Heavy metal distribution, availability and fate in Sepetiba Bay, S.E. Brazil

Lacerda, Luiz Drude de; Pfeiffer, Wolfgang C.; Fiszman, M.

doi:10.1016/0048-9697(87)90169-0

Cited by 116 publications

(70 citation statements)

References 10 publications

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“…[29][30][31][32][33] Industries established in 1966, produced Zn ingots, until the end of the 1990's. During this time, this industry released significant quantities of Zn and Cd as evidenced in the sediment surrounding the area ( Table 2).…”

Section: Marambaia Soundmentioning

confidence: 99%

A historical evaluation of anthropogenic impact in coastal ecosystems by geochemical signatures

Patchineelam¹,

Sanders²,

Smoak³

et al. 2011

J. Braz. Chem. Soc.

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Section: Marambaia Soundmentioning

confidence: 99%

A historical evaluation of anthropogenic impact in coastal ecosystems by geochemical signatures

Patchineelam¹,

Sanders²,

Smoak³

et al. 2011

J. Braz. Chem. Soc.

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Section: Site Descriptionmentioning

confidence: 99%

“…6, 2007 smelters. 30,33,34 Sepetiba Basin harbors an industrial park with over 400 industries, a population of about 1.2 million and important fisheries and tourist activities.…”

Section: Site Descriptionmentioning

confidence: 99%

“…Once reaching the bay, Hg, as well as other trace metals associated with suspended particulate matter and transported by rivers, are distributed following tidal currents within the bay. 33,37,49 Sample collection Four field campaigns (F 1 , F 2 , F 3 and F 4 ) were conducted in the water column at the mouth of Sepetiba Bay, in a fixed point at the main canal of the Bay, during the flood and ebb periods and in the dry and wet seasons ( Figure 1). In each campaign, vertical profiles in the water column were sampled hourly during a half tidal cycle in three different depths: surface, mid water and bottom with water depths of 1, 6 and 12 meters, respectively.…”

Section: Site Descriptionmentioning

confidence: 99%

“…6, 2007 smelters. 30,33,34 Sepetiba Basin harbors an industrial park with over 400 industries, a population of about 1.2 million and important fisheries and tourist activities.The water circulation in the bay is dominated by the winds and tides. Dominant regional winds (SW 25°) add seawater from the Atlantic Ocean through the western channel, creating a clockwise current pattern, which drives freshwater and fluvial sediments to Guaratiba region and keeps water salinity around 30.…”

mentioning

confidence: 99%

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Mercury speciation changes in waters of the sepetiba Bay, SE Brazil during tidal events and different seasons

Paraquetti¹,

Lacerda²,

Almeida³

et al. 2007

J. Braz. Chem. Soc.

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Este estudo descreve as mudanças na especiação de Hg nas águas da Baía de Sepetiba, SE, Brasil, ao longo do gradiente estuarino, durante eventos de maré em diferentes estações. A avaliação química das águas da baía indicou uma exportação de material particulado em suspensão (MPS) pobre em carbono orgânico para a plataforma continental adjacente, principalmente durante a estação chuvosa e uma importação de MPS oceânico rico em carbono orgânico, provavelmente de origem fitoplanctônica, durante a estação seca. A especiação química do Hg demonstrou que a produção de Hg 0 na Baía de Sepetiba pode ser controlada pela produtividade primária, e que a baía atua como produtora e exportadora de formas orgânicas de Hg para as áreas adjacentes, já que as maiores concentrações de Hg não-reativo foram encontradas durante a maré vazante. Não foram observadas correlações significantes entre as concentrações de Hg não-reativo e carbono orgânico dissolvido ou particulado. Em geral, as frações de Hg particulado, Hg não-reativo e Hg reativo representam 55%, 35% e 9,5% do conteúdo total de Hg nas águas da Baía de Sepetiba, respectivamente.This work describes changes in Hg speciation in water along the transport from Sepetiba Bay, SE Brazil, to the adjacent continental platform during tide events and in different seasons. The chemical evaluation of Sepetiba Bay waters showed that the bay exports suspended particulate material (SPM) impoverish in organic carbon to adjacent continental platform areas, mainly during the wet season and imports SPM enriched in organic carbon from the ocean, probably of phytoplanktonic origin, during the dry season. The chemical speciation of Hg during the study period showed that Hg 0 production can be controlled by primary productivity and that the bay acts as a producer and exporter of organic species of Hg to adjacent areas, since the highest non-reactive Hg concentrations were observed during the ebb tide. No significant correlations were found between non-reactive Hg and dissolved or particulate organic matter concentrations. In general the particulate Hg, non-reactive Hg and reactive Hg fractions represents 55%, 35.5% and 9.5% of the total Hg content in Sepetiba Bay waters, respectively.Keywords: mercury speciation, coastal area, organic carbon, Sepetiba Bay IntroductionCoastal environments are complex and very dynamic systems showing a strong salinity gradient, high variation of suspended matter concentration and complex hydrodynamic processes. They act as links between the terrestrial and oceanic environments, present a large capacity to accumulate materials of continental and marine origin and are strongly affected by tidal events and continental hydrology. These environments are also characterized by land-sea gradients of physicochemical processes such as oxidation/reduction, sorption/desorption and precipitation/dissolution, which result in gradients of dissolved chemical species concentration, ionic force, pH and redox potential, which are responsible for the precipitation of the major part of ...

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Occurrence of methylated tin and dimethyl mercury compounds in a mangrove core from Sepetiba Bay, Brazil

Quevauviller

Donard

Wasserman

et al. 1992

Applied Organom Chemis

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Analyses of organotin and organic mercury compounds have been performed in a sediment core from Sepetiba Bay, Brazil, in order to investigate possible methylation pathways in a mangrove environment. The results have revealed that the physico-chemical conditions existing in this type of environment (high organic inputs, anaerobic conditions, microbial activity, etc.) account for high methyltin concentrations (mono-, di-and trimethyltin) in the sediments, which are dependent upon the total load of metal released (e.g. from anthropogenic sources). Furthermore, the presence of dimethylmercury and not monomethylmercury in the samples demonstrated a new pathway of transformation of mercury in the environment: this compound, thought to be unstable in sediment, is assumed to be stabilized by a conjunction of factors, such as high sulphide levels, anoxic conditions and constant inputs of methane into the medium.

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Heavy metal distribution, availability and fate in Sepetiba Bay, S.E. Brazil

Cited by 116 publications

References 10 publications

A historical evaluation of anthropogenic impact in coastal ecosystems by geochemical signatures

A historical evaluation of anthropogenic impact in coastal ecosystems by geochemical signatures

Mercury speciation changes in waters of the sepetiba Bay, SE Brazil during tidal events and different seasons

Occurrence of methylated tin and dimethyl mercury compounds in a mangrove core from Sepetiba Bay, Brazil

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