeable, bound to carbonates, bound to iron and manganese hydroxides, bound to organic matter and bound to mineral structures. Experimental results obtained, show that the metals investigated are distributed in all the compartments of the sediments. Except for iron, the quantity of each metal associated with the available fractions exceeded 70% of the total quantity. Cd and Zn mostly occurred in the oxidisable fraction and the hydroxide bound fraction dominated in the case of Pb.