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Article Dans Une Revue Journal of South American Earth Sciences Année : 2022

Bioaccumulation of potentially toxic elements in Ammonia tepida (foraminifera) from a polluted coastal area

Wellen F. L. Castelo
  • Fonction : Auteur
Maria Virginia Alves Martins
  • Fonction : Auteur
Michael Martínez-Colón
  • Fonction : Auteur
Layla C. da Silva
  • Fonction : Auteur
Celma Menezes
  • Fonction : Auteur
Thales Oliveira
  • Fonction : Auteur
Silvia Helena de M Sousa
  • Fonction : Auteur
Orangel Aguilera
  • Fonction : Auteur
Lazaro Laut
  • Fonction : Auteur
Vanessa Laut
  • Fonction : Auteur
Wânia Duleba
  • Fonction : Auteur
Fabrizio Frontalini
  • Fonction : Auteur
Fabio Francescangeli
  • Fonction : Auteur
Mauro C. Geraldes
  • Fonction : Auteur
António T. Reis
  • Fonction : Auteur
Sérgio Bergamashi
  • Fonction : Auteur

Résumé

This work documents the presence of potentially toxic elements (PTEs) in the sediment and in tests of Ammonia tepida, one of the most common benthic foraminifera species in coastal environments worldwide. It aims to analyze if the presence of PTEs in the carbonate test of this species is related to metals concentration in the sediment aiming its application in paleoenvironmental studies. Three chambers of fifty A. tepida specimens from contaminated and uncontaminated sediments from the Sepetiba Bay, one of the most polluted coastal systems from the SE Brazil, were analyzed using an Environmental Scanning Electron Microscope coupled with an X-ray Dispersive Energy Spectrometer. The results reveal the presence of lithogenic elements and PTEs in the tests of A. tepida. Relatively high values of Pb, Hg and Sn were found in specimens recovered from both polluted and unpolluted sediment layers. The bioaccumulation index revealed higher enrichment of Cd and Cr in tests from sediments moderately to heavily polluted by Cd and to a lesser extent by Cr. The results suggest that the incorporation of metals might be controlled and affected by several factors, such as the water residence time, availability of the metals, and biogeochemical processes. As a result, applications of this method utilizing A. tepida for paleoenvironmental studies do not appear to be feasible without further research.
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Dates et versions

insu-03664869 , version 1 (11-05-2022)

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Wellen F. L. Castelo, Maria Virginia Alves Martins, Michael Martínez-Colón, Layla C. da Silva, Celma Menezes, et al.. Bioaccumulation of potentially toxic elements in Ammonia tepida (foraminifera) from a polluted coastal area. Journal of South American Earth Sciences, 2022, 115, ⟨10.1016/j.jsames.2022.103741⟩. ⟨insu-03664869⟩
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