Óxidos de ferro e monazita de areias de praias do Espírito Santo

Detalhes bibliográficos
Autor(a) principal: Coelho,Flávia dos Santos
Data de Publicação: 2005
Outros Autores: Couceiro,Paulo Rogério da Costa, Lopes,Ana Lúcia, Fabris,José Domingos
Tipo de documento: Artigo
Idioma: por
Título da fonte: Química Nova (Online)
Texto Completo: http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0100-40422005000200013
Resumo: Sand samples collected from two sampling sites on Guarapari and Iriri beaches, state of Espírito Santo, Brazil, were studied in an attempt to better describe their chemical and mineralogical compositions and radioactive behaviors. The sands were found to contain about 6 (Guarapari) and 2 dag kg-1 (Iriri) of rare earth and thorium that, if allocated to the monazite-(Ce) structure, lead to the averaged formulae Ce3+0,494Gd3+0,012La3+0,209Nd3+0,177Pr3+0,040Sm3+0,024Th4+0,033 (PO4) and Ce3+0,474La3+0,227Nd3+0,190Pr3+0,044Sm3+0,032Th4+0,024 (PO4). From Mössbauer spectroscopy data, the magnetic fractions of these sands were found to contain stoichiometric hematite (47.4 dag kg-1, from Guarapari, and 25.1 dag kg-1, from Iriri) and magnetite (44.1 and 58.8 dag kg-1). The specific alpha and beta radiation activities were also measured for both samples.
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spelling Óxidos de ferro e monazita de areias de praias do Espírito Santoiron oxidesrare earthMössbauerSand samples collected from two sampling sites on Guarapari and Iriri beaches, state of Espírito Santo, Brazil, were studied in an attempt to better describe their chemical and mineralogical compositions and radioactive behaviors. The sands were found to contain about 6 (Guarapari) and 2 dag kg-1 (Iriri) of rare earth and thorium that, if allocated to the monazite-(Ce) structure, lead to the averaged formulae Ce3+0,494Gd3+0,012La3+0,209Nd3+0,177Pr3+0,040Sm3+0,024Th4+0,033 (PO4) and Ce3+0,474La3+0,227Nd3+0,190Pr3+0,044Sm3+0,032Th4+0,024 (PO4). From Mössbauer spectroscopy data, the magnetic fractions of these sands were found to contain stoichiometric hematite (47.4 dag kg-1, from Guarapari, and 25.1 dag kg-1, from Iriri) and magnetite (44.1 and 58.8 dag kg-1). The specific alpha and beta radiation activities were also measured for both samples.Sociedade Brasileira de Química2005-03-01info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersiontext/htmlhttp://old.scielo.br/scielo.php?script=sci_arttext&pid=S0100-40422005000200013Química Nova v.28 n.2 2005reponame:Química Nova (Online)instname:Sociedade Brasileira de Química (SBQ)instacron:SBQ10.1590/S0100-40422005000200013info:eu-repo/semantics/openAccessCoelho,Flávia dos SantosCouceiro,Paulo Rogério da CostaLopes,Ana LúciaFabris,José Domingospor2005-05-04T00:00:00Zoai:scielo:S0100-40422005000200013Revistahttps://www.scielo.br/j/qn/ONGhttps://old.scielo.br/oai/scielo-oai.phpquimicanova@sbq.org.br1678-70640100-4042opendoar:2005-05-04T00:00Química Nova (Online) - Sociedade Brasileira de Química (SBQ)false
dc.title.none.fl_str_mv Óxidos de ferro e monazita de areias de praias do Espírito Santo
title Óxidos de ferro e monazita de areias de praias do Espírito Santo
spellingShingle Óxidos de ferro e monazita de areias de praias do Espírito Santo
Coelho,Flávia dos Santos
iron oxides
rare earth
Mössbauer
title_short Óxidos de ferro e monazita de areias de praias do Espírito Santo
title_full Óxidos de ferro e monazita de areias de praias do Espírito Santo
title_fullStr Óxidos de ferro e monazita de areias de praias do Espírito Santo
title_full_unstemmed Óxidos de ferro e monazita de areias de praias do Espírito Santo
title_sort Óxidos de ferro e monazita de areias de praias do Espírito Santo
author Coelho,Flávia dos Santos
author_facet Coelho,Flávia dos Santos
Couceiro,Paulo Rogério da Costa
Lopes,Ana Lúcia
Fabris,José Domingos
author_role author
author2 Couceiro,Paulo Rogério da Costa
Lopes,Ana Lúcia
Fabris,José Domingos
author2_role author
author
author
dc.contributor.author.fl_str_mv Coelho,Flávia dos Santos
Couceiro,Paulo Rogério da Costa
Lopes,Ana Lúcia
Fabris,José Domingos
dc.subject.por.fl_str_mv iron oxides
rare earth
Mössbauer
topic iron oxides
rare earth
Mössbauer
description Sand samples collected from two sampling sites on Guarapari and Iriri beaches, state of Espírito Santo, Brazil, were studied in an attempt to better describe their chemical and mineralogical compositions and radioactive behaviors. The sands were found to contain about 6 (Guarapari) and 2 dag kg-1 (Iriri) of rare earth and thorium that, if allocated to the monazite-(Ce) structure, lead to the averaged formulae Ce3+0,494Gd3+0,012La3+0,209Nd3+0,177Pr3+0,040Sm3+0,024Th4+0,033 (PO4) and Ce3+0,474La3+0,227Nd3+0,190Pr3+0,044Sm3+0,032Th4+0,024 (PO4). From Mössbauer spectroscopy data, the magnetic fractions of these sands were found to contain stoichiometric hematite (47.4 dag kg-1, from Guarapari, and 25.1 dag kg-1, from Iriri) and magnetite (44.1 and 58.8 dag kg-1). The specific alpha and beta radiation activities were also measured for both samples.
publishDate 2005
dc.date.none.fl_str_mv 2005-03-01
dc.type.driver.fl_str_mv info:eu-repo/semantics/article
dc.type.status.fl_str_mv info:eu-repo/semantics/publishedVersion
format article
status_str publishedVersion
dc.identifier.uri.fl_str_mv http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0100-40422005000200013
url http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0100-40422005000200013
dc.language.iso.fl_str_mv por
language por
dc.relation.none.fl_str_mv 10.1590/S0100-40422005000200013
dc.rights.driver.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv text/html
dc.publisher.none.fl_str_mv Sociedade Brasileira de Química
publisher.none.fl_str_mv Sociedade Brasileira de Química
dc.source.none.fl_str_mv Química Nova v.28 n.2 2005
reponame:Química Nova (Online)
instname:Sociedade Brasileira de Química (SBQ)
instacron:SBQ
instname_str Sociedade Brasileira de Química (SBQ)
instacron_str SBQ
institution SBQ
reponame_str Química Nova (Online)
collection Química Nova (Online)
repository.name.fl_str_mv Química Nova (Online) - Sociedade Brasileira de Química (SBQ)
repository.mail.fl_str_mv quimicanova@sbq.org.br
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