Distribution of acid-volatile sulfides and simultaneously extracted metals in Guanabara Bay: combination of anthropogenic, sedimentological, and geochemical processes.

Autor: Cordeiro RC; Geochemistry Program, Department of Geochemistry, Institute of Chemistry, Federal Fluminense University, Niterói, RJ, 24020-141, Brazil. rccordeiro@id.uff.br., Santelli RE; Geochemistry Program, Department of Geochemistry, Institute of Chemistry, Federal Fluminense University, Niterói, RJ, 24020-141, Brazil.; Institute of Chemistry, Federal University of Rio de Janeiro, Rio de Janeiro, RJ, 21941-909, Brazil., Valle Machado WT; Geochemistry Program, Department of Geochemistry, Institute of Chemistry, Federal Fluminense University, Niterói, RJ, 24020-141, Brazil., Gomes AS; Marine Biology Department, Institute of Biology, Federal Fluminense University, Niterói, RJ, 24020-141, Brazil., Moreira LS; Geochemistry Program, Department of Geochemistry, Institute of Chemistry, Federal Fluminense University, Niterói, RJ, 24020-141, Brazil., Oliveira RL; Geochemistry Program, Department of Geochemistry, Institute of Chemistry, Federal Fluminense University, Niterói, RJ, 24020-141, Brazil., Abreu IM; Geochemistry Program, Department of Geochemistry, Institute of Chemistry, Federal Fluminense University, Niterói, RJ, 24020-141, Brazil.; Institute of Geosciences, Federal University of Bahia, Salvador, BA, Brazil., de Fatima Guadalupe Meniconi M; CENPES - PETROBRAS, Rio de Janeiro, Brazil.
Jazyk: angličtina
Zdroj: Environmental science and pollution research international [Environ Sci Pollut Res Int] 2024 Apr; Vol. 31 (16), pp. 24163-24179. Date of Electronic Publication: 2024 Mar 04.
DOI: 10.1007/s11356-024-32506-8
Abstrakt: Coastal sedimentary systems are affected by continental and marine metal pollutant inputs associated with different hydrodynamic characteristics and geochemical processes. These include the formation of acid-volatile sulfides (AVS) within sediments, which affects metal bioavailability and associated aquatic biota toxicity risks. Physicochemical changes in these environments in the face of extreme natural or man-made environmental influences can dramatically alter metal bioavailability and toxicity through metal binding and immobilization as insoluble sulfides. Surface sediments from Guanabara Bay, river mouths, and two mangrove areas were collected, and AVS and simultaneously extracted metals Cd, Cu, Fe, Mn, Ni, Pb, and Zn and ΣSEM were determined to assess sediment quality. A severe eutrophication history favored AVS concentrations exceeding or close to the sum-SEM concentrations, demonstrating that AVS play an important role in making trace metals unavailable for assimilation by living organisms, mitigating the risks of contamination for the local biota. This eutrophication-driven sulfide accumulation may attenuate the sediment toxicity in sites heavily polluted by metals, while some fewer eutrophic sites became more exposed to metals in excess to AVS.
(© 2024. The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part of Springer Nature.)
Databáze: MEDLINE
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