Recent and present sedimentary fluxes of heavy metals and radionuclides in oligotrophic Lake Annecy, France

Article Article scientifique Article Recent and present sedimentary fluxes of heavy metals and radionuclides in oligotrophic Lake Annecy, France eng 2003 author Loizeau Jean-Luc 0000-0002-0611-0388 23020 author Arpagaus Philippe 27381 author Mathieu Daniel Albert Lucien 96507 author Dominik Janusz 22088 789-792 10.1051/jp4:20030419 1155-4339 http://www.edpsciences.org/10.1051/jp4:20030419 The present study focuses on two aspects of heavy metals and radionuclide fluxes to lake Annecy: a long term. secular evolution by analysing dated sediment cores, and a short term, seasonal evolution through the analysis of settling particles collected by sediment traps. Compared to background values prior to 1900, sediment cores reveal a two-fold (Cd, Cu, Zn) to a four-fold (Pb) increase in heavy metal concentration after the 40s, and a smaller decrease after the 70s except for Cu, which does not decrease. Sediment traps moored from April 1998 to November 2000 record strong variations of particles (range: 0.5 - 6.1 g m(-2) d(-1)), organic matter (range 0.03 - 0.27 g m(-2) d(-1)) and carbonate fluxes (range: 0.2 - 4.9 g m(-2) d(-1)). The maximum fluxes are observed at the end of spring and summer, related to increased phytoplankton production. Mean annual heavy metal fluxes (0.014 mug.cm(-2).y(-1) for Cd, 1 mug.cm(-2). y(-1) for Ph and Cu and 2.8 mug.cm(-2).y(-1) for Zn) are lower than those recorded in the surface layers of the sediment cores. No relation has been observed between fluxes of heavy metal and of particles. Comparison of heavy metal fluxes in Lake Annecy with two other peri-alpine lakes show that this lake receive more Cu and Ph of anthropogenic origin, in spite of the sewage collector built around the lake. Dewey 550 41 Département F.-A. Forel des sciences de l'environnement et de l'eau 153 false Journal de physique. IV 107 6344af19-8f02-4da9-bdad-0ac8268d5fed Article (Published version) Private Loizeau et al 2003 J Physique.pdf 260988 application/pdf closedAccess Faculté des sciences / Section des sciences de la Terre et de l'Environnement / Département F.-A. Forel des sciences de l'environnement et de l'eau

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Recent and present sedimentary fluxes of heavy metals and radionuclides in oligotrophic Lake Annecy, France	Journal de physique. IV			2003	737	0

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Mathieu, Daniel Albert Lucien