Uranium contamination of bivalve Mytilus galloprovincialis, speciation and localization.

Autor: Stefanelli R; Université Côte d'Azur, CNRS, Institut de Chimie de Nice, 06108 Nice, France; CEA, DAM, DIF, F-91297 Arpajon, France., Beccia MR; Université Côte d'Azur, CNRS, Institut de Chimie de Nice, 06108 Nice, France., Solari PL; Synchrotron Soleil, L'Orme des Merisiers, Saint-Aubin, BP 48, F-91192 Gif-sur-Yvette Cedex, France., Suhard D; Institut de Radioprotection et de Sûreté Nucléaire (IRSN), PSE-SANTE/SESANE/LRSI, Fontenay-aux-Roses 92260, France., Pagnotta S; Université Côte d'Azur, Centre Commun de Microscopie Appliquée, 06108 Nice France., Jeanson A; Université Côte d'Azur, CNRS, Institut de Chimie de Nice, 06108 Nice, France., Mullot JU; Toulon Naval Base, LASEM, BP 61, 83800 Toulon Cedex 9 France., Vernier F; Toulon Naval Base, LASEM, BP 61, 83800 Toulon Cedex 9 France., Moulin C; CEA, DAM, DIF, F-91297 Arpajon, France., Monfort M; CEA, DAM, DIF, F-91297 Arpajon, France., Aupiais J; CEA, DAM, DIF, F-91297 Arpajon, France., Den Auwer C; Université Côte d'Azur, CNRS, Institut de Chimie de Nice, 06108 Nice, France. Electronic address: christophe.denauwer@univ-cotedazur.fr.
Jazyk: angličtina
Zdroj: Environmental research [Environ Res] 2024 Jul 01; Vol. 252 (Pt 2), pp. 118877. Date of Electronic Publication: 2024 Apr 11.
DOI: 10.1016/j.envres.2024.118877
Abstrakt: Uranium is a natural radioelement (also a model for heavier actinides), but may be released through anthropogenic activities. In order to assess its environmental impact in a given ecosystem, such as the marine system, it is essential to understand its distribution and speciation, and also to quantify its bioaccumulation. Our objective was to improve our understanding of the transfer and accumulation of uranium in marine biota with mussels taken here as sentinel species because of their sedentary nature and ability to filter seawater. We report here on the investigation of uranium accumulation, speciation, and localization in Mytilus galloprovincialis using a combination of several analytical (Inductively Coupled Plasma Mass Spectrometry, ICP-MS), spectroscopic (X ray Absorption Spectroscopy, XAS, Time Resolved Laser Induced Fluorescence Spectroscopy, TRLIFS), and imaging (Transmission Electron Microscopy, TEM, μ-XAS, Secondary Ion Mass Spectrometry, SIMS) techniques. Two cohorts of mussels from the Toulon Naval Base and the Villefranche-sur-Mer location were studied. The measurement of uranium Concentration Factor (CF) values show a clear trend in the organs of M. galloprovincialis: hepatopancreas ≫ gill > body ≥ mantle > foot. Although CF values for the entire mussel are comparable for TNB and VFM, hepatopancreas values show a significant increase in those from Toulon versus Villefranche-sur-Mer. Two organs of interest were selected for further spectroscopic investigations: the byssus and the hepatopancreas. In both cases, U(VI) (uranyl) is accumulated in a diffuse pattern, most probably linked to protein complexing functions, with the absence of a condensed phase. While such speciation studies on marine organisms can be challenging, they are an essential step for deciphering the impact of metallic radionuclides on the marine biota in the case of accidental release. Following our assumptions on uranyl speciation in both byssus and hepatopancreas, further steps will include the inventory and identification of the proteins or metabolites involved.
Competing Interests: Declaration of competing interest The authors declare the following financial interests/personal relationships which may be considered as potential competing interests: DEN AUWER Christophe reports financial support was provided by French Alternative Energies and Atomic Energy Commission. If there are other authors, they declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
(Copyright © 2024 Elsevier Inc. All rights reserved.)
Databáze: MEDLINE
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