Organic-copper interactions in Guanabara Bay, Brazil. An electrochemical study of copper complexation by dissolved organic material in a tropical bay

Berg, Constant M.G. van den; Rebello, Angela de Luca

doi:10.1016/0048-9697(86)90073-2

Cited by 31 publications

(13 citation statements)

References 13 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…For instance at the higher salinity end of the estuary of the river Scheldt the concentration of L1 was 12.9 nM with a complex stability of log K 0 CuL1 = 14.8 (Laglera and van den Berg, 2003); the concentration of L2 in that water was 35 nM with a value for log K 0 CuL2 of 13.2. Guanabara Bay, a shallow lagoon adjacent to Rio de Janeiro, had copper complexing ligands at greater concentrations of 40-300 nM and log K 0 CuL values of 9.6 to 12.4 (Van Den Berg and De Luca Rebello, 1986). These results are directly comparable as they had been determined at a similar detection window but using a different ligand (catechol) as competing ligand.…”

Section: Organic Copper Complexing Ligandssupporting

confidence: 74%

Benthic fluxes of copper, complexing ligands and thiol compounds in shallow lagoon waters

Chapman

Capodaglio

Turetta

et al. 2009

Marine Environmental Research

View full text Add to dashboard Cite

a b s t r a c tBenthic fluxes of copper, copper complexing ligands and thiol compounds in the shallow waters of Venice Lagoon (Italy) were determined using benthic chambers and compared to porewater concentrations to confirm their origin. Benthic copper fluxes were small due to small concentration differences between the porewaters and the overlying water, and the equilibrium concentration was the same at both sites, suggesting that the sediments acted to buffer the copper concentration. Thiol fluxes were $10 Â greater at 50-60 pmol cm À2 h À1, at the two sites. Porewater measurements demonstrated that the sediments were an important source of the thiols to the overlying waters. The overlying waters were found to contain at least two ligands, a strong one, L1 (log K 0 CuL1 = 14.2) and a weaker one, L2 (log K 0 CuL2 = 12.5). The concentration of L1 remained relatively constant during the incubation and similar to that of copper, whereas that of L2 was in great excess of copper, its concentration balanced by porewater releases and breakdown, probably due to uptake by microorganisms, similar to that of the thiol compounds. Similarity of the thiol and L2 concentrations and similar complex stability with copper suggest that L2 was dominated by the thiols. The free copper concentration ([Cú ]) in the Lagoon waters was lowered by a factor of 10 5 as a result of the organic complexation.

show abstract

Section: Organic Copper Complexing Ligandssupporting

confidence: 74%

Benthic fluxes of copper, complexing ligands and thiol compounds in shallow lagoon waters

Chapman

Capodaglio

Turetta

et al. 2009

Marine Environmental Research

View full text Add to dashboard Cite

show abstract

“…Comparing these data with the pattern of diversity from other areas in Guanabara Bay, they are similar to data found in other restricted regions, such as the north of the Bay (Vilela et al 2002), which is considered one of the most polluted areas, close to the main oil refineries in Rio de Janeiro , Vandenberg and Rebello 1986, Leal and Wagener 1993.…”

Section: Benthic Foraminifera Analysessupporting

confidence: 71%

Benthic foraminifera distribution in high polluted sediments from Niterói Harbor (Guanabara Bay), Rio de Janeiro, Brazil

Vilela

Batista

Batista-Neto

et al. 2004

An. Acad. Bras. Ciênc.

View full text Add to dashboard Cite

Dockyards and harbors are recognized as being important locations where sediment-associated pollutants can accumulate, which constitutes an environmental risk to aquatic life due to potential uptake and accumulation of heavy metals in the biota. The aim of this paper is to assess the concentrations and the effects of some heavy metals in the benthic foraminifera assemblage in Niterói Harbor. Low concentrations in the benthic foraminifera as well as the dominance of indicative species such as Ammonia tepida, Buliminella elegantissima and Bolivina lowmani can be associated with an environment under stress. In addition, the occurrence of test abnormalities among foraminifera may represent a useful biomarker for evaluating long-term environmental impacts in a coastal region.

show abstract

“…1), is considered to be one of the most polluted environments on the Brazilian coastline, where the main direct sources originate from domestic and industrial effluents , Vandenberg and Rebello 1986, Leal and Wagener 1993, Baptista Neto et al 2000. However, there is a lack of information concerning indirect sources of pollution such as the urban street sediments and to study this premise geochemical and particle size analyses was carried out on sediments collected from highways located in the littoral of Guanabara Bay.…”

mentioning

confidence: 99%

The contribution of heavy metal pollution derived from highway runoff to Guanabara Bay sediments: Rio de Janeiro / Brazil

Pereira

Baptista-Neto

Smith

et al. 2007

An. Acad. Bras. Ciênc.

View full text Add to dashboard Cite

In this study, geochemical and particle size analyses of thirty-four street sediment samples collected from an urban environment around Guanabara Bay, shows highway run-off to be a potential source of heavy metals for the pollution of near-shore sedimentary deposits. Concentrations of Fe, Mn, Zn, Cu, Pb, Cr and Ni were found to be higher in these sediments when compared to concentrations found in samples from the natural environment, where an Enrichment Factor (EF) index was used to distinguish between natural and anthropogenic sources. Particle size analysis shows these sediments to be predominantly composed of sand and no distribution pattern was observed between the sand, silt and clay fractions. High levels of organic matter and heavy metals would indicate that these street run-off materials are a potential source of pollution for the near-shore sediments of Guanabara Bay.

show abstract

Organic-copper interactions in Guanabara Bay, Brazil. An electrochemical study of copper complexation by dissolved organic material in a tropical bay

Cited by 31 publications

References 13 publications

Benthic fluxes of copper, complexing ligands and thiol compounds in shallow lagoon waters

Benthic fluxes of copper, complexing ligands and thiol compounds in shallow lagoon waters

Benthic foraminifera distribution in high polluted sediments from Niterói Harbor (Guanabara Bay), Rio de Janeiro, Brazil

The contribution of heavy metal pollution derived from highway runoff to Guanabara Bay sediments: Rio de Janeiro / Brazil

Contact Info

Product

Resources

About