title: Application of δ(18)O, δ(13)CDIC, and major ions to evaluate micropollutant sources in the Bay of Vidy, Lake Geneva.
abstract: Waters were sampled monthly from a profile at the wastewater outlet and a reference point in the Bay of Vidy (Lake Geneva) for a year. The samples were analyzed for (18)O/(16)O of water, (13)C/(12)C of dissolved inorganic carbon (DIC), major ions, and selected micropollutant concentrations. δ(18)O values, combined with the major ion concentrations, allowed discharged waste and storm-drainage water to be traced within the water column. On the basis of δ(18)O values, mole fractions of wastewater (up to 45 %), storm-drainage (up to 16 %), and interflowing Rhône River water (up to 34 %) could be determined. The results suggest that the stormwater fractions do not influence micropollutant concentrations in a measurable way. In contrast, the Rhône River interflow coincides with elevated concentrations of Rhône River-derived micropollutants in some profiles. δ(13)C values of DIC suggest that an increase in micropollutant concentrations at the sediment-water interface could be related to remineralization processes or resuspension.
authors.affiliation: a Faculty of Geosciences and Environment, Géopolis , Institute of Earth Surface Dynamics, Université de Lausanne , Lausanne , Switzerland.
authors.forename: Janine
authors.initials: J
authors.lastname: Halder
authors.affiliation: a Faculty of Geosciences and Environment, Géopolis , Institute of Earth Surface Dynamics, Université de Lausanne , Lausanne , Switzerland.
authors.forename: Charles
authors.initials: C
authors.lastname: Pralong
authors.affiliation: b Ecole Polytechnique Fédérale de Lausanne (EPFL), Environmental Chemistry Laboratory, School of Architecture, Civil and Environmental Engineering (ENAC) , Lausanne , Switzerland.
authors.forename: Florence
authors.initials: F
authors.lastname: Bonvin
authors.affiliation: a Faculty of Geosciences and Environment, Géopolis , Institute of Earth Surface Dynamics, Université de Lausanne , Lausanne , Switzerland.
authors.forename: Frederic
authors.initials: F
authors.lastname: Lambiel
authors.affiliation: a Faculty of Geosciences and Environment, Géopolis , Institute of Earth Surface Dynamics, Université de Lausanne , Lausanne , Switzerland.
authors.forename: Torsten W
authors.initials: TW
authors.lastname: Vennemann
mesh_terms: D002244:Carbon / Q000032:analysis*; D017554:Carbon Compounds, Inorganic / Q000032:analysis*; D002247:Carbon Isotopes / Q000032:analysis; D004784:Environmental Monitoring / Q000379:methods*; D007477:Ions / Q000032:analysis; D060106:Lakes / Q000032:analysis* / Q000737:chemistry; D010100:Oxygen / Q000032:analysis*; D010103:Oxygen Isotopes / Q000032:analysis; D013557:Switzerland; D014874:Water Pollutants, Chemical / Q000032:analysis*
chemical_list: D017554:Carbon Compounds, Inorganic; D002247:Carbon Isotopes; D007477:Ions; D010103:Oxygen Isotopes; D014874:Water Pollutants, Chemical; D002244:Carbon; D010100:Oxygen
keywords: Lake Geneva; Switzerland; carbon-13; dissolved inorganic carbon; hydrogen-2; micropollutants; oxygen-18; remineralization; wastewater