Vanishing lead in the Loire River estuary: An example of successful environmental regulation.

Autor: Briant N; Ifremer, CCEM Contamination Chimique des Écosystèmes Marins, F-44000, Nantes, France. Electronic address: nicolas.briant@ifremer.fr., Knoery J; Ifremer, CCEM Contamination Chimique des Écosystèmes Marins, F-44000, Nantes, France., Araújo DF; Ifremer, CCEM Contamination Chimique des Écosystèmes Marins, F-44000, Nantes, France., Ponzevera E; Ifremer, CCEM Contamination Chimique des Écosystèmes Marins, F-44000, Nantes, France., Chouvelon T; Ifremer, CCEM Contamination Chimique des Écosystèmes Marins, F-44000, Nantes, France; Observatoire Pelagis, UAR 3462, La Rochelle Université - CNRS, F-17000, La Rochelle, France., Bruzac S; Ifremer, CCEM Contamination Chimique des Écosystèmes Marins, F-44000, Nantes, France., Sireau T; Ifremer, CCEM Contamination Chimique des Écosystèmes Marins, F-44000, Nantes, France., Thomas B; Ifremer, CCEM Contamination Chimique des Écosystèmes Marins, F-44000, Nantes, France., Mojtahid M; Université d'Angers, Nantes Université, Le Mans Université, CNRS, Laboratoire de Planétologie et Géosciences, LPG UMR 6112, 49000, Angers, France., Metzger E; Université d'Angers, Nantes Université, Le Mans Université, CNRS, Laboratoire de Planétologie et Géosciences, LPG UMR 6112, 49000, Angers, France., Brach-Papa C; Ifremer, LITTORAL, F-83500, La Seyne sur Mer, France.
Jazyk: angličtina
Zdroj: Environmental pollution (Barking, Essex : 1987) [Environ Pollut] 2024 Jan 01; Vol. 340 (Pt 1), pp. 122860. Date of Electronic Publication: 2023 Nov 02.
DOI: 10.1016/j.envpol.2023.122860
Abstrakt: The behavior, and history of lead (Pb) contamination in the ecosystem of the Loire estuary was examined using elemental concentrations and Pb isotope data in water, sediment, bivalves, shrimps, and fish. In the estuary and in the surrounding coastal area, Pb concentrations in water and sediment decreased compared to concentrations determined in the 1980s, with concentrations ranging from 15.8 to 65.7 mg kg -1 in the surface sediment, 0.04-0.26 nM in the water column, and 48.0-77.9 mg kg -1 in suspended particles. Pb biomonitoring using blue mussels collected by the French Mussel Watch Program over the last 40 years showed a concentration decrease from 3.8 to 0.8 mg kg -1 . A similar trend is observed in an estuarine sediment core. Changes in accompanying Pb isotope compositions strongly suggest a binary mixing process between Pb derived from terrigenous material and anthropogenic sources. Thus, environmental regulations restricting the release of lead into the environment contribute to a decrease in estuarine levels of this pollutant, which occurs on a decadal time scale.
Competing Interests: Declaration of competing interest The authors 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 © 2023 Elsevier Ltd. All rights reserved.)
Databáze: MEDLINE
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