Screening-level risk assessment applied to dredging of polluted sediments from Guanabara Bay, Rio de Janeiro, Brazil

Silveira, Ana Elisa Fonseca; Nascimento, Juliana Ribeiro; Sabadini-Santos, Elisamara; Bidone, Edison Dausacker

doi:10.1016/j.marpolbul.2017.03.016

Cited by 33 publications

(10 citation statements)

References 30 publications

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“…The Rio de Janeiro seaport is the major local domestic and international cargo tourist and people transportation route by the sea. Thus, it is intensely contaminated and displays high sedimentation rates, which leads to decreased local depths and vessel berthing problems [11,13].…”

Section: Study Areamentioning

confidence: 99%

“…Thus, this increase in oxygenation may be precisely related to an event that improved the water flow, promoting better oxygenation in the region and removal of sediments (for example sea currents and wind energy), boosting and improving the speed of the water flow of collection in 2017, which was not repeated in 2018, in relation to oxygenation. In addition, the dredging itself can be influenced in improving this factor, since all points showed an increase in oxygen concentration [11], even if subtle.…”

Section: Abiotic Variablesmentioning

confidence: 99%

“…The dredged sediment was removed from this area and released into the oceanic region adjacent to the bay. This aimed to minimize problems associated with contaminant accumulation, increasing vessel access channel depth, improving water circulation and coastal water renewal, promoting macrodrainage for the disposal of surface waters, consequently improve water oxygenation and improving operating hydraulic work conditions, and controlling critical hydrological events [11]. Thus, dredging may in fact worsen Hg contamination by making this element bioavailable in its most toxic form.…”

Section: Introductionmentioning

confidence: 99%

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Dredging Activities Carried Out in a Brazilian Estuary Affect Mercury Levels in Swimming Crabs

Rodrigues

Ferrari

Hauser‐Davis

et al. 2020

IJERPH

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(1) Although suffers from intense pollution inputs, Guanabara Bay, the most socioeconomically and environmentally important estuary in Rio de Janeiro, Brazil, is still home to a diverse fauna, including several fish and crab species consumed by humans. The bay presents high sedimentation rates and sediment contamination, further aggravated by dredging processes carried out in recent years. In this context, this study aimed to verify the effect of the dredging process on total mercury (THg) concentrations at Guanabara Bay through swimming crab assessments sampled before (2016), during (2017), and after (2018) the dredging process, and mainly, if the detected concentrations can be harmful to consumer health; (2) Methods: Swimming crab samplings were carried out at the same time and sampling points in 2016, 2017 and 2018 and the total Hg was determined using a Direct Mercury Analyzer (DMA-80, Milestone, Bergamo, Italy); (3) Results: Increased Hg concentrations were observed during the dredging process, decreasing to lower values, close to the initial concentrations, at the end of the process. Some of the investigated abiotic factors favor Hg dynamics in the aquatic environment, while others were positively altered at some of the assessed sampling areas at the end of the dredging process; (4) Conclusions: Although crab Hg levels were below maximum permissible limits for human consumption, it is important to note that these animals are significantly consumed around Guanabara Bay, which may lead to public health issues in the long term.

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Section: Study Areamentioning

confidence: 99%

Section: Abiotic Variablesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Dredging Activities Carried Out in a Brazilian Estuary Affect Mercury Levels in Swimming Crabs

Rodrigues

Ferrari

Hauser‐Davis

et al. 2020

IJERPH

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“…Metais, hidrocarbonetos de petróleo, fármacos, hormônios, agroquímicos, dentre outras substâncias tóxicas, comumente ocorrem em amostras de água e de sedimentos destes ambientes (Stumpf et al, 1999;Stefens et al, 2007). Dentre as alternativas de remediação de assoreamento dos sistemas costeiros, a dragagem dos sedimentos de fundo é comum no Brasil, e tem sido realizada visando o aumento da circulação de águas e a redução do risco ecológico associado a contaminações (Cesar et al, 2014;Silveira et al, 2017). Além disso, a dragagem é fundamental à viabilização de atividades de navegação (sobretudo em zonas portuárias), prática de esportes aquáticos e de pesca segura para consumo humano.…”

Section: Influência Da Salinidade Na Toxicidade De Sedimentos Dragadounclassified

“…Além disso, a dragagem é fundamental à viabilização de atividades de navegação (sobretudo em zonas portuárias), prática de esportes aquáticos e de pesca segura para consumo humano. No caso do Estado do Rio de Janeiro, há necessidade de dragagem de setores diversos da Baía de Guanabara, Baía de Sepetiba, sistemas fluviais e lagunares de Jacarepaguá e da Barra da Tijuca, canais fluviais da baixada fluminense, Lagoa Rodrigo de Freitas e sistemas lagunares da Região dos Lagos (Almeida et al, 2001;Loureiro et al, 2009;Cesar et al, 2014;Silveira et al, 2017) A disposição terrestre destes sedimentos dragados é relativamente comum no Estado do Rio de Janeiro (Almeida et al, 2001;Cesar et al, 2014;Silveira et al, 2017). Diversos autores sugerem que metais e outras substâncias tóxicas têm potencial de causar efeitos nocivos à saúde da fauna edáfica (Neuhauser et al, 1985;Sivakumar, 2015).…”

Section: Influência Da Salinidade Na Toxicidade De Sedimentos Dragadounclassified

Influence of Salinity on the Toxicity of Dredged Sediments from Estuarine Rodrigo de Freitas Lagoon and Guanabara Bay (RJ): Toxic Effects On Earthworms

et al. 2019

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ResumoA influência da salinidade na ecotoxicidade de sedimentos dragados de sistemas estuarinos, em cenário de disposição terrestre, foi estudada utilizando Eisenia andrei como bioindicador. Foram coletadas amostras de Latossolo e de Chernossolo e salinizadas com água do mar para realização de bioensaios agudo e de fuga. Dados de salinidade e CL 50 de sedimento (Lagoa Rodrigo de Freitas e Baía de Guanabara) foram compiladas da literatura, oriundos de bioensaios agudo com E. andrei. Quando a concentração de sal na mistura solo: sedimento é próxima à CL 50 de sal obtida experimentalmente com água do mar, considerou-se que o sal tem papel preponderante na toxicidade. As concentrações de sal ≥ 3 g/kg são significativamente letais aos organismos em ambos os tipos de solo. Respostas significativas de fuga foram constatadas a partir da dosagem de 2 g/kg. Os resultados indicam que para os sedimentos da APA de Guapimirim (inverno), Lagoa Rodrigo de Freitas (em Chernossolo), Porto do Rio (inverno), Porto de Niterói (verão) e foz do Rio Meriti (inverno), o sal marinho tem papel de suma relevância na toxicidade para as minhocas. Para as demais áreas estudadas, outros fatores, como as propriedades do sedimento, metais pesados e substâncias orgânicas, parecem desempenhar papel mais importante na toxicidade. AbstractThe role of salinity levels in the toxicity of dredged sediments from estuarine systems, in scenario of land disposal, was investigated by using Eisenia andrei as bioindicator. Samples of ferralsol and chernosol were collected and salinized with seawater (2 and 12 g/kg of salt) and submitted to acute and avoidance bioassays with E. andrei. Data of salinity and sediment LC 50 were extracted from the literature. These data consists of results from acute bioassays with E. andrei applied to dredged sediments from Rodrigo de Freitas Lagoon and Guanabara Bay. The concentration of salt (g/kg) in soil:sediment mixture that corresponded to the LC 50 was estimated by determining salt contents in pure soils and sediments. When such concentration is close to the LC 50 obtained in laboratory using seawater, the influence of the salt in the toxicity was considered preponderant. The results revealed that concentrations of salt ≥ 3g/kg are significantly lethal to the organisms in both soil types, but toxicity levels are higher in ferralsol (LC 50 = 3,51 g/kg) than those observed in chernosol (LC 50 = 4,03 g/kg). Concentrations of salt ≥ 2g/kg were able to cause significant avoidance responses, but again the value of EC 50 in ferralsol (2,77 g/kg) were lower than that obtained in chernosol (2,99 g/kg). These observations are due to the abundance of expansive clay minerals in chernosol, with high cationic exchange capacity and that are able to reduce toxicity levels. The sediments whose salt concentrations in the sediment LC 50 (soil:sediment mixture) are close to the salt LC 50 values determined in laboratory are the APA of Guapimirim (winter), Porto of Rio (winter), Port of Niterói (summer), Rodrigo de Freitas Lagoon (in chernosol)...

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Microbial community activity in response to multiple contaminant exposure: a feasible tool for sediment quality assessment

Nascimento

Silveira

Bidone

et al. 2019

Environ Monit Assess

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Screening-level risk assessment applied to dredging of polluted sediments from Guanabara Bay, Rio de Janeiro, Brazil

Cited by 33 publications

References 30 publications

Dredging Activities Carried Out in a Brazilian Estuary Affect Mercury Levels in Swimming Crabs

Dredging Activities Carried Out in a Brazilian Estuary Affect Mercury Levels in Swimming Crabs

Influence of Salinity on the Toxicity of Dredged Sediments from Estuarine Rodrigo de Freitas Lagoon and Guanabara Bay (RJ): Toxic Effects On Earthworms

Microbial community activity in response to multiple contaminant exposure: a feasible tool for sediment quality assessment

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