Especiação de cromo em cimentos e derivados de cimento brasileiros

Detalhes bibliográficos
Autor(a) principal: Matos,Wladiana Oliveira
Data de Publicação: 2009
Outros Autores: Nóbrega,Joaquim Araújo
Tipo de documento: Artigo
Idioma: por
Título da fonte: Química Nova (Online)
Texto Completo: http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0100-40422009000800020
Resumo: A method for determination of Cr(III) and Cr(VI) in cement and cement-related materials was studied. Molecular absorption spectrophotometry based on 1,5-diphenylcarbazide as chromogenic reagent was used for determination of Cr(VI) after alkaline extraction. The total chromium concentration was determined using flame atomic absorption spectrometry (FAAS) after complete sample decomposition by fusion. The quantification of Cr(III) was accomplished by subtracting the Cr(VI) concentration from the total chromium concentration. The concentration of Cr(III) in the samples ranged from 10.9 to 88.0 mg kg-1, whereas only in few samples the Cr(VI) concentration was higher than the value established by the European Community to this type of sample [2 mg kg-1 Cr(VI)].
id SBQ-3_57d533bbe6e4388c62a24de2f4fc9f95
oai_identifier_str oai:scielo:S0100-40422009000800020
network_acronym_str SBQ-3
network_name_str Química Nova (Online)
repository_id_str
spelling Especiação de cromo em cimentos e derivados de cimento brasileiroschromiumspeciationcementA method for determination of Cr(III) and Cr(VI) in cement and cement-related materials was studied. Molecular absorption spectrophotometry based on 1,5-diphenylcarbazide as chromogenic reagent was used for determination of Cr(VI) after alkaline extraction. The total chromium concentration was determined using flame atomic absorption spectrometry (FAAS) after complete sample decomposition by fusion. The quantification of Cr(III) was accomplished by subtracting the Cr(VI) concentration from the total chromium concentration. The concentration of Cr(III) in the samples ranged from 10.9 to 88.0 mg kg-1, whereas only in few samples the Cr(VI) concentration was higher than the value established by the European Community to this type of sample [2 mg kg-1 Cr(VI)].Sociedade Brasileira de Química2009-01-01info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersiontext/htmlhttp://old.scielo.br/scielo.php?script=sci_arttext&pid=S0100-40422009000800020Química Nova v.32 n.8 2009reponame:Química Nova (Online)instname:Sociedade Brasileira de Química (SBQ)instacron:SBQ10.1590/S0100-40422009000800020info:eu-repo/semantics/openAccessMatos,Wladiana OliveiraNóbrega,Joaquim Araújopor2009-11-26T00:00:00Zoai:scielo:S0100-40422009000800020Revistahttps://www.scielo.br/j/qn/ONGhttps://old.scielo.br/oai/scielo-oai.phpquimicanova@sbq.org.br1678-70640100-4042opendoar:2009-11-26T00:00Química Nova (Online) - Sociedade Brasileira de Química (SBQ)false
dc.title.none.fl_str_mv Especiação de cromo em cimentos e derivados de cimento brasileiros
title Especiação de cromo em cimentos e derivados de cimento brasileiros
spellingShingle Especiação de cromo em cimentos e derivados de cimento brasileiros
Matos,Wladiana Oliveira
chromium
speciation
cement
title_short Especiação de cromo em cimentos e derivados de cimento brasileiros
title_full Especiação de cromo em cimentos e derivados de cimento brasileiros
title_fullStr Especiação de cromo em cimentos e derivados de cimento brasileiros
title_full_unstemmed Especiação de cromo em cimentos e derivados de cimento brasileiros
title_sort Especiação de cromo em cimentos e derivados de cimento brasileiros
author Matos,Wladiana Oliveira
author_facet Matos,Wladiana Oliveira
Nóbrega,Joaquim Araújo
author_role author
author2 Nóbrega,Joaquim Araújo
author2_role author
dc.contributor.author.fl_str_mv Matos,Wladiana Oliveira
Nóbrega,Joaquim Araújo
dc.subject.por.fl_str_mv chromium
speciation
cement
topic chromium
speciation
cement
description A method for determination of Cr(III) and Cr(VI) in cement and cement-related materials was studied. Molecular absorption spectrophotometry based on 1,5-diphenylcarbazide as chromogenic reagent was used for determination of Cr(VI) after alkaline extraction. The total chromium concentration was determined using flame atomic absorption spectrometry (FAAS) after complete sample decomposition by fusion. The quantification of Cr(III) was accomplished by subtracting the Cr(VI) concentration from the total chromium concentration. The concentration of Cr(III) in the samples ranged from 10.9 to 88.0 mg kg-1, whereas only in few samples the Cr(VI) concentration was higher than the value established by the European Community to this type of sample [2 mg kg-1 Cr(VI)].
publishDate 2009
dc.date.none.fl_str_mv 2009-01-01
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=S0100-40422009000800020
url http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0100-40422009000800020
dc.language.iso.fl_str_mv por
language por
dc.relation.none.fl_str_mv 10.1590/S0100-40422009000800020
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.32 n.8 2009
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
_version_ 1750318109863968768

Registros relacionados