Dredging impact on trace metal behavior in a polluted estuary: a discussion about sampling design
Main Author: | |
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Publication Date: | 2019 |
Other Authors: | , , , , , |
Format: | Article |
Language: | eng |
Source: | Brazilian Journal of Oceanography |
Download full: | https://www.revistas.usp.br/bjoce/article/view/161574 |
Summary: | 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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Brazilian Journal of Oceanography |
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Dredging impact on trace metal behavior in a polluted estuary: a discussion about sampling designBioavailabilityresuspensionGuanabara Bayremobilizationtrace metalsStudies 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.Universidade de São Paulo. Instituto Oceanográfico2019-06-06info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionapplication/pdfhttps://www.revistas.usp.br/bjoce/article/view/16157410.1590/s1679-87592019022706701Brazilian Journal of Oceanography; Vol. 67 (2019); e19227Brazilian Journal of Oceanography; v. 67 (2019); e19227Brazilian Journal of Oceanography; Vol. 67 (2019); e192271982-436X1679-8759reponame:Brazilian Journal of Oceanographyinstname:Universidade de São Paulo (USP)instacron:USPenghttps://www.revistas.usp.br/bjoce/article/view/161574/155528Monte, Christiane do NascimentoRodrigues, Ana Paula de CastroFreitas, Alexandre Rafael deFreire, Aline SoaresSantelli, Ricardo ErthalBraz, Bernardo FerreiraMachado, Wilsoninfo:eu-repo/semantics/openAccess2020-12-04T18:11:28Zoai:revistas.usp.br:article/161574Revistahttps://www.revistas.usp.br/bjoce/indexPUBhttps://www.revistas.usp.br/bjoce/oaiio@usp.br||io@usp.br1982-436X1679-8759opendoar:2020-12-04T18:11:28Brazilian Journal of Oceanography - Universidade de São Paulo (USP)false |
dc.title.none.fl_str_mv |
Dredging impact on trace metal behavior in a polluted estuary: a discussion about sampling design |
title |
Dredging impact on trace metal behavior in a polluted estuary: a discussion about sampling design |
spellingShingle |
Dredging impact on trace metal behavior in a polluted estuary: a discussion about sampling design Monte, Christiane do Nascimento Bioavailability resuspension Guanabara Bay remobilization trace metals |
title_short |
Dredging impact on trace metal behavior in a polluted estuary: a discussion about sampling design |
title_full |
Dredging impact on trace metal behavior in a polluted estuary: a discussion about sampling design |
title_fullStr |
Dredging impact on trace metal behavior in a polluted estuary: a discussion about sampling design |
title_full_unstemmed |
Dredging impact on trace metal behavior in a polluted estuary: a discussion about sampling design |
title_sort |
Dredging impact on trace metal behavior in a polluted estuary: a discussion about sampling design |
author |
Monte, Christiane do Nascimento |
author_facet |
Monte, Christiane do Nascimento Rodrigues, Ana Paula de Castro Freitas, Alexandre Rafael de Freire, Aline Soares Santelli, Ricardo Erthal Braz, Bernardo Ferreira Machado, Wilson |
author_role |
author |
author2 |
Rodrigues, Ana Paula de Castro Freitas, Alexandre Rafael de Freire, Aline Soares Santelli, Ricardo Erthal Braz, Bernardo Ferreira Machado, Wilson |
author2_role |
author author author author author author |
dc.contributor.author.fl_str_mv |
Monte, Christiane do Nascimento Rodrigues, Ana Paula de Castro Freitas, Alexandre Rafael de Freire, Aline Soares Santelli, Ricardo Erthal Braz, Bernardo Ferreira Machado, Wilson |
dc.subject.por.fl_str_mv |
Bioavailability resuspension Guanabara Bay remobilization trace metals |
topic |
Bioavailability resuspension Guanabara Bay remobilization trace metals |
description |
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. |
publishDate |
2019 |
dc.date.none.fl_str_mv |
2019-06-06 |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
https://www.revistas.usp.br/bjoce/article/view/161574 10.1590/s1679-87592019022706701 |
url |
https://www.revistas.usp.br/bjoce/article/view/161574 |
identifier_str_mv |
10.1590/s1679-87592019022706701 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
https://www.revistas.usp.br/bjoce/article/view/161574/155528 |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
application/pdf |
dc.publisher.none.fl_str_mv |
Universidade de São Paulo. Instituto Oceanográfico |
publisher.none.fl_str_mv |
Universidade de São Paulo. Instituto Oceanográfico |
dc.source.none.fl_str_mv |
Brazilian Journal of Oceanography; Vol. 67 (2019); e19227 Brazilian Journal of Oceanography; v. 67 (2019); e19227 Brazilian Journal of Oceanography; Vol. 67 (2019); e19227 1982-436X 1679-8759 reponame:Brazilian Journal of Oceanography instname:Universidade de São Paulo (USP) instacron:USP |
instname_str |
Universidade de São Paulo (USP) |
instacron_str |
USP |
institution |
USP |
reponame_str |
Brazilian Journal of Oceanography |
collection |
Brazilian Journal of Oceanography |
repository.name.fl_str_mv |
Brazilian Journal of Oceanography - Universidade de São Paulo (USP) |
repository.mail.fl_str_mv |
io@usp.br||io@usp.br |
_version_ |
1800223771853848576 |