Mass balance in the monitoring of pollutants in tidal rivers of the Guanabara Bay, Rio de Janeiro, Brazil

Silveira, Raquel Pinhão da; Rodrigues, Ana Paula de Castro; Santelli, Ricardo Erthal; Cordeiro, Renato Campello; Bidone, Edison Dausacker

doi:10.1007/s10661-010-1821-9

Cited by 24 publications

(9 citation statements)

References 17 publications

(11 reference statements)

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“…Most part of the drainage area (total of 4,000km 2 ) presents high levels of pollutants released by domestic and industrial effluents (treated and untreated), from a 10 million population and around 10,000 industries (Pereira & Gomes, 2002). This results on a total discharge of domestic waste around 22.4 m 3 s -1 (Silveira et al, 2011), which represents 75% of the organic pollution volume for the bay (Pereira & Gomes, 2002). Its internal areas (northwest and west) are classified as eutrophic or hypereutrophic, due to the large input of domestic wastes (mainly untreated) (Ribeiro & Kjerfve, 2002).…”

Section: Study Areamentioning

confidence: 99%

“…Iguaçu River is an important contributor of organic loads to the bay. The superficial water has biochemical oxygen demand above 10 mg L -1 , reaching almost 20 mg L -1 at the river's mouth (Silveira et al, 2011). The Iguaçu River has 726 km 2 of drainage basin, with mean water flow of 20.0 m 3 s -1 during dry season, corresponding approximately 17% of the continental contribution to Guanabara Bay (JICA, 2003).…”

Section: Study Areamentioning

confidence: 99%

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Nutrient behavior in a highly-eutrophicated tropical estuarine system

Brandini¹,

Rodrigues²,

Abreu³

et al. 2016

Acta Limnol. Bras.

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Aim: There are few studies dealing with the biogeochemical processes occurring in small estuaries receiving high sewage loading in tropical regions. The aim of this investigation was to characterize the biogeochemical behavior of nutrients in superficial waters collected at the Iguaçu estuarine system, during specific conditions (neap tide), located at the inner sector of a heavily eutrophicated embayment (Guanabara Bay, SE Brazil). Methods Physical and chemical variables were measured in situ (pH, temperature, conductivity, salinity, total dissolved solids, transparency, dissolved oxygen), whereas suspended particulate matter, chlorophyll a, phaepigments and nutrients (carbon, nitrogen and phosphorus forms) were measured in laboratory across the mesohaline estuarine gradient. Results The Iguaçu River mouth is in a high stage of eutrophication, considering nutrient concentrations, chlorophyll a and transparency of water column. Results indicate a transition from heterotrophic conditions to autotrophic conditions, since the nutrients concentrations showed a decreasing pattern along the saline gradient, while the chlorophyll an increased over the transects. The pH values and chlorophyll : phaeopigments ratios are significantly related to the amount and quality of organic matter contents, especially at transects under strong marine influence. More than 95% of the dissolved and total nitrogen concentrations are represented by NH4+ contributions, which are related to the ammonification of organic matter contents in this region, indicating the existence of untreated sewage loads in this area. Conclusion In this study, the Iguaçu River seemed to contribute with high inputs of nutrients that support important phytoplankton production at the inner regions of the bay related to the CO2 sink and autotrophic metabolism, showing the importance of verifying the biogeochemical behaviors of nutrients in estuarine areas, even in small scale.

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Section: Study Areamentioning

confidence: 99%

Section: Study Areamentioning

confidence: 99%

Nutrient behavior in a highly-eutrophicated tropical estuarine system

Brandini¹,

Rodrigues²,

Abreu³

et al. 2016

Acta Limnol. Bras.

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“…The Cunha estuary has been impacted with silting processes and discharges of residues from industrial and domestic wastes over the last decades. Guanabara Bay basin is characterized by high concentrations of metals, petroleum hydrocarbons, and domestic wastes in sediments, water, and biota (Machado et al 2002;Bidone and Lacerda 2004;Silva et al 2007;Silveira et al 2010;Rodrigues et al 2011). The same amount of sediment was collected from three dredging points along the estuary and fractioned using nylon sieves (1.7 mm), to remove stones, roots, and other larger particles.…”

Section: Dredged Sediment Natural Soils and Test Mixturesmentioning

confidence: 99%

Disposal of dredged sediments in tropical soils: ecotoxicological effects on earthworms

César

Natal-da-Luz

Sousa

et al. 2013

Environ Monit Assess

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The upper limit concentrations of metals established by international legislations for dredged sediment disposal and soil quality do not take into consideration the properties of tropical soils (generally submitted to more intense weathering processes) on metal availability and ecotoxicity. Aiming to perform an evaluation on the suitability of these threshold values in tropical regions, the ecotoxicity of metal-contaminated dredged sediment from the Guanabara Bay (Rio de Janeiro, Brazil) was investigated. Acute and avoidance tests with Eisenia andrei were performed with mixtures

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“…The biggest oil refinery in Brazil is located at the mouth of Iguaçu River -the Duque de Caxias Refinery (REDUC). The Iguaçu-Sarapuí river system receives a significant load of non-treated domestic wastewater as well, due to absence of sanitation (Silveira et al, 2011).…”

Section: Introductionmentioning

confidence: 99%

Dredging impact on trace metal behavior in a polluted estuary: a discussion about sampling design

et al. 2019

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Dredging impact on trace metal behavior in a polluted estuary: a discussion about sampling design Studies involving coastal sediment resuspension have shown that trace metals could be released to the water column due to changes in physical-chemical conditions. Therefore, if environmental agencies adopt screening protocols with insufficient evaluations of contaminant mobilization risks for a given area, the prediction of environmental impacts caused by dredging may be limited. This work evaluates the influence of spatial variation on the geochemical mobility of trace metals (Cd, Cu, Ni, Pb, Zn) after artificial sediment resuspension, using as study case the Iguaçu River estuary (Guanabara Bay, Brazil). The Iguaçu River drains the industrial complex of the metropolitan area of Rio de Janeiro State, besides the presence of agriculture and the input of untreated domestic wastes. Surface estuarine sediments were submitted to resuspension experiments in an open system, during 1h and 24h of agitation on local water. A clear tendency of metals' solubilization was observed after resuspension, especially considering the dissolved concentrations of Cu (average: 8.0 µg L-1) and Zn (average: 0.9 mg L-1), especially for the samples from the transects 2 and 3. However, evaluations of water quality changes due to sediment resuspension are not requested by the legislation regulating the dredging activities. In the sediments, the results suggested a higher geochemical mobility of Cu, indicated by the massive increase on the bioavailable fraction after resuspension, mainly on the transect number 3, on the river's mouth. The effects of resuspension were distinct between samples, suggesting that even in a small scale, important differences on metals' mobility are found. Thus, the combined assessment of changes in metal concentrations in water and in the metal partitioning linked to the solid-phase was demonstrated to be a promising tool for predicting the environmental risks of dredging due to changes in the bioavailability of metals.

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Mass balance in the monitoring of pollutants in tidal rivers of the Guanabara Bay, Rio de Janeiro, Brazil

Cited by 24 publications

References 17 publications

Nutrient behavior in a highly-eutrophicated tropical estuarine system

Nutrient behavior in a highly-eutrophicated tropical estuarine system

Disposal of dredged sediments in tropical soils: ecotoxicological effects on earthworms

Dredging impact on trace metal behavior in a polluted estuary: a discussion about sampling design

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