Trace element uptake by macroalgae: Organic colloids as a source of metals, including Fe and rare earth elements.

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  • Additional Information
    • Source:
      Publisher: Elsevier Science Ltd Country of Publication: England NLM ID: 0320657 Publication Model: Print-Electronic Cited Medium: Internet ISSN: 1879-1298 (Electronic) Linking ISSN: 00456535 NLM ISO Abbreviation: Chemosphere Subsets: MEDLINE
    • Publication Information:
      Publication: Oxford : Elsevier Science Ltd
      Original Publication: Oxford, New York, : Pergamon Press.
    • Subject Terms:
      Metals, Rare Earth*/metabolism ; Metals, Rare Earth*/analysis ; Seaweed*/metabolism ; Seaweed*/chemistry ; Colloids* ; Trace Elements*/analysis ; Trace Elements*/metabolism ; Iron*/metabolism; Water Pollutants, Chemical/analysis ; Water Pollutants, Chemical/metabolism ; Environmental Monitoring ; France ; Seawater/chemistry ; Metals/analysis ; Metals/metabolism ; Ascophyllum/chemistry ; Ascophyllum/metabolism ; Ecosystem
    • Abstract:
      We determined the concentrations of trace elements including Fe, Al, rare earth elements and Y (REY), in Ascophyllum nodosum, one of the most abundant brown macroalgae in the North Atlantic. Samples were collected in the Bay of Brest (Brittany, France) and in the estuary of its main contributing river. The Y/Ho, Al/Ga, and Zr/Hf ratios display values distinctive from seawater, but similar to the continental crust; an observation which we show cannot be explained by the incorporation of terrigenous particles, nor inorganic colloids. On the other hand, REY, Ga, Al, as well as other trace elements such as Th, Sc, Pb and Cr, correlate strongly with Fe abundances. Since all these elements are chiefly carried by organic colloids, we propose that colloidal uptake onto the surface of the algae controls the bioaccumulation of these metals. Their assimilation or internalization by algae requires biological pathways yet to be determined. This process is vital for these organisms, as organic colloids appear to be their main source of Fe, an essential nutrient. However, it also allows the accumulation of some potentially toxic metals in algae (e.g., Pb), with implications on the overall health of coastal ecosystems.
      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 © 2024 Elsevier Ltd. All rights reserved.)
    • Contributed Indexing:
      Keywords: Ascophyllum nodosum; Bioaccumulation; Colloid; Rare earth elements (REE); Seaweed; Trace elements
    • Accession Number:
      0 (Metals, Rare Earth)
      0 (Colloids)
      0 (Trace Elements)
      E1UOL152H7 (Iron)
      0 (Water Pollutants, Chemical)
      0 (Metals)
    • Publication Date:
      Date Created: 20241130 Date Completed: 20241218 Latest Revision: 20241218
    • Publication Date:
      20241219
    • Accession Number:
      10.1016/j.chemosphere.2024.143849
    • Accession Number:
      39615852