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Distribution of Fe, Mn, Cu and Cd in upper sediments and sediment-trap material of Ria Formosa (Portugal)

2002Journal article Restricted access
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dc.contributor.authorCaetano, M.
dc.contributor.authorVale, C.
dc.contributor.authorBebianno, Maria João
dc.date.accessioned2020-05-26T20:02:51Z
dc.date.available2020-05-26T20:02:51Z
dc.date.issued2002
dc.description.abstractIn shallow highly productive coastal environments intense biogeochemical activity is concentrated in the upper sediment layers. However, pore water composition of permeable inter-tidal sediments change as water flows over the areas during ebb and flood tides. In order to examine metal post-mobilisation, inter-tidal sediment cores of 4 cm length and particles settled in sediment-traps over several periods during 10 months were collected in Ria Formosa (SW Iberian Peninsula). Concentrations of Al, Fe, Mn, Cu and Cd, loss on ignition and the proportion of fine fraction were determined in sediment layers of 0.5 cm thickness and in sediment-trap material. Levels of Mn in sediments were similar to those in sediment-trap material, although enrichment in the topmost sediment layer (0.1 mm) was observed as MnO2 is formed. Although Fe in sediments and sediment-trap material ranged within similar intervals, two relationships with Al were found showing that sediment-trap material are impoverished in Fe in comparison to sediments. This suggests that Fe is mainly cycled inside the sediment. Copper and Cd exhibited different patterns. Levels in sediment-trap material were not correlated to Al or LOI, probably due to local contamination or uptake by plankton. These values were lower than levels in the topmost sediment layer, suggesting that Cu and Cd that reach the sediment surface are rapidly released to the water column. Concentrations in sediments, including the topmost layer, exhibited two relationships to Al, for both Cu and Cd. One corresponding to background values and the other found in stations closer to the anthropogenic sources. In these cases Cu and Cd are incorporated into the sediments that is facilitated by AVS values close to the sediment surface.pt_PT
dc.description.versioninfo:eu-repo/semantics/publishedVersionpt_PT
dc.identifier.doi10.2112 / 1551-5036-36.sp1.118pt_PT
dc.identifier.issn0749-0208
dc.identifier.urihttp://hdl.handle.net/10400.1/13949
dc.language.isoengpt_PT
dc.peerreviewedyespt_PT
dc.publisherCoastal Education and Research Foundationpt_PT
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/pt_PT
dc.subjectSurface sedimentspt_PT
dc.subjectHeavy metalspt_PT
dc.subjectGeochemistrypt_PT
dc.subjectCoastal lagoonpt_PT
dc.subjectPortugalpt_PT
dc.titleDistribution of Fe, Mn, Cu and Cd in upper sediments and sediment-trap material of Ria Formosa (Portugal)pt_PT
dc.typejournal article
dspace.entity.typePublication
oaire.citation.endPage123pt_PT
oaire.citation.issue36pt_PT
oaire.citation.startPage118pt_PT
oaire.citation.titleJournal of Coastal Researchpt_PT
person.familyNameBebianno
person.givenNameMaria
person.identifier.ciencia-id2B11-46AC-B94B
person.identifier.orcid0000-0003-1492-8566
person.identifier.scopus-author-id7004152715
rcaap.rightsrestrictedAccesspt_PT
rcaap.typearticlept_PT
relation.isAuthorOfPublication2e00a26d-1dd3-4c22-a6bf-ac7943ae0d32
relation.isAuthorOfPublication.latestForDiscovery2e00a26d-1dd3-4c22-a6bf-ac7943ae0d32

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