Potencialidades do dióxido de chumbo eletrodepositado como sensor potenciométrico
Autor(a) principal: | |
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Data de Publicação: | 1998 |
Outros Autores: | |
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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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 |
_version_ |
1750318100527448064 |