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Isotopic analysis of Cd in the mixing zone of Siberian rivers with the Arctic Ocean-New constraints on marine Cd cycling and the isotope composition of riverine Cd
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2013 (English)In: Earth and Planetary Science Letters, ISSN 0012-821X, E-ISSN 1385-013X, Vol. 361Article in journal (Refereed) Published
Abstract [en]

The Cd concentrations and isotopic compositions were determined for 19 water samples which cover the mixing zones of four major rivers with the coastal seas of the Siberian Shelf. The waters span salinities from about 1-32, with Cd concentrations of about 0.02-0.46 nmol/kg and small but resolvable Cd isotope fractionations, with epsilon Cd-114/110 values of between +1.4 and +5.7. The data for the majority of the samples are in accord with the systematics expected for quasi-binary mixing of Arctic seawater (epsilon Cd-114/110 approximate to 5.5 +/- 0.5 and Cd concentration between 0.1 and 0.25 nmol/kg) with river waters characterized by epsilon Cd-114/110 approximate to 2 +/- 1 and low pristine Cd contents of about 0.02-0.06 nmol/kg. The river values are similar to the inferred composition of the continental crust, which implies that weathering produces no or only limited Cd isotope fractionation. The results for five samples provide clear evidence for non-conservative behaviour of Cd, as the element is released from suspended riverine particles during mixing with seawater. The isotopic data furthermore show that the desorbed Cd is characterized by epsilon Cd-114/110 approximate to +3 in accord with a natural origin. This implies that the (natural) net riverine Cd fluxes of the Siberian rivers to seawater are also likely to be characterized by epsilon Cd-114/110 approximate to 2 +/- 1, a value that is either identical to or intermediate between the composition of the continental crust and marine deep waters. Additional data for the boreal Kalix River in Sweden contrasts with the results obtained for the Siberian rivers, as the former exhibits a much lighter Cd isotope composition of epsilon Cd-114/110 = -3.8 coupled with a much higher Cd content of similar to 0.24 nmol/kg. These characteristics appear to be a consequence of the distinct hydro-geological setting of the Kalix drainage basin, which suggests that the riverine input of Cd isotopes to the oceans might display significant regional variability. In summary, our study underlines the important role that stable isotope analyses can play in biogeochemical investigations of trace metals. Here, the Cd isotope results provide important constraints, which are not available from concentration data alone, on the cycling of Cd in riverine and shelf environments. (C) 2012 Elsevier B.V. All rights reserved.

Place, publisher, year, edition, pages
2013. Vol. 361
Keyword [en]
marine geochemistry cadmium isotopes cadmium concentration Siberian Shelf Arctic rivers mixing trace-elements boreal river rhone river lena river cadmium geochemistry behavior russia france water Geochemistry & Geophysics
Research subject
SWEDARCTIC 2008, ISSS-08
Identifiers
URN: urn:nbn:se:polar:diva-1911DOI: 10.1016/j.epsl.2012.11.034OAI: oai:DiVA.org:polar-1911DiVA: diva2:810410
Note

ISI Document Delivery No.: 089JO Times Cited: 4 Cited Reference Count: 54 Lambelet, Myriam Rehkaemper, Mark de Flierdt, Tina van Xue, Zichen Kreissig, Katharina Coles, Barry Porcelli, Don Andersson, Per Knut and Alice Wallenberg Foundation; Far Eastern Branch of the Russian Academy of Sciences; Swedish Research Council (VR) [621-2004-4283]; US National Oceanic and Atmospheric Administration; Russian Foundation of Basic Research; Swedish Polar Research Secretariat; Stockholm University Bert Bolin Centre for Climate Research; Marie Curie Reintegration Program A particular thanks to our colleagues at the Imperial College MAGIC labs for their help and support, especially to Maxence Paul and Julie Prytulak, and to Johan Ingri for his support in the interpretation of the Kalix River results. Claudine Stirling, three anonymous referees and Gideon Henderson as editor are thanked for their insightful comments and suggestions, which helped us to shape a considerably improved revised manuscript. We are grateful to the Captain and the crew of the H/V Yacob Smirnitskyi, as well as the ISSS-08 scientific party for support of sample collection. The ISSS-08 program was supported by the Knut and Alice Wallenberg Foundation, the Far Eastern Branch of the Russian Academy of Sciences, the Swedish Research Council (VR Contract no. 621-2004-4283), the US National Oceanic and Atmospheric Administration, the Russian Foundation of Basic Research, the Swedish Polar Research Secretariat, and the Stockholm University Bert Bolin Centre for Climate Research. Tina van de Flierdt would like to acknowledge support from the Marie Curie Reintegration Program. 5 Elsevier science bv Amsterdam Geochemistry & Geophysics

Available from: 2015-05-07 Created: 2015-05-06 Last updated: 2015-05-21Bibliographically approved

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