title: Trace metals dynamics under contrasted land uses: contribution of statistical, isotopic, and EXAFS approaches.
abstract: Three sub-basins of the Seine River (France) under contrasted land uses (i.e., forested, agricultural, and urban) have been investigated in order to assess the origin and seasonal variation of trace metals, and evaluate their geochemical background and dynamics. Our results highlight a high anthropogenic impact on all elements for both the dissolved and particulate fractions. The main source for each element in the dissolved phase was determined and shows that transition and post-transition metals mainly originate from forested areas, while alkali and alkaline earth elements, metalloids, and halogens rather originate from agricultural land use. Conversely, for the particulate phase, most of the elements cannot be associated with a specific land use. Seasonal variation of elements was assessed according to the forested and agricultural land uses, and geochemical backgrounds were determined using average export rates, highlighting that the geochemical background for the forested land use is higher than the agricultural one for most of the elements. Finally, to confirm those results, Zn dynamics in the three characteristic sub-basins and between the different land uses was investigated using a combination of Zn speciation, Zn isotopic ratio, and Zn export rates.
authors.affiliation: Institut de Physique du Globe de Paris, Sorbonne Paris Cité, Université Paris Diderot, UMR 7154 CNRS, 75005, Paris, France.
authors.forename: Caroline A
authors.initials: CA
authors.lastname: Bonnot
authors.affiliation: Institut de Physique du Globe de Paris, Sorbonne Paris Cité, Université Paris Diderot, UMR 7154 CNRS, 75005, Paris, France. gelabert@ipgp.fr.
authors.forename: Alexandre
authors.initials: A
authors.lastname: Gélabert
authors.affiliation: Institut de Physique du Globe de Paris, Sorbonne Paris Cité, Université Paris Diderot, UMR 7154 CNRS, 75005, Paris, France.
authors.forename: Pascale
authors.initials: P
authors.lastname: Louvat
authors.affiliation: Institut de Minéralogie, Physique des Matériaux et Cosmochimie (IMPMC), UMR CNRS 7590, Université Pierre et Marie Curie (UPMC), UR IRD 206, MNHN, Campus Jussieu, 75252, Paris CEDEX 05, France.
authors.forename: Guillaume
authors.initials: G
authors.lastname: Morin
authors.affiliation: Observatoire des Sciences de l'Univers de Grenoble, UMS 832 CNRS Université Joseph Fourier, 38041, Grenoble CEDEX 9, France.
authors.forename: Olivier
authors.initials: O
authors.lastname: Proux
authors.affiliation: Institut de Physique du Globe de Paris, Sorbonne Paris Cité, Université Paris Diderot, UMR 7154 CNRS, 75005, Paris, France.
authors.forename: Marc F
authors.initials: MF
authors.lastname: Benedetti
mesh_terms: D000383:Agriculture; D004784:Environmental Monitoring / Q000379:methods* / Q000706:statistics & numerical data; D065928:Forests; D005602:France; D058955:Metalloids / Q000032:analysis; D008670:Metals / Q000032:analysis*; D045483:Rivers; D012621:Seasons; D014131:Trace Elements / Q000032:analysis; D014507:Urbanization; D014874:Water Pollutants, Chemical / Q000032:analysis*; D014877:Water Pollution, Chemical / Q000032:analysis / Q000706:statistics & numerical data; D056928:X-Ray Absorption Spectroscopy; D015032:Zinc / Q000032:analysis
chemical_list: D058955:Metalloids; D008670:Metals; D014131:Trace Elements; D014874:Water Pollutants, Chemical; D015032:Zinc
keywords: Agriculture; Forest; Geochemical background; Land use; Sediments; Seine River; Trace metals; Zinc