Spatiotemporal and multi-isotope assessment of metal sedimentation in the Great Lakes.

Autor: Junqueira TP; Department of Geological Sciences & Geological Engineering, Queen's University, Kingston, Ontario, Canada. Electronic address: 20tpj@queensu.ca., Araújo DF; Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER), Unité Contamination Chimique des Ecosystèmes Marins (CCEM), F-44300, Nantes, France., Jeong H; Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER), Unité Contamination Chimique des Ecosystèmes Marins (CCEM), F-44300, Nantes, France., Guatame-Garcia A; Department of Geological Sciences & Geological Engineering, Queen's University, Kingston, Ontario, Canada., Pascoe T; Water Quality Monitoring and Surveillance Division, Environment and Climate Change Canada, Burlington, Ontario, Canada., Harrison AL; Geoscience Environment Toulouse, National Scientific Research Centre (CNRS), Toulouse, France; Institute of Geological Sciences, University of Bern, Bern, Switzerland., Leybourne MI; Department of Geological Sciences & Geological Engineering, Queen's University, Kingston, Ontario, Canada; Arthur B. McDonald Canadian Astroparticle Physics Research Institute, Department of Physics, Engineering Physics & Astronomy, Queen's University, Kingston, Ontario, Canada., Smol JP; Paleoecological Environmental Assessment and Research Lab (PEARL), Department of Biology, Queen's University, Kingston, Ontario, Canada., Vriens B; Department of Geological Sciences & Geological Engineering, Queen's University, Kingston, Ontario, Canada.
Jazyk: angličtina
Zdroj: Environmental research [Environ Res] 2024 Jul 15; Vol. 253, pp. 119176. Date of Electronic Publication: 2024 May 18.
DOI: 10.1016/j.envres.2024.119176
Abstrakt: This study investigates spatiotemporal dynamics in metal sedimentation in the North American Great Lakes and their underlying biogeochemical controls. Bulk geochemical and isotope analyses of n = 72 surface and core sediment samples show that metal (Cu, Zn, Pb) concentrations and their isotopic compositions vary spatially across oligotrophic to mesotrophic settings, with intra-lake heterogeneity being similar or higher than inter-lake (basin-scale) variability. Concentrations of Cu, Zn, and Pb in sediments from Lake Huron and Lake Erie vary from 5 to 73 mg/kg, 18-580 mg/kg, and 5-168 mg/kg, respectively, but metal enrichment factors were small (<2) across the surface- and core sediments. The isotopic signatures of surface sediment Cu (δ 65 Cu between -1.19‰ and +0.96‰), Zn (δ 66 Zn between -0.09‰ and +0.41‰) and Pb ( 206/207 Pb from 1.200 to 1.263) indicate predominantly lithogenic metal sourcing. In addition, temporal trends in sediment cores from Lake Huron and Lake Erie show uniform metal concentrations, minor enrichment, and Zn and Pb isotopic signatures suggestive of negligible in-lake biogeochemical fractionation. In contrast, Cu isotopic signatures and correlation to chlorophyll and macronutrient levels suggest more differentiation from source variability and/or redox-dependent fractionation, likely related to biological scavenging. Our results are used to derive baseline metal sedimentation fluxes and will help optimize water quality management and strategies for reducing metal loads and enrichment in the Great Lakes and beyond.
Competing Interests: Declaration of competing interest The authors declare the following financial interests/personal relationships which may be considered as potential competing interests:Bas Vriens reports financial support was provided by Natural Sciences and Engineering Research Council of Canada. Bas Vriens reports financial support was provided by Canadian Foundation for Innovation. Bas Vriens reports a relationship with Natural Sciences and Engineering Research Council of Canada that includes: funding grants. Bas Vriens reports a relationship with Canadian Foundation for Innovation that includes: funding grants. 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 The Authors. Published by Elsevier Inc. All rights reserved.)
Databáze: MEDLINE
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