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Characterization of the nature of the suspended particles transported during the low water levels of the Rhône River (France) - CANADER project

Abstract : Studies conducted on the Rhône River (France) highlights that, in the current context of climate change, the frequency of lowflow situations are likely to increase throughout its basin. For these extreme periods, it is expected that the proportion of organic matter (OM) contained in suspended particles will increase. However, the fixation of several contaminants is strongly linked to OM, where its form favors their complexation/adsorption. This is confirmed by the results of the CANADER project conducted on the Rhône River and its main tributaries (Saône, Ardèche and Durance Rivers) where the concentrations in suspended solids of several contaminants (anthropogenic metals, mercury and radionuclides) tend to increase during low water periods. For several anthropogenic metals (Cr, Ni, Zn), concentrations sometimes exceed the probable effect concentration (PEC). The decrease on natural metals (from the earth's crust) coupled with the increase in methyl-mercury (suggesting bioaccumulation of concentrations in phytoplankton) shows that a significant proportion of the OM that transits at low flow is autochthonous. The first results of sterol analysis suggest that OM origins differ depending the Rhône River and its tributaries, and further work must be done to characterize the sources of these particles.
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https://hal.archives-ouvertes.fr/hal-03356816
Contributor : Corinne Pardo Connect in order to contact the contributor
Submitted on : Wednesday, September 29, 2021 - 10:28:03 AM
Last modification on : Tuesday, October 19, 2021 - 10:59:35 PM

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Hugo Lepage, Olivier Radakovitch, David Mourier, Franck Giner, Jf Rontani, et al.. Characterization of the nature of the suspended particles transported during the low water levels of the Rhône River (France) - CANADER project. International symposium of LabEx DRIIHM, Sep 2021, Toulouse, France. ⟨10.34972/driihm-999a90⟩. ⟨hal-03356816⟩

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