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Zn isotopes in the suspended load of the Seine River, France: Isotopic variations and source determination

Abstract : We report Zn isotopic ratios (d66Zn) of river suspended particulate matter (SPM) and floodplain deposits (FD) from the Seine basin, France, with a precision < 0.05 per mil. A decrease in d66Zn from 0.30 per mil to 0.08 per mil is observed in SPM from the upstream to downstream parts of the fluvial system, associated with an increase in Zn concentration from 100 ppm to 400 ppm. The Zn/Al of SPM at the river mouth is up to five times greater than the Zn/Al of the natural background, and by normalizing to the later value we define a Zn enrichment factor. Suspended sediments from a temporal series of samples collected in Paris display a similar variation in d66Zn of between 0.08 per mil and 0.26 per mil, while showing an inverse relationship between the Zn enrichment factor and d66Zn. The amount of Zn transported as suspended load varies from 10% to 90%, as a function of increasing discharge. The d66Zn of SPM and the dissolved load are correlated, suggesting that adsorption processes are probably not the dominant process by which the Zn enrichment of SPM takes place. Instead, we interpret our data as reflecting the mixture of two main populations of suspended particles with distinct d66Zn. The first is characteristic of natural silicate particles transported by erosion processes to the river, while the second likely represents anthropogenic particles derived from wastewater treatment plants or combined sewer overflows. Based on isotopic ratios, we calculate that 70% of Zn in SPM of the Seine River in Paris is of anthropogenic origin.
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Contributor : Sylvain Huon Connect in order to contact the contributor
Submitted on : Monday, June 22, 2009 - 10:13:22 AM
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Jiubin Chen, Jérôme Gaillardet, Pascale Louvat, Sylvain Huon. Zn isotopes in the suspended load of the Seine River, France: Isotopic variations and source determination. Geochimica et Cosmochimica Acta, Elsevier, 2009, 73, pp.4060-4076. ⟨10.1016/j.gca.2009.04.017⟩. ⟨bioemco-00397422⟩



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