title: Daily variations of Zn and Pb concentrations in the Deûle River in relation to the resuspension of heavily polluted sediments.
abstract: Sediments in the Deûle River (northern France) are severely polluted by metals in the vicinity of several metallurgical plants. The aim of this paper is to identify the role played by the recurrent resuspension of these polluted sediments by boat traffic on the dissolved Pb and Zn concentrations in the river. For that purpose, several high-frequency on-line monitoring campaigns were performed. Our results clearly suggest that the resuspension of sedimentary particles into the overlying water significantly increased the dissolved electrolabile Pb and Zn contents. This increase does not persist for a long time because at night and during weekends and holidays, when the boat traffic strongly slows down, Pb and Zn concentrations drop again quickly. Our data also indicate that the biological processes (such as photosynthetic and respiration activities), diffusive and benthic fluxes, as well as dilution of pore water into the overlying water during sediment remobilization do not contribute significantly to the sharp increase of dissolved Pb and Zn concentrations in the river during the day. The good correlation between turbidity and electrolabile metal concentration allows us to discard slow AVS (Acid Volatile Sulfides) oxidation as well. Desorption of metals from sediment particles was clearly the most relevant process, responsible for the increase of dissolved Pb and Zn concentrations in the water column.
authors.affiliation: Université Lille 1, Laboratoire Géosystèmes, UMR CNRS 8217, CNRS - Université Lille 1, Avenue Paul Langevin, 59655 Villeneuve d'Ascq, France.
authors.forename: Pierre-Jean
authors.initials: PJ
authors.lastname: Superville
authors.affiliation: Université Lille 1, Laboratoire Géosystèmes, UMR CNRS 8217, CNRS - Université Lille 1, Avenue Paul Langevin, 59655 Villeneuve d'Ascq, France.
authors.forename: Emilie
authors.initials: E
authors.lastname: Prygiel
authors.affiliation: Vrije Universiteit, Brussel (VUB), Laboratory of Analytical and Environmental Chemistry (ANCH), Brussels, Belgium; IRSTEA, UR MALY, 5 rue de la Doua, CS 70077, 69626 Villeurbanne Cedex, France.
authors.forename: Aurélie
authors.initials: A
authors.lastname: Magnier
authors.affiliation: Université Lille 1, Laboratoire Géosystèmes, UMR CNRS 8217, CNRS - Université Lille 1, Avenue Paul Langevin, 59655 Villeneuve d'Ascq, France.
authors.forename: Ludovic
authors.initials: L
authors.lastname: Lesven
authors.affiliation: Vrije Universiteit, Brussel (VUB), Laboratory of Analytical and Environmental Chemistry (ANCH), Brussels, Belgium.
authors.forename: Yue
authors.initials: Y
authors.lastname: Gao
authors.affiliation: Vrije Universiteit, Brussel (VUB), Laboratory of Analytical and Environmental Chemistry (ANCH), Brussels, Belgium.
authors.forename: Willy
authors.initials: W
authors.lastname: Baeyens
authors.affiliation: Université Lille 1, Laboratoire Géosystèmes, UMR CNRS 8217, CNRS - Université Lille 1, Avenue Paul Langevin, 59655 Villeneuve d'Ascq, France.
authors.forename: Baghdad
authors.initials: B
authors.lastname: Ouddane
authors.affiliation: Université Lille 1, Laboratoire Géosystèmes, UMR CNRS 8217, CNRS - Université Lille 1, Avenue Paul Langevin, 59655 Villeneuve d'Ascq, France.
authors.forename: David
authors.initials: D
authors.lastname: Dumoulin
authors.affiliation: Université Lille 1, Laboratoire Géosystèmes, UMR CNRS 8217, CNRS - Université Lille 1, Avenue Paul Langevin, 59655 Villeneuve d'Ascq, France. Electronic address: gabriel.billon@univ-lille1.fr.
authors.forename: Gabriel
authors.initials: G
authors.lastname: Billon
mesh_terms: D004784:Environmental Monitoring; D019015:Geologic Sediments / Q000737:chemistry; D007854:Lead / Q000032:analysis; D008669:Metallurgy; D008670:Metals / Q000032:analysis*; D045483:Rivers / Q000737:chemistry*; D014874:Water Pollutants, Chemical / Q000032:analysis*; D014877:Water Pollution, Chemical / Q000706:statistics & numerical data; D015032:Zinc / Q000032:analysis
chemical_list: D008670:Metals; D014874:Water Pollutants, Chemical; D007854:Lead; D015032:Zinc
keywords: Remobilization; Resuspension; Sediment; Sorption; Trace metals; Water