Ecological risks associated to trace metals of contaminated sediments from a densely urbanized tropical eutrophic estuary

Monte, Christiane do Nascimento; Rodrigues, Ana Paula de Castro; Freitas, Alexandre Rafael de; Braz, Bernardo Ferreira; Freire, Aline Soares; Cordeiro, Renato Campello; Santelli, Ricardo Erthal; Machado, Wilson

doi:10.1007/s10661-021-09552-7

Cited by 8 publications

(11 citation statements)

References 53 publications

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“…Guanabara Bay (GB) is one of the largest urban bays in the world and suffers from discharge of untreated industrial and domestic sewage [7]. This ecosystem is considered eutrophic to hypereutrophic, due to the high organic load [7,20,26]. In addition, contamination by metals such as Cr, Cu, Hg, Pb, and Zn in the northwestern region of the bay has been reported [2,20,27].…”

Section: Study Areamentioning

confidence: 99%

“…This ecosystem is considered eutrophic to hypereutrophic, due to the high organic load [7,20,26]. In addition, contamination by metals such as Cr, Cu, Hg, Pb, and Zn in the northwestern region of the bay has been reported [2,20,27].…”

Section: Study Areamentioning

confidence: 99%

“…Guanabara Bay has been identified as one of the most polluted coastal environments in Brazil [19,20]. Since the 1950s, the degradation process has intensified, with the emergence of one of the largest industrial complexes in the watershed region.…”

Section: Introductionmentioning

confidence: 99%

“…The industrial complex comprises diverse industries, such as gas and oil, pharmaceuticals, and metallurgy. Furthermore, the bay surrounds the largest oil refinery in the country and the former Gramacho landfill, which was considered the largest in South America until 2012, when it was closed [2,20]. In addition, high urban growth in the state's metropolitan region has resulted in intense coastal contamination, especially by metals, which are one of the main by-products of industrialization.…”

Section: Introductionmentioning

confidence: 99%

“…In addition, high urban growth in the state's metropolitan region has resulted in intense coastal contamination, especially by metals, which are one of the main by-products of industrialization. In recent decades, several initiatives have been undertaken to characterize and provide a behavioral understanding of these contaminants in Guanabara Bay [2,[20][21][22].…”

Section: Introductionmentioning

confidence: 99%

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Bioavailability Assessment of Metals from the Coastal Sediments of Tropical Estuaries Based on Acid-Volatile Sulfide and Simultaneously Extracted Metals

Rodrigues,

Pereira,

Campos

et al. 2023

Coasts

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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.

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Section: Study Areamentioning

confidence: 99%

Section: Study Areamentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Bioavailability Assessment of Metals from the Coastal Sediments of Tropical Estuaries Based on Acid-Volatile Sulfide and Simultaneously Extracted Metals

Rodrigues,

Pereira,

Campos

et al. 2023

Coasts

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Land disposal of dredged sediments from an urbanized tropical lagoon: toxicity to soil fauna

Lourenço,

Cesar,

Koifman

et al. 2024

Ecotoxicology

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Mercury methylation upon coastal sediment resuspension: a worst-case approach under dark conditions

Monte

Rodrigues²,

Galvão³

et al. 2022

Environ Monit Assess

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Mercury behavior upon resuspension of sediments from two impacted areas of Guanabara Bay was evaluated to assess worst-case methylmercury (MeHg) responses, under dark experimental conditions. Total mercury (THg) and MeHg concentrations were determined along 24 hours experiments of sediment resuspension in the bay water. Fine-grained Meriti River estuary (MR) sediments had 8-times higher MeHg initial concentrations than sandy Rio the Janeiro Harbor (RJH) sediments (3.4 ± 0.29 vs. 0.41 ± 0.1 ng g − 1 , respectively).THg contents were uncorrelated with resuspension time, while correlations of resuspension time with MeHg (r 2 = 0.66) and %MeHg in relation to THg (r 2 = 0.75) were observed only for RJH sediments. These ndings correspond to a 2.8-times MeHg concentration increase (ΔMeHg = 0.75 ng g − 1 ) and 4.4-times increase in %MeHg (Δ%MeHg = 1.0%) for station RJH.This suggests that assessments of MeHg spatial-temporal variability can be limited if concentration changes due to sediment resuspension are not considered.

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Ecological risks associated to trace metals of contaminated sediments from a densely urbanized tropical eutrophic estuary

Cited by 8 publications

References 53 publications

Bioavailability Assessment of Metals from the Coastal Sediments of Tropical Estuaries Based on Acid-Volatile Sulfide and Simultaneously Extracted Metals

Bioavailability Assessment of Metals from the Coastal Sediments of Tropical Estuaries Based on Acid-Volatile Sulfide and Simultaneously Extracted Metals

Land disposal of dredged sediments from an urbanized tropical lagoon: toxicity to soil fauna

Mercury methylation upon coastal sediment resuspension: a worst-case approach under dark conditions

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