J. Phys. IV France
Volume 107, May 2003
Page(s) 139 - 142

J. Phys. IV France
107 (2003) 139
DOI: 10.1051/jp4:20030262

Heavy metals in Morocco Lagoon and river sediments

L.G. Bellucci1, B. El Moumni2, F. Collavini3, M. Frignani1 and S. Albertazzi1

1  Instituto di Geologia Marina, CNR, via Gobetti 101, 40129 Bologna, Italy
2  Université Abdelmaleck Essaadi, Department of Earth Sciences and Oceanology, Tangier, Morocco
3  Instituto per lo Studio della Dinamica delle Grandi Masse, CNR, 30122 Venice, Italy

Analyses of Mn, Cd, Cr, Cu, Pb, and Zn were carried out in a short core from a salt marsh of the Nador Lagoon (north-eastem Morocco) and in surficial sediment samples collected in the Martil river, which borders the industrial town of Tétouan. Three soit samples and a reservoir sediment were also collected around the town to check the effects of atmospheric delivery of contaminants. 137Cs and 210Pb activity-depth profiles were used to establish a chronology for the core, obtaining an apparent accumulation rate of 0.41 cm y -1. The concentrations of anthropogenic metals in this marsh sediment are low and probably represent natural backgrounds. A recent decrease can be an effect of changing grain size. The Martil River sediments are slightly contaminated by Cu and Pb, whereas the soil samples present anomalous values of Cd and Zn.

© EDP Sciences 2003