Nutrient flux and budget in Patos Lagoon estuary

Niencheski, Luís Felipe Hax; Windom, Herbert L.

doi:10.1016/0048-9697(94)90004-3

Cited by 55 publications

(38 citation statements)

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“…In Patos lagoon estuary, nutrients supplied by the freshwater supply were rapidly removed in the oligohaline region (Niencheski et al, 1986;Niencheski and Windom, 1994;Windom et al, 1999), which could cause localized toxic algae blooms. Therefore, the region near the outlet of Vieira creek might be at a high risk of eutrophication.…”

Section: Outputs To Patos Lagoon Estuarymentioning

confidence: 99%

“…The main causes of such contamination are the use of fertilizers in the agricultural activities (Santos et al, 2004) and the discharge of untreated urban sewage (Baumgarten et al, 1998;Baumgarten et al, 1995;Niencheski and Windom, 1994). Therefore, the implementation of sewage treatment processes has been considered a key solution to avoid eutrophication.…”

Section: Introductionmentioning

confidence: 99%

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Influence of effluents from a Wastewater Treatment Plant on nutrient distribution in a coastal creek from southern Brazil

Santos

Costa

Freitas

et al. 2008

Braz. arch. biol. technol.

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Section: Outputs To Patos Lagoon Estuarymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Influence of effluents from a Wastewater Treatment Plant on nutrient distribution in a coastal creek from southern Brazil

Santos

Costa

Freitas

et al. 2008

Braz. arch. biol. technol.

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“…Because of its shallow depth and low tidal range (0.47 m), the water of the Patos Lagoon is vertically well mixed. 23 Rio Grande city has an industrial park, where the main activity is chemical processes associated with fertilizer, oil and petrochemical industries, which have a high potential for pollution. Untreated sewage is another source of contamination.…”

Section: Study Sitesmentioning

confidence: 99%

In situ measurement of trace metals in estuarine waters of Patos Lagoon using diffusive gradients in thin films (DGT)

Wallner-Kersanach

Andrade

Zhang

et al. 2009

J. Braz. Chem. Soc.

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A técnica de gradiente difusivo de membrana (DGT) foi utilizada para determinar metais lábeis in situ durante diferentes condições hidrológicas no estuário da Lagoa dos Patos. As amostras de água foram também analisadas para a fração lábil-Chelex para Cd, Co, Cu, Mn, Ni e Zn usando resina Chelex-100. As concentrações lábeis-DGT de Cd, Cu, Ni e Zn foram mais baixas que a lábil-Chelex, possivelmente devido à ligação do metal coloidal na coluna de resina Chelex. Os resultados do DGT indicaram um decréscimo nas concentrações de todos os elementos, refletindo trocas na especiação dos metais em solução causada pela diminuição da salinidade e associado a mudanças de pH no estuário. Os resultados demonstraram a sensibilidade do DGT para a especiação dos metais e a capacidade do uso da técnica DGT em águas estuarinas altamente dinâmicas para a obtenção de concentrações de metais lábeis integradas ao longo do tempo.The diffusive gradients in thin-films (DGT) technique was used to determine labile metals in situ during different hydrological conditions in the Patos Lagoon estuary. Water samples were also analyzed for Chelex-labile fractions of Cd, Co, Cu, Mn, Ni and Zn using Chelex-100 resin. DGT-labile concentrations of Cd, Cu, Ni and Zn were lower than Chelex-labile concentrations, possibly because colloids were trapped in the Chelex resin column. There was a decrease with increasing deployment time in the concentrations of all elements measured by DGT, reflecting changes in metal speciation in solution caused by the decrease in the salinity and associated with change in pH in the estuary. The results demonstrated the sensitivity of DGT to metal speciation and the feasibility of using the DGT technique in highly dynamic estuarine waters to obtain a time-integrated record of labile trace metals. Keywords: DGT, labile metal, estuary IntroductionTrace metals are one of the major contaminants of estuarine and coastal areas, as a result of coastal development and, consequently, inputs from many anthropogenic sources. 1 Elements such as Cu, Ni, Mn and Zn play an important role as essential elements in aquatic systems. However, elevated concentrations of these elements, and of nonessential elements such as Cd, may cause toxicity for aquatic organisms. The investigation of metal bioavailability in water is as important as metal concentration when considering the impact of metals on an environment.The free metal ion (M 2+ ) and labile metal species in solution are the forms of dissolved metal often accumulated by aquatic organisms. 2 Uptake may occur directly into phytoplankton cells 3 or across gill membranes in fish. 4 So, speciation studies of trace metals have become important, as it enables evaluation of trace metal bioavailability and mobility. Available techniques include anodic stripping voltammetry, 5 cathodic stripping voltammetry 6 and ionexchange columns. 7 However, with standard equipment, all these methods require analyses to be done on a sample brought to the laboratory and metal speciation may change in this time ...

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“…10, 2016 addressed qualitative aspects, whereas a quantitative approach including, for instance, the influence of material transferred along the estuarine gradient is less frequently observed. [21][22][23] Selman et al 24 provide strong evidences of the growing global impact of eutrophication, identifying 415 eutrophic and hypoxic coastal systems around the globe, including the coastal region of Rio de Janeiro and other areas in the south-southeastern coast of Brazil.…”

Section: Introductionmentioning

confidence: 99%

Estuary Adjacent to a Megalopolis as Potential Disrupter of Carbon and Nutrient Budgets in the Coastal Ocean

Lazzari¹,

Wagener²,

Farias³

et al. 2016

Journal of the Brazilian Chemical Society

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The goals were to estimate nutrients and carbon flow rates between Guanabara Bay and the adjacent coastal waters, to characterize the provenance of the exported/imported organic matter. Samples were collected from different depths over 25 h in two seasons at the bay entrance. Measurements included physicochemical parameters, nutrients, chlorophylls, dissolved organic carbon (DOC), particulate organic carbon (POC), particulate nitrogen (PN), carbon (d 13 C) and nitrogen (d 15 N) isotopic composition, sterols in suspended particulate matter (SPM) and bacterioplankton. Most variables showed higher values in ebb tide events. The flow rates calculated on daily basis and estimated on annual basis revealed the exportation to the continental shelf of 1.27 × 10 4 kmol year -1 dissolved inorganic nitrogen (DIN), 9.52 × 10 2 kmol year -1 dissolved inorganic phosphorus (DIP), 2.65 × 10 4 t year -1 DOC, 1.96 × 10 4 t year -1 POC, and 2.96 × 10 4 t year -1 PN. The estimates show the bay contributes with 0.01% of the total global carbon influx to the ocean.

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Nutrient flux and budget in Patos Lagoon estuary

Cited by 55 publications

References 1 publication

Influence of effluents from a Wastewater Treatment Plant on nutrient distribution in a coastal creek from southern Brazil

Influence of effluents from a Wastewater Treatment Plant on nutrient distribution in a coastal creek from southern Brazil

In situ measurement of trace metals in estuarine waters of Patos Lagoon using diffusive gradients in thin films (DGT)

Estuary Adjacent to a Megalopolis as Potential Disrupter of Carbon and Nutrient Budgets in the Coastal Ocean

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