Articles scientifiques
Z. Idardare, A. Moukrim, J. F Chiffoleau, and A. A Alla (2011)
Trace metals in the clam Donax trunculus L. from the Bouadisse sandy beach, discharge zone of a plant sewage outfall in Agadir Bay (Morocco)
In: Proceedings of the Fifth International Symposium on Sandy Beaches, vol. Travaux de l'Institut Scientifique, Rabat, pp. 61–58, Rabat, Morocco.
Donax trunculus were sampled seasonally during 2004-2005, from six stations along the coastline of the Bouadisse sandy beach. This site is located at 10 km south of Agadir (Morocco) and subjected to the pollution generated by a wastewater treatment plant outfall. The concentrations of heavy metals accumulated in the clams’ soft tissues were measured. The concentrations of Cd, Ag, Pb, Cu, Zn and Ni were determined by ICP-MS methods, whilst Cr was quantified by AAS. The results show that D. Trunculus appear to accumulate more Pb, Cr, Zn and Ni along the north-south sites especially in the stations closest and situated in the south of the sewage outfall indicating an influence of the sewage outfall toward the South. This gradient suggests that the distribution of these heavy metals is probably affected by a coastal current flowing in this area from the North to the South. However, the concentrations of Cd and Ag were lower in the same sites. It can be related to high salinity in wastewater discharged on the beach.
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