| Numéro |
J. Phys. IV France
Volume 107, May 2003
|
|
|---|---|---|
| Page(s) | 139 - 142 | |
| DOI | https://doi.org/10.1051/jp4:20030262 | |
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. Albertazzi11 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
Abstract
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