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Sources and distribution of yttrium and rare earth elements in surface sediments from Tagus estuary, Portugal

2018Journal article Restricted access
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dc.contributor.authorBrito, Pedro
dc.contributor.authorPrego, Ricardo
dc.contributor.authorMil-Homens, Mário
dc.contributor.authorCaçador, Isabel
dc.contributor.authorCaetano, Miguel
dc.date.accessioned2019-06-07T10:12:32Z
dc.date.available2019-06-07T10:12:32Z
dc.date.issued2018
dc.description.abstractThe distribution and sources of yttrium and rare-earth elements (YREE) in surface sediments were studied on 78 samples collected in the Tagus estuary (SW Portugal, SW Europe). Yttrium and total REE contents ranged from 2.4 to 32mg·kg-1 and 18 to 210mg·kg-1, respectively, and exhibited significant correlations with sediment grain-size, Al, Fe, Mg and Mn, suggesting a preferential association to fine-grained material (e.g. aluminosilicates but also Al hydroxides and Fe oxyhydroxides). The PAAS (Post-Archean Australian Shale) normalized patterns display three distinct YREE fractionation pattern groups along the Tagus estuary: a first group, characterized by medium to coarse-grained material, a depleted and almost flat PAAS-normalized pattern, with a positive anomaly of Eu, representing one of the lithogenic components; a second group, characterized mainly by fine-grained sediment, with higher shale-normalized ratios and an enrichment of LREE relative to HREE, associated with waste water treatment plant (WWTP) outfalls, located in the northern margin; and, a third group, of fine-grained material, marked by a significant enrichment of Y, a depletion of Ce and an enrichment of HREE over LREE, located near an inactive chemical-industrial complex (e.g. pyrite roast plant, chemical and phosphorous fertilizer industries), in the southern margin. The data allow the quantification of the YREE contents and its spatial distribution in the surface sediments of the Tagus estuary, identifying the main potential sources and confirming the use of rare earth elements as tracers of anthropogenic activities in highly hydrodynamic estuaries.pt_PT
dc.description.versioninfo:eu-repo/semantics/publishedVersionpt_PT
dc.identifier.doi10.1016/j.scitotenv.2017.11.245pt_PT
dc.identifier.issn0048-9697
dc.identifier.urihttp://hdl.handle.net/10451/38501
dc.language.isoengpt_PT
dc.peerreviewedyespt_PT
dc.subjectRare earth elementspt_PT
dc.subjectYttriumpt_PT
dc.subjectContaminationpt_PT
dc.subjectSurface sedimentspt_PT
dc.subjectTagus estuarypt_PT
dc.subjectPortugalpt_PT
dc.titleSources and distribution of yttrium and rare earth elements in surface sediments from Tagus estuary, Portugalpt_PT
dc.typejournal article
dspace.entity.typePublication
oaire.citation.endPage325pt_PT
oaire.citation.startPage317pt_PT
oaire.citation.titleScience of the Total Environmentpt_PT
oaire.citation.volume621pt_PT
person.familyNameCaçador
person.givenNameIsabel
person.identifier.ciencia-id631C-9FFE-CA81
person.identifier.orcid0000-0002-4475-6091
person.identifier.ridC-2618-2012
person.identifier.scopus-author-id6602533871
rcaap.rightsrestrictedAccesspt_PT
rcaap.typearticlept_PT
relation.isAuthorOfPublication02ecb390-88b9-4e2f-8690-eba66c3b5311
relation.isAuthorOfPublication.latestForDiscovery02ecb390-88b9-4e2f-8690-eba66c3b5311

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