SPECIATION OF HEAVY METALS IN SEDIMENTS OF SEBOU RIVER (MOROCCO) BY INDUCTIVELY COUPLED PLASMA ATOMIC EMISSION SPECTROSCOPY

B. El Kihel1*, M. Halim2*, E.B. Jaaidi1, M. Ahmamou1, R. Zougary1

1 Department of Earth Sciences, University Mohamed V- Agdal- Faculty of Sciences, Agdal- Rabat, Morocco.

2 Department of Chemistry, University Mohamed V-Agdal-, B.P. 1014, Faculty of Sciences, Agdal- Rabat, Morocco.

* Corresponding author. E-mail: halim@fsr.ac.ma

Received: 11 May 2005; revised version accepted: 03 January 2006

Abstract

Different heavy metals (Cd, Cr, Cu, Fe, Pb, Zn, Ni and Mn) have been determined in the Sebou River bed sediments (located in central of Morocco) to establish the extent to wich there sediments are polluted and their capacity of remobilisation.

The samples analysed were taken from superficial sediments and the results showed a great extent of contamination by Cr, Cu, Zn and Pb. The results revealed also above normal concentrations in Mn with no anthropogenic sources. For mineral speciation a contamination of two sequential schemes were used. The concentration of Cd, Zn, Ni and Pb metals were associated with the fractions of Fe-Mn hydroxides followed by silicates , with minor percentage in the organic fraction. The Cr, Fe and Cu were specially bounded to Fe-Mn oxides and silicates.

Keywords : Sediment; Heavy metals; Contamination; Speciation; Sebou River; Morocco; Geochemistry.

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