Bioavailability Assessment of Metals from the Coastal Sediments of Tropical Estuaries Based on Acid-Volatile Sulfide and Simultaneously Extracted Metals
Ana Paula de Castro Rodrigues,
Matheus Marinho Pereira,
Aline Campos,
Tássia Lins da Silva Quaresma,
Rodrigo Pova,
Thatianne Castro Vieira,
Rút Amélia Diaz,
Manuel Moreira,
Denise Araripe,
Christiane do Nascimento Monte,
Wilson Machado
Affiliations
Ana Paula de Castro Rodrigues
Program of Geochemistry, Department of Geochemistry, Fluminense Federal University (UFF), Outeiro de São João Batista s/n, Niterói 24020-141, RJ, Brazil
Matheus Marinho Pereira
Program of Geochemistry, Department of Geochemistry, Fluminense Federal University (UFF), Outeiro de São João Batista s/n, Niterói 24020-141, RJ, Brazil
Aline Campos
Integrated Faculties Maria Thereza Oceanography and Marine Biology, Av. Visconde do Rio Branco, 869, São Domingos, Niterói 24210-006, RJ, Brazil
Tássia Lins da Silva Quaresma
Program of Geochemistry, Department of Geochemistry, Fluminense Federal University (UFF), Outeiro de São João Batista s/n, Niterói 24020-141, RJ, Brazil
Rodrigo Pova
Program of Geochemistry, Department of Geochemistry, Fluminense Federal University (UFF), Outeiro de São João Batista s/n, Niterói 24020-141, RJ, Brazil
Thatianne Castro Vieira
Program of Geochemistry, Department of Geochemistry, Fluminense Federal University (UFF), Outeiro de São João Batista s/n, Niterói 24020-141, RJ, Brazil
Rút Amélia Diaz
Program of Geochemistry, Department of Geochemistry, Fluminense Federal University (UFF), Outeiro de São João Batista s/n, Niterói 24020-141, RJ, Brazil
Manuel Moreira
Program of Geochemistry, Department of Geochemistry, Fluminense Federal University (UFF), Outeiro de São João Batista s/n, Niterói 24020-141, RJ, Brazil
Denise Araripe
Program of Chemistry, Departament of Chemistry, Fluminense Federal University (UFF), Out. de São João Batista s/n, Niterói 24020-141, RJ, Brazil
Christiane do Nascimento Monte
Program of Geochemistry, Department of Geochemistry, Fluminense Federal University (UFF), Outeiro de São João Batista s/n, Niterói 24020-141, RJ, Brazil
Wilson Machado
Program of Geochemistry, Department of Geochemistry, Fluminense Federal University (UFF), Outeiro de São João Batista s/n, Niterói 24020-141, RJ, Brazil
Bioavailability assessment is important for evaluating the risks to the local biota, and the combined use of several ecological risk indices in eutrophic environments allows the best analysis of the local reality for decision-making. The relationship between acid volatile sulfide (AVS) concentrations and simultaneously extracted metals (SEM) allows us to infer the metal holding capacity of sediment, with the objective of evaluating the potential bioavailability of trace metals (Cd, Cu, Ni, Pb, and Zn) using ecological risk indices, such as the ΣSEM/AVS model and Adverse Effect Index (AEI), in surface sediments from Guanabara Bay and Sepetiba Bay, Brazil. AVS was determined using a colorimetric method and SEM with ICP-OES. In general, almost all sampling in Sepetiba Bay showed ΣSEM/AVS ratio values above 1. However, all results for the ΣSEM/AVS ratio found for the Guanabara Bay sediments were <1 for both estuaries. After normalization by organic carbon content, a possible toxicity risk for biota was found in Sepetiba Bay. However, the AEI in Guanabara Bay was above 1 for all metals in most samples, also indicating a risk to the biota.
