title: Influence of effluent organic matter on copper speciation and bioavailability in rivers under strong urban pressure.
abstract: This study focuses on spatiotemporal variations in the type of dissolved organic matter (DOM) and copper binding ability both upstream and downstream of Paris. It also compares the relative influence of both natural DOM upstream of Paris and effluent dissolved organic matter (EfDOM) output from a wastewater treatment plant (WWTP) on trace metal speciation and bioavailability in aquatic systems. In addition to the typical high- and low-affinity binding sites, a third family of very high-affinity binding sites has been highlighted for EfDOM. In receiving waters downstream of Paris during low-flow periods, the percentage of high- and very high-affinity sites originating from EfDOM reaches nearly 60 %. According to the speciation computation, the free copper concentration upstream of Paris exceeds the downstream Paris concentration by a factor of 2 to 4. As regards copper bioavailability, the highest EC50tot values were observed for EfDOM and downstream DOM, with a very low aromaticity and low UV absorbance. This finding suggests that specific ultraviolet absorbance (SUVA) is unlikely to be useful in assessing metal speciation and toxicity in aquatic systems subject to strong urban pressures. These results also highlight that the copper speciation computation for surface water exposed to considerable human pressures should include not only the humic and/or fulvic part of dissolved organic carbon but more hydrophilic fractions as well, originating for example from EfDOM.
authors.affiliation: Université Paris-Est, LEESU, UMR MA 102, UPEC, 61 av. du Gal de Gaulle, 94010, Créteil Cedex, France.|Faculty of Sciences-I, Lebanese University, Beirut, Lebanon.
authors.forename: Z
authors.initials: Z
authors.lastname: Matar
authors.affiliation: Université Paris-Est, LEESU, UMR MA 102, UPEC, 61 av. du Gal de Gaulle, 94010, Créteil Cedex, France.
authors.forename: C
authors.initials: C
authors.lastname: Soares Pereira
authors.affiliation: Université Paris Est, LEESU, UMR MA 102, ENPC, 6-8 avenue Blaise Pascal, 77455, Champs-sur-Marne, France.|Faculty of Engineering, Lebanese University, Beirut, Lebanon.
authors.forename: G
authors.initials: G
authors.lastname: Chebbo
authors.affiliation: IRSTEA, Unité Rech Hydrosyst & Bioprocédés, F-92613, Antony, France.
authors.forename: E
authors.initials: E
authors.lastname: Uher
authors.affiliation: Université Paris-Est, LEESU, UMR MA 102, UPEC, 61 av. du Gal de Gaulle, 94010, Créteil Cedex, France.
authors.forename: M
authors.initials: M
authors.lastname: Troupel
authors.affiliation: Université Paris-Est, LEESU, UMR MA 102, UPEC, 61 av. du Gal de Gaulle, 94010, Créteil Cedex, France.
authors.forename: L
authors.initials: L
authors.lastname: Boudahmane
authors.affiliation: Université Paris Est, LEESU, UMR MA 102, ENPC, 6-8 avenue Blaise Pascal, 77455, Champs-sur-Marne, France.
authors.forename: M
authors.initials: M
authors.lastname: Saad
authors.affiliation: IRSTEA, Unité Rech Hydrosyst & Bioprocédés, F-92613, Antony, France.
authors.forename: C
authors.initials: C
authors.lastname: Gourlay-France
authors.affiliation: SIAAP Direction du Développement et de la Prospective, 82 avenue Kléber, F-92700, Colombes, France.
authors.forename: V
authors.initials: V
authors.lastname: Rocher
authors.affiliation: Université Paris-Est, LEESU, UMR MA 102, UPEC, 61 av. du Gal de Gaulle, 94010, Créteil Cedex, France. varrault@u-pec.fr.
authors.forename: Gilles
authors.initials: G
authors.lastname: Varrault
mesh_terms: D003300:Copper / Q000032:analysis*; D004784:Environmental Monitoring; D006801:Humans; D008670:Metals / Q000737:chemistry; D010297:Paris; D045483:Rivers / Q000737:chemistry*; D062065:Wastewater / Q000032:analysis*; D014874:Water Pollutants, Chemical / Q000032:analysis*
chemical_list: D003300:Copper; D008670:Metals; D062065:Wastewater; D014874:Water Pollutants, Chemical
keywords: Bioavailability; Biotic ligand model; Dissolved organic matter; EfDOM; Hydrophilic organic matter; Speciation; Trace metals