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Ecological risk assessment of metal and hydrocarbon pollution in sediments from an urban tropical estuary: Tijuca lagoon (Rio de Janeiro, Brazil)

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Abstract

Urban tropical lagoons are often impacted by eutrophication, metal, and polycyclic aromatic hydrocarbon (PAH) contamination, but the toxicity of their bottom sediments is still poorly investigated in South America. Aiming to contribute to filling this gap, a sediment quality assessment was conducted in the Tijuca Lagoon (Rio de Janeiro, Brazil) using different lines of evidence (LOEs) including sediment characterization, determination of metals and PAHs, and acute toxicity testing with burrowing amphipods (Tiburonella viscana). Mud and organic matter contents played a crucial role in contaminant distribution along the lagoon. The concentrations of PAH were generally low (mean ΣPAH = 795.42 ± 1146.2 ng/g; n = 23), but a contamination hotspot of light PAH compounds was identified. Such PAHs were mainly pyrolytic, probably related to the deposition of atmospheric pollution, although petrogenic compounds also occur in the lagoon. The data indicated the occurrence of geochemical anomalies of Zn, Cu, Pb, and Hg (mean values = 176.9 ± 91.6, 45.1 ± 21.3, 35.2 ± 15.0, 0.1442 ± 0.0893 mg/kg, respectively; n = 23), probably associated with industrial wastes, garbage deposition, urban runoff, and domestic sewage contributions. The mortality of T. viscana was significant for more than 85% of the samples (mean mortality = 70.3 ± 26.0%; n = 23), but it was not significantly correlated with PAH and metal concentrations. On the other side, domestic sewage contributions and eutrophication seem to play a relevant role in sediment toxicity. Actually, the toxicity observed in the tests seems to be due to the simultaneous influence of multiple toxicants and their combined effects on the organisms. Such stressors may include not only metals, PAH, and eutrophication but also chemicals not evaluated in this study, such as hormones, pharmaceuticals and personal care compounds, perfluorocompounds, detergents, and others.

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Acknowledgements

We are grateful to the geographer Danielle Soares and the boatman “Katatau” for their support during the sampling campaign.

Funding

The CNPq (National Brazilian Council for Scientific and Technological Development) and CAPES (Coordination for the Improvement of Higher Level -or Education- Personnel) Institutions provided grants to Matheus Teixeira (Master-CAPES), Rodrigo Lourenço (IC-CNPq), Yan Ribeiro (IC-CNPq), and Gustavo Koifman (IC-CNPq). The first author Matheus Teixeira was supported by a grant from CAPES (Brazilian Education Ministry—Grant number: 88887.481217/2020–00). Denis Abessa (grant #308533/2018–6) and Fernando Cesar Perina (grant CAPES #88887.124100/2016–00) were funded by CNPq and CAPES, respectively. FCT/MCTES provided financial support to CESAM (UIDP/50017/2020 + UIDB/50017/2020 + LA/P/0094/2020).

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All authors contributed to the study conception and design. The sampling of sediments (field work), material preparation,n and data collection were performed by Matheus Teixeira, Rodrigo Lourenço, Yan Ribeiro, and Gustavo Koifman. Metal determination and its interpretation were performed by Zuleica Castilhos, Matheus Teixeira, Ricardo Cesar, and Denis Abessa. Hydrocarbon determination and its interpretation were performed by Celeste Siqueira, Matheus Teixeira, and Ricardo Cesar. The ecotoxicological test was performed by Denis Abessa, Fernando Cesar Perina, and Matheus Teixeira. Physical and chemical properties of the sediments were determined and interpreted by Matheus Teixeira, Rodrigo Lourenço, Mariana Vezzone, Roberto Meigikos dos Anjos, and Helena Polivanov. Finally, the statistical treatment was performed by Mariana Vezzone, Denis Abessa, and Matheus Teixeira. The first draft of the manuscript was written by Matheus Teixeira and Ricardo Cesar, and all authors commented on previous versions of the manuscript. All authors read and approved the final manuscript.

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Correspondence to Matheus Teixeira.

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This research involved the use of marine amphipods as test-organisms in laboratorial ecotoxicological tests. We guarantee the welfare of the animals used in this study.

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Teixeira, M., Cesar, R., Abessa, D. et al. Ecological risk assessment of metal and hydrocarbon pollution in sediments from an urban tropical estuary: Tijuca lagoon (Rio de Janeiro, Brazil). Environ Sci Pollut Res 30, 184–200 (2023). https://doi.org/10.1007/s11356-022-22214-6

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