title: Seasonal variations of coastal sedimentary trace metals cycling: insight on the effect of manganese and iron (oxy)hydroxides, sulphide and organic matter.
abstract: The combination of analysis, multivariate treatment (PCA) and chemical speciation calculation confirmed the control of Fe, Mn, sulphide and organic matter on metals dynamics in coastal sediments (0-5 cm surface sediments and sediments cores) of Toulon Bay (NW Mediterranean). The temporal monitoring of the physic-chemical parameters as well as the dissolved/particulate minor (Fe/Mn) and trace elements (i.e. Ag, Cd, Co, Cu, Ni, Pb, Zn, …) concentrations in porewaters and sediments were assessed. Multivariate treatment revealed different behaviours for marine elements, terrestrial ones and contaminants. Seasonal variations of metals mobilization in porewater were observed, related to diagenesis activity. Element mobility was studied by selective extractions (ascorbate, acid and alkaline) on sediments. Thermodynamic simulation (PHREEQC) was performed to calculate the elemental dissolved speciation, the mineral saturation index and then to simulate the solid/liquid interaction through precipitation processes, studying the contrasted influence of dissolved organic matter and sulphide.
authors.affiliation: Université de Toulon, PROTEE, EA 3819, 83957 La Garde, France.
authors.forename: Duc Huy
authors.initials: DH
authors.lastname: Dang
authors.affiliation: Université de Toulon, PROTEE, EA 3819, 83957 La Garde, France.
authors.forename: Véronique
authors.initials: V
authors.lastname: Lenoble
authors.affiliation: Université de Toulon, PROTEE, EA 3819, 83957 La Garde, France.
authors.forename: Gaël
authors.initials: G
authors.lastname: Durrieu
authors.affiliation: Center for Marine and Environmental Research, Ruđer Bošković Institute, P.O. Box 180, 10002 Zagreb, Croatia.
authors.forename: Dario
authors.initials: D
authors.lastname: Omanović
authors.affiliation: LASEM-Toulon, Base Navale De Toulon, BP 61, 83800 Toulon, France.
authors.forename: Jean-Ulrich
authors.initials: JU
authors.lastname: Mullot
authors.affiliation: Université de Toulon, PROTEE, EA 3819, 83957 La Garde, France.
authors.forename: Stéphane
authors.initials: S
authors.lastname: Mounier
authors.affiliation: Université de Toulon, PROTEE, EA 3819, 83957 La Garde, France. Electronic address: cgarnier@univ-tln.fr.
authors.forename: Cédric
authors.initials: C
authors.lastname: Garnier
mesh_terms: D019015:Geologic Sediments / Q000737:chemistry*; D006878:Hydroxides / Q000032:analysis / Q000737:chemistry*; D007501:Iron / Q000032:analysis / Q000737:chemistry; D008345:Manganese / Q000032:analysis; D008670:Metals / Q000032:analysis / Q000737:chemistry*; D008962:Models, Theoretical; D012621:Seasons; D013440:Sulfides / Q000032:analysis / Q000737:chemistry*; D014874:Water Pollutants, Chemical / Q000032:analysis* / Q000737:chemistry
chemical_list: D006878:Hydroxides; D008670:Metals; D013440:Sulfides; D014874:Water Pollutants, Chemical; D008345:Manganese; D007501:Iron
keywords: Coastal sediments; Modelling; Organic matter; Seasonal variations; Sulphide; Trace metals cycling