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Heavy metal and PCB spatial distribution pattern in sediments within an urban catchment: contribution of historical pollution sources

2016Journal article Restricted access
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datacite.subject.sdg11:Cidades e Comunidades Sustentáveispt_PT
dc.contributor.authorFerreira, Célia
dc.contributor.authorPato, Rosinda L.
dc.contributor.authorVarejão, Jorge B.
dc.contributor.authorTavares, Alexandre O.
dc.contributor.authorFerreira, Antonio J. D.
dc.date.accessioned2023-07-03T12:52:08Z
dc.date.available2023-07-03T12:52:08Z
dc.date.issued2016
dc.description.abstractPurpose This work analyzes polychlorinated biphenyl (PCB) and heavy metal contamination in fluvial sediments and soils in an urban catchment, according to the geo-accumulation index and to soil and sediment quality guidelines. The catchment is located in Coimbra, Portugal, being affected by frequent flooding, and its main stream is a tributary to one of the major rivers in Portugal (Mondego). Given the presence of industrial activities over time, some inputs of pollutants are expected, but so far, the legacy of historic pollution in this catchment has not yet been investigated. Materials and methods Twenty-five samples were collected from nine sampling sites at the depths of 0–20, 20–40 and 40– 60 cm (to provide a historic perspective) along longitudinal profiles (streamlines) and in soils downstream of pollution sources. These samples were analyzed for six heavy metals (Cu, Cr, Pb, Cd, Zn, Ni), organic carbon, pH and ten PCBs (IUPAC numbers 28, 30, 52, 101, 138, 153, 166, 180, 204, 209). Results and discussion Total PCB concentrations ranged 0.47–5.3 ng g−1 dry weight (dw), and levels increase from the bottom to the top layers, suggesting an increased input over the last 100 years. PCB congener distribution shows the dominance of hexachlorobiphenyls, especially PCB138, suggesting the existence of local sources. PCB levels did not exceed sediment quality levels, placing sediments/soil under class 1 (not contaminated) or class 2 (trace contamination) with respect to PCB. All six metals exceeded the lowest effect level for sediment quality criteria, and three (Cd, Pb and Zn) largely exceeded the clean levels for dredged materials, placing sediments in class 5 (heavily contaminated). Sampling site S1 presented the highest concentrations of Zn, Pb and Cd, and historic vehicle traffic was identified as the most likely source, given the vertical and horizontal profiles. Conclusions High levels of Pb, Cd and Zn were found in fluvial sediments at some locations of the Loreto catchment, likely from historic traffic sources. This urban area is frequently affected by flooding events and is currently being subject to urban redevelopment. During these events/actions, historic pollutants in the sediments might surface and be redistributed, impacting the downstream ecosystem of the major Mondego River or increasing the risk of exposure of the urban population.pt_PT
dc.description.versioninfo:eu-repo/semantics/publishedVersionpt_PT
dc.identifier.doi10.1007/s11368-016-1542-ypt_PT
dc.identifier.urihttp://hdl.handle.net/10400.2/14177
dc.language.isoengpt_PT
dc.peerreviewedyespt_PT
dc.publisherSpringer Naturept_PT
dc.relationNanoDC - Electrokinetic remediation of soil contaminated with persistent organic pollutants using iron nanoparticles
dc.relationResearch Centre for Natural Resources, Environment and Society - CERNAS
dc.relationRAW - Recovering nutrients from wastes: eco-innovative solutions to transform waste into resources
dc.subjectHeavy metalspt_PT
dc.subjectHistoric pollutionpt_PT
dc.subjectPbpt_PT
dc.subjectPCBpt_PT
dc.subjectRiver sedimentspt_PT
dc.subjectTraffic emissionspt_PT
dc.titleHeavy metal and PCB spatial distribution pattern in sediments within an urban catchment: contribution of historical pollution sourcespt_PT
dc.typejournal article
dspace.entity.typePublication
oaire.awardTitleNanoDC - Electrokinetic remediation of soil contaminated with persistent organic pollutants using iron nanoparticles
oaire.awardTitleResearch Centre for Natural Resources, Environment and Society - CERNAS
oaire.awardTitleRAW - Recovering nutrients from wastes: eco-innovative solutions to transform waste into resources
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/5876-PPCDTI/PTDC%2FAGR-AAM%2F101643%2F2008/PT
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/6817 - DCRRNI ID/UID%2FAMB%2F00681%2F2013/PT
oaire.awardURIinfo:eu-repo/grantAgreement/FCT//SFRH%2FBPD%2F100717%2F2014/PT
oaire.citation.endPage2605pt_PT
oaire.citation.startPage2594pt_PT
oaire.citation.titleJournal of Soils and Sedimentspt_PT
oaire.fundingStream5876-PPCDTI
oaire.fundingStream6817 - DCRRNI ID
person.familyNameFerreira
person.givenNameCélia
person.identifier.ciencia-id931E-FBDE-2098
person.identifier.orcid0000-0002-7456-2538
project.funder.identifierhttp://doi.org/10.13039/501100001871
project.funder.identifierhttp://doi.org/10.13039/501100001871
project.funder.identifierhttp://doi.org/10.13039/501100001871
project.funder.nameFundação para a Ciência e a Tecnologia
project.funder.nameFundação para a Ciência e a Tecnologia
project.funder.nameFundação para a Ciência e a Tecnologia
rcaap.rightsrestrictedAccesspt_PT
rcaap.typearticlept_PT
relation.isAuthorOfPublicatione30010dd-0512-4da6-a0c9-910b47f18b4f
relation.isAuthorOfPublication.latestForDiscoverye30010dd-0512-4da6-a0c9-910b47f18b4f
relation.isProjectOfPublicationa463c816-6254-4b42-8676-f96fcd1cdf24
relation.isProjectOfPublication2719cb70-67e0-4145-b44d-5e3edaf84a3a
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