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Selenium speciation in waste materials from an exhausted Iberian Pyrite Belt mine

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dc.contributor.authorFigueiredo, M. Ondina
dc.contributor.authorSilva, Teresa
dc.contributor.authorVeiga, JP
dc.contributor.authorBatista, Maria Joao
dc.contributor.authorSalas-Colera, Eduardo
dc.contributor.authorde Oliveira, Daniel Pipa Soares
dc.date.accessioned2015-01-24T19:06:18Z
dc.date.available2015-01-24T19:06:18Z
dc.date.issued2014
dc.description.abstractSelenium is an essential nutrient for humans, animals and microorganisms, but it becomes toxic at concentrations slightly above the nutritional levels. This naturally occurring trace element can be released to the environment from various anthropogenic sources such as mining, agricultural, petrochemical and industrial processes and its toxicity is developed along a complex cycle involving adsorption by soil components and subsequent accumulation by plants. In the environment, selenium can occur in several oxidation states ranging from selenide (Se=) to elemental selenium (Se0), selenite (Se4+) and selenate (Se6+). Selenium contents above 900 ppm were recently assigned in mine wastes from the sulphur factory at the São Domingos exhausted pyrite mine exploited in the Iberian Pyrite Belt (south Portugal) since Roman times until 1966. Aiming at a sustainable remediation of this mining site, an X-ray absorption spectroscopy study using synchrotron radiation, combined with X-ray diffraction, was undertaken to clarify the speciation state of selenium and the nature of Se-carrier phase(s). The results show that selenium does not significantly replace sulphur under the form of selenate in the dominant sulphate phases and occasionally remains as a substituting selenide anion in debris of the original sulphides present in the mine waste materials.por
dc.identifier.citationFigueiredo, Maria O... [et al.] - Selenium speciation in waste materials from an exhausted Iberian Pyrite Belt mine. In: Journal of Materials Science Research, vol. 3, nº 4, 2014, p. 22-30por
dc.identifier.doihttp://dx.doi.org/10.5539/jmsr.v3n4p22
dc.identifier.issn1927-0585
dc.identifier.urihttp://hdl.handle.net/10400.9/2586
dc.language.isoengpor
dc.subjectMinas abandonadaspor
dc.subjectResíduos mineirospor
dc.subjectGestão de resíduospor
dc.subjectRecuperação ambientalpor
dc.subjectSeléniopor
dc.subjectXANESpor
dc.subjectAbsorção de raios Xpor
dc.subjectEspectroscopiapor
dc.subjectMina de S. Domingos (concelho de Mértola, Portugal)por
dc.subjectFaixa Piritosa Ibéricapor
dc.titleSelenium speciation in waste materials from an exhausted Iberian Pyrite Belt minepor
dc.typejournal article
dspace.entity.typePublication
oaire.citation.titleJournal of Materials Science Researchpor
person.familyNameSilva
person.familyNameVeiga
person.familyNameBatista
person.familyNamede Oliveira
person.givenNameTeresa
person.givenNameJoão Pedro
person.givenNameMaria Joao
person.givenNameDaniel Pipa Soares
person.identifier92033
person.identifier2216267
person.identifier.ciencia-idB916-C501-8AA3
person.identifier.ciencia-idD81C-9EE7-8B61
person.identifier.ciencia-idC01A-B2B1-C2D0
person.identifier.ciencia-idA11D-DDD7-29F2
person.identifier.orcid0000-0002-0306-1015
person.identifier.orcid0000-0001-5324-1586
person.identifier.orcid0000-0003-0197-1004
person.identifier.orcid0000-0002-6338-8845
person.identifier.ridL-9359-2013
person.identifier.ridJ-3681-2013
person.identifier.ridAGY-5000-2022
person.identifier.scopus-author-id7005146574
person.identifier.scopus-author-id7005481948
rcaap.rightsopenAccesspor
rcaap.typearticlepor
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relation.isAuthorOfPublication.latestForDiscoverye3d4c3a2-65c9-44d1-acd7-5c09468b7a24

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