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Assessment of trace element pollution and its environmental risk to freshwater sediments influenced by anthropogenic contributions: The case study of Alqueva reservoir (Guadiana Basin)

2015-05Journal article Open access
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dc.contributor.authorPalma, Patricia
dc.contributor.authorLedo, Lidia
dc.contributor.authorAlvarenga, Paula
dc.date.accessioned2018-12-07T14:53:49Z
dc.date.available2018-12-07T14:53:49Z
dc.date.issued2015-05
dc.description.abstractThe Guadiana Basin.(SW Iberian Peninsula) is affected by acid mine drainage (AMD), a consequence of ancient mining activities in the Iberian Pyrite Belt (IPB). Consequently, the sedimerits at the Alqueva reservoir (SE Portugal) in the Guadiana Basin are potentially contaminated by trace elements, which make important: (i) to characterize the status of trace element pollution of the sediments; (ii) to evaluate the mobility and the bioavailability of As, Cd, Cu, Cr, Pb and Zn; and (iii) to assess the environmental risk associated with the total and bioavailable concentrations of trace elements, using the sediment quality guidelines (SQGs) and the risk assessment code (RAC). Metal enrichment factors (EF) and geoaccumulation indexes (I-geo), determined taking into account the regional background levels, revealed that, among the metals analyzed, Cd contributed the highest to pollution levels followed by Pb and As. Despite the trace element contamination of the Alqueva sediments, the sequential extraction showed that Most of them are found in the oxidizable and residual fractions, which indicates that they are sparingly bioavailable, with exception of Cd (acid-labile fraction) and Pb (reducible fraction). Based on the RAC, Cd was the only metal that presented a high risk, while Pb, As and Zn showed a medium risk. Moreover, the SQGs revealed the existence of certain areas of extremely high risk, particularly related to high concentrations of total As and, in less extent, of Pb and Cd, associated with AMD, wastewater discharges and runoff of plant protection products from agricultural fields located near the reservoir. (C) 2015 Elsevier By. All rights reserved.
dc.description.sponsorshipFCT (Fundacao para a Ciencia e Tecnologia) [PTDC/AAC-AMB/103547/2008]; FEDER, through POFC (Eixo I - Programa Operacional Fatores de Competitividade) from QREN [COMPETE Re: FCOMP-01-0124-FEDER-008582]
dc.description.versioninfo:eu-repo/semantics/publishedVersion
dc.identifier.doi10.1016/j.catena.2015.02.002
dc.identifier.issn0341-8162
dc.identifier.issn1872-6887
dc.identifier.urihttp://hdl.handle.net/10400.1/11703
dc.language.isoeng
dc.peerreviewedyes
dc.publisherElsevier Science Bv
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/
dc.subjectSequential extraction procedure
dc.subjectHeavy-metal pollution
dc.subjectIberian pyrite belt
dc.subjectEstuarine sediments
dc.subjectSurface sediments
dc.subjectCadmium Bioaccumulation
dc.subjectShelf sediments
dc.subjectRiver sediments
dc.subjectToxic elements
dc.subjectUrban soils
dc.titleAssessment of trace element pollution and its environmental risk to freshwater sediments influenced by anthropogenic contributions: The case study of Alqueva reservoir (Guadiana Basin)
dc.typejournal article
dspace.entity.typePublication
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/5876-PPCDTI/PTDC%2FAAC-AMB%2F103547%2F2008/PT
oaire.citation.endPage184
oaire.citation.startPage174
oaire.citation.titleCATENA
oaire.citation.volume128
oaire.fundingStream5876-PPCDTI
person.familyNamePalma
person.givenNamePatrícia
person.identifier.ciencia-idA511-25AD-8A99
person.identifier.orcid0000-0002-9719-079X
person.identifier.scopus-author-id36883197800
project.funder.identifierhttp://doi.org/10.13039/501100001871
project.funder.nameFundação para a Ciência e a Tecnologia
rcaap.rightsopenAccess
rcaap.typearticle
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relation.isAuthorOfPublication.latestForDiscoverye67ebf3d-65f3-4d73-9eaa-d1fac6ff6a82
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relation.isProjectOfPublication.latestForDiscoveryffbaab4a-23f5-405b-9e58-49fb8ac4c944

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