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Influence of Aveiro Lagoon heavy metal contents in the adjacent continental shelf (Portugal)

dc.contributor.authorAbrantes, I.
dc.contributor.authorRocha, F.
dc.contributor.authorVidinha, J.
dc.contributor.authorDias, João A.
dc.date.accessioned2018-12-07T14:57:49Z
dc.date.available2018-12-07T14:57:49Z
dc.date.issued2005-05
dc.description.abstractA chemical analysis of Al, Ca, Fe, Mg, Cu, Pb, Zn, Cr, Co, Ni and Cd was carried out in 22 surface sediment samples of the continental shelf and upper slope between Espinho and Aveiro (Portugal). To reduce the disturbing effects of grain size, all samples were size-normalized by wet sieving (< 63 mu m). The fine fraction was digested with concentrated acids and analyzed by flame atomic absorption spectrometry. The Al and heavy metal concentrations displayed a similar distribution pattern, decreasing seaward. Exceptions to this general pattern are Ca, Mg and Pb distributions. The Ca contents are related to carbonated biogenic particles that are very abundant in the outer shelf. Multivariate statistical analysis was applied to all data to assess the behaviour and sources of each element analyzed. The results from factor analysis showed that terrigenous supply (from Aveiro Lagoon flow, coastal erosion and littoral drift), grain size (clay) sorting and anthropogenic influences from Aveiro Lagoon are the major factors controlling spatial variations of chemical elements in the continental shelf between Espinho and Aveiro. Unusually high contents of Pb were found in the middle shelf off Furadouro, but we could not determine the possible source of this contamination.
dc.description.versioninfo:eu-repo/semantics/publishedVersion
dc.identifier.doi10.7773/cm.v31i12.99
dc.identifier.issn0185-3880
dc.identifier.urihttp://hdl.handle.net/10400.1/11717
dc.language.isospa
dc.peerreviewedyes
dc.publisherUniversidad Autónoma de Baja California
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/
dc.subjectSediments
dc.subjectEstuarine
dc.titleInfluence of Aveiro Lagoon heavy metal contents in the adjacent continental shelf (Portugal)
dc.typejournal article
dspace.entity.typePublication
oaire.citation.endPage160
oaire.citation.issue1B
oaire.citation.startPage149
oaire.citation.titleCiencias Marinas
oaire.citation.volume31
rcaap.rightsopenAccess
rcaap.typearticle

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