Potencialidades do dióxido de chumbo eletrodepositado como sensor potenciométrico

Detalhes bibliográficos
Autor(a) principal: Capelato,Milton Duffles
Data de Publicação: 1998
Outros Autores: Cassiano,Neila Maria
Tipo de documento: Artigo
Idioma: por
Título da fonte: Química Nova (Online)
Texto Completo: http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0100-40421998000400022
Resumo: This paper proposes an experiment to be performed in both instrumental analysis and experimental physical-chemistry curricular disciplines in order to open options to develop challenging basic research activities. Thus the experimental procedures and the results obtained in the preparation of electrodeposited lead dioxide onto graphite and its evaluation as potentiometric sensor for H3O+ and Pb2+ ions, are presented. The data obtained in acid-base titrations were compared with those of the traditional combination glass electrode at the same conditions. Although a linear sub-Nernstian response to free hydrogen ions was observed for the electrodeposited PbO2 electrode, a good agreement was obtained between them. Working as lead(II) sensing electrode, the PbO2 showed a linear sub-Nernstian behavior at total Pb2+ concentrations ranging from 3,5 x 10-4 to 3,0 x 10-2 mol/L in nitrate media. For the redox couple PbO2/Pb(II) the operational slope converges to the theoretical one, as the acidity of the working solution increases.
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spelling Potencialidades do dióxido de chumbo eletrodepositado como sensor potenciométricolead dioxide electrodepositionacid-base titrationPb(II) íon seletive electrodeThis paper proposes an experiment to be performed in both instrumental analysis and experimental physical-chemistry curricular disciplines in order to open options to develop challenging basic research activities. Thus the experimental procedures and the results obtained in the preparation of electrodeposited lead dioxide onto graphite and its evaluation as potentiometric sensor for H3O+ and Pb2+ ions, are presented. The data obtained in acid-base titrations were compared with those of the traditional combination glass electrode at the same conditions. Although a linear sub-Nernstian response to free hydrogen ions was observed for the electrodeposited PbO2 electrode, a good agreement was obtained between them. Working as lead(II) sensing electrode, the PbO2 showed a linear sub-Nernstian behavior at total Pb2+ concentrations ranging from 3,5 x 10-4 to 3,0 x 10-2 mol/L in nitrate media. For the redox couple PbO2/Pb(II) the operational slope converges to the theoretical one, as the acidity of the working solution increases.Sociedade Brasileira de Química1998-07-01info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersiontext/htmlhttp://old.scielo.br/scielo.php?script=sci_arttext&pid=S0100-40421998000400022Química Nova v.21 n.4 1998reponame:Química Nova (Online)instname:Sociedade Brasileira de Química (SBQ)instacron:SBQ10.1590/S0100-40421998000400022info:eu-repo/semantics/openAccessCapelato,Milton DufflesCassiano,Neila Mariapor2002-11-05T00:00:00Zoai:scielo:S0100-40421998000400022Revistahttps://www.scielo.br/j/qn/ONGhttps://old.scielo.br/oai/scielo-oai.phpquimicanova@sbq.org.br1678-70640100-4042opendoar:2002-11-05T00:00Química Nova (Online) - Sociedade Brasileira de Química (SBQ)false
dc.title.none.fl_str_mv Potencialidades do dióxido de chumbo eletrodepositado como sensor potenciométrico
title Potencialidades do dióxido de chumbo eletrodepositado como sensor potenciométrico
spellingShingle Potencialidades do dióxido de chumbo eletrodepositado como sensor potenciométrico
Capelato,Milton Duffles
lead dioxide electrodeposition
acid-base titration
Pb(II) íon seletive electrode
title_short Potencialidades do dióxido de chumbo eletrodepositado como sensor potenciométrico
title_full Potencialidades do dióxido de chumbo eletrodepositado como sensor potenciométrico
title_fullStr Potencialidades do dióxido de chumbo eletrodepositado como sensor potenciométrico
title_full_unstemmed Potencialidades do dióxido de chumbo eletrodepositado como sensor potenciométrico
title_sort Potencialidades do dióxido de chumbo eletrodepositado como sensor potenciométrico
author Capelato,Milton Duffles
author_facet Capelato,Milton Duffles
Cassiano,Neila Maria
author_role author
author2 Cassiano,Neila Maria
author2_role author
dc.contributor.author.fl_str_mv Capelato,Milton Duffles
Cassiano,Neila Maria
dc.subject.por.fl_str_mv lead dioxide electrodeposition
acid-base titration
Pb(II) íon seletive electrode
topic lead dioxide electrodeposition
acid-base titration
Pb(II) íon seletive electrode
description This paper proposes an experiment to be performed in both instrumental analysis and experimental physical-chemistry curricular disciplines in order to open options to develop challenging basic research activities. Thus the experimental procedures and the results obtained in the preparation of electrodeposited lead dioxide onto graphite and its evaluation as potentiometric sensor for H3O+ and Pb2+ ions, are presented. The data obtained in acid-base titrations were compared with those of the traditional combination glass electrode at the same conditions. Although a linear sub-Nernstian response to free hydrogen ions was observed for the electrodeposited PbO2 electrode, a good agreement was obtained between them. Working as lead(II) sensing electrode, the PbO2 showed a linear sub-Nernstian behavior at total Pb2+ concentrations ranging from 3,5 x 10-4 to 3,0 x 10-2 mol/L in nitrate media. For the redox couple PbO2/Pb(II) the operational slope converges to the theoretical one, as the acidity of the working solution increases.
publishDate 1998
dc.date.none.fl_str_mv 1998-07-01
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=S0100-40421998000400022
url http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0100-40421998000400022
dc.language.iso.fl_str_mv por
language por
dc.relation.none.fl_str_mv 10.1590/S0100-40421998000400022
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.21 n.4 1998
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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