title: Assessment of contamination, distribution and chemical speciation of trace metals in water column in the Dakar coast and the Saint Louis estuary from Senegal, West Africa.
abstract: The water column from Dakar coast and Saint Louis estuary in Senegal, West Africa, was sampled in order to measure the contamination level by trace metals. The speciation of metals in water allowed performing a distribution between dissolved and particulate trace metals. For the dissolved metals, the metallic concentration and repartition between the organic fraction and the inorganic fraction were performed. The results show that the pollution of the estuary was more serious than in Dakar coast for Co, Cr, Ni, Pb and Zn; while, Cd and Cu were higher in Dakar coast. A strong affinity between metals and suspended particles has been revealed. Dissolved metals that have a tendency to form organic metal complexes are in decreasing order: Cd, Zn, Pb, Co=Cr=Mn, Cu and Ni. The results showed that the mobility of trace metals in estuary is controlled by dissolved organic carbon, while in coast it depends on chlorides.
authors.affiliation: Université Lille 1, Equipe Chimie Marine Bâtiment C8, Laboratoire Géosystèmes, UMR-CNRS 8217, 59655 Villeneuve d'Ascq Cedex, France; Université du Littoral Côte d'Opale, Centre Commun de Mesures, 145 Avenue Maurice Schuman, 59140 Dunkerque, France; Université Cheikh Anta DIOP de Dakar, Laboratoire de Toxicologie et Hydrologie, BP 5005, Dakar Fann, Senegal.
authors.forename: Cheikh
authors.initials: C
authors.lastname: Diop
authors.affiliation: Université du Littoral Côte d'Opale, Centre Commun de Mesures, 145 Avenue Maurice Schuman, 59140 Dunkerque, France.
authors.forename: Dorothée
authors.initials: D
authors.lastname: Dewaelé
authors.affiliation: Université Cheikh Anta DIOP de Dakar, Laboratoire de Toxicologie et Hydrologie, BP 5005, Dakar Fann, Senegal; UMR-CNRS LOG 8187, 62930 Wimereux, France.
authors.forename: Mamadou
authors.initials: M
authors.lastname: Diop
authors.affiliation: Université Cheikh Anta DIOP de Dakar, Laboratoire de Toxicologie et Hydrologie, BP 5005, Dakar Fann, Senegal.
authors.forename: Aminata
authors.initials: A
authors.lastname: Touré
authors.affiliation: Université Cheikh Anta DIOP de Dakar, Laboratoire de Toxicologie et Hydrologie, BP 5005, Dakar Fann, Senegal.
authors.forename: Mathilde
authors.initials: M
authors.lastname: Cabral
authors.affiliation: Université du Littoral Côte d'Opale, Centre Commun de Mesures, 145 Avenue Maurice Schuman, 59140 Dunkerque, France.
authors.forename: Fabrice
authors.initials: F
authors.lastname: Cazier
authors.affiliation: Université Cheikh Anta DIOP de Dakar, Laboratoire de Toxicologie et Hydrologie, BP 5005, Dakar Fann, Senegal.
authors.forename: Mamadou
authors.initials: M
authors.lastname: Fall
authors.affiliation: Université Cheikh Anta DIOP de Dakar, Laboratoire de Toxicologie et Hydrologie, BP 5005, Dakar Fann, Senegal.
authors.forename: Amadou
authors.initials: A
authors.lastname: Diouf
authors.affiliation: Université Lille 1, Equipe Chimie Marine Bâtiment C8, Laboratoire Géosystèmes, UMR-CNRS 8217, 59655 Villeneuve d'Ascq Cedex, France. Electronic address: baghdad.ouddane@univ-lille1.fr.
authors.forename: Baghdad
authors.initials: B
authors.lastname: Ouddane
mesh_terms: D002244:Carbon; D002712:Chlorides / Q000032:analysis; D002857:Chromium / Q000032:analysis; D003035:Cobalt / Q000032:analysis; D003300:Copper / Q000032:analysis; D004784:Environmental Monitoring / Q000379:methods; D063366:Estuaries; D005843:Geography; D007854:Lead / Q000032:analysis; D008670:Metals / Q000032:analysis*; D012621:Seasons; D012623:Seawater / Q000737:chemistry; D012675:Senegal; D014131:Trace Elements / Q000032:analysis*; D014874:Water Pollutants, Chemical / Q000032:analysis*; D018508:Water Purification / Q000379:methods*
chemical_list: D002712:Chlorides; D008670:Metals; D014131:Trace Elements; D014874:Water Pollutants, Chemical; D002857:Chromium; D007854:Lead; D003035:Cobalt; D002244:Carbon; D003300:Copper
keywords: Coast; Estuary; Senegal; Speciation; Trace metals; Water column