Electrochemical behavior of rhodium acetamidate immobilized on a carbon paste electrode: a hydrazine sensor
Autor(a) principal: | |
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Data de Publicação: | 2000 |
Outros Autores: | |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Journal of the Brazilian Chemical Society (Online) |
Texto Completo: | http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0103-50532000000300018 |
Resumo: | The electrochemical behavior of rhodium acetamidate immobilized in carbon paste electrode and the consequences for sensor construction were evaluated. The electrode showed good stability and redox properties. Two reversible redox couples with midpoint potentials between 0.15 and 0.55 V vs SCE were observed. However, peak resolution in voltammetric studies was very dependent on the supporting electrolyte. The correlation between coordinating power of the electrolyte and peak potential suggests that the electrolyte can coordinate through the axial position of the complexes. Furthermore, the axial position may be also the catalytic site, as a catalytical response was observed for hydrazine oxidation. A good linear response range for hydrazine was fit by the equation i = 23.13 (± 0.34) c , where i = current in mA and c = concentration in mol dm-3 in the range of 10-5 up to 10-2 mol dm-3. The low applied potential (<300 mV) indicates a good device for hydrazine sensor, minimizing interference problems. The short response time (~1 s) may be useful in flow injection analysis. Furthermore, this system was very stable presenting good repeatability even after 30 measurements with a variance of 0.5 %. |
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Electrochemical behavior of rhodium acetamidate immobilized on a carbon paste electrode: a hydrazine sensorrhodium acetamidateelectrochemical sensorshydrazine determinationcarbon paste electrodepolyethylenimineThe electrochemical behavior of rhodium acetamidate immobilized in carbon paste electrode and the consequences for sensor construction were evaluated. The electrode showed good stability and redox properties. Two reversible redox couples with midpoint potentials between 0.15 and 0.55 V vs SCE were observed. However, peak resolution in voltammetric studies was very dependent on the supporting electrolyte. The correlation between coordinating power of the electrolyte and peak potential suggests that the electrolyte can coordinate through the axial position of the complexes. Furthermore, the axial position may be also the catalytic site, as a catalytical response was observed for hydrazine oxidation. A good linear response range for hydrazine was fit by the equation i = 23.13 (± 0.34) c , where i = current in mA and c = concentration in mol dm-3 in the range of 10-5 up to 10-2 mol dm-3. The low applied potential (<300 mV) indicates a good device for hydrazine sensor, minimizing interference problems. The short response time (~1 s) may be useful in flow injection analysis. Furthermore, this system was very stable presenting good repeatability even after 30 measurements with a variance of 0.5 %.Sociedade Brasileira de Química2000-06-01info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersiontext/htmlhttp://old.scielo.br/scielo.php?script=sci_arttext&pid=S0103-50532000000300018Journal of the Brazilian Chemical Society v.11 n.3 2000reponame:Journal of the Brazilian Chemical Society (Online)instname:Sociedade Brasileira de Química (SBQ)instacron:SBQ10.1590/S0103-50532000000300018info:eu-repo/semantics/openAccessGil,Eric de S.Kubota,Lauro T.eng2000-11-06T00:00:00Zoai:scielo:S0103-50532000000300018Revistahttp://jbcs.sbq.org.brONGhttps://old.scielo.br/oai/scielo-oai.php||office@jbcs.sbq.org.br1678-47900103-5053opendoar:2000-11-06T00:00Journal of the Brazilian Chemical Society (Online) - Sociedade Brasileira de Química (SBQ)false |
dc.title.none.fl_str_mv |
Electrochemical behavior of rhodium acetamidate immobilized on a carbon paste electrode: a hydrazine sensor |
title |
Electrochemical behavior of rhodium acetamidate immobilized on a carbon paste electrode: a hydrazine sensor |
spellingShingle |
Electrochemical behavior of rhodium acetamidate immobilized on a carbon paste electrode: a hydrazine sensor Gil,Eric de S. rhodium acetamidate electrochemical sensors hydrazine determination carbon paste electrode polyethylenimine |
title_short |
Electrochemical behavior of rhodium acetamidate immobilized on a carbon paste electrode: a hydrazine sensor |
title_full |
Electrochemical behavior of rhodium acetamidate immobilized on a carbon paste electrode: a hydrazine sensor |
title_fullStr |
Electrochemical behavior of rhodium acetamidate immobilized on a carbon paste electrode: a hydrazine sensor |
title_full_unstemmed |
Electrochemical behavior of rhodium acetamidate immobilized on a carbon paste electrode: a hydrazine sensor |
title_sort |
Electrochemical behavior of rhodium acetamidate immobilized on a carbon paste electrode: a hydrazine sensor |
author |
Gil,Eric de S. |
author_facet |
Gil,Eric de S. Kubota,Lauro T. |
author_role |
author |
author2 |
Kubota,Lauro T. |
author2_role |
author |
dc.contributor.author.fl_str_mv |
Gil,Eric de S. Kubota,Lauro T. |
dc.subject.por.fl_str_mv |
rhodium acetamidate electrochemical sensors hydrazine determination carbon paste electrode polyethylenimine |
topic |
rhodium acetamidate electrochemical sensors hydrazine determination carbon paste electrode polyethylenimine |
description |
The electrochemical behavior of rhodium acetamidate immobilized in carbon paste electrode and the consequences for sensor construction were evaluated. The electrode showed good stability and redox properties. Two reversible redox couples with midpoint potentials between 0.15 and 0.55 V vs SCE were observed. However, peak resolution in voltammetric studies was very dependent on the supporting electrolyte. The correlation between coordinating power of the electrolyte and peak potential suggests that the electrolyte can coordinate through the axial position of the complexes. Furthermore, the axial position may be also the catalytic site, as a catalytical response was observed for hydrazine oxidation. A good linear response range for hydrazine was fit by the equation i = 23.13 (± 0.34) c , where i = current in mA and c = concentration in mol dm-3 in the range of 10-5 up to 10-2 mol dm-3. The low applied potential (<300 mV) indicates a good device for hydrazine sensor, minimizing interference problems. The short response time (~1 s) may be useful in flow injection analysis. Furthermore, this system was very stable presenting good repeatability even after 30 measurements with a variance of 0.5 %. |
publishDate |
2000 |
dc.date.none.fl_str_mv |
2000-06-01 |
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=S0103-50532000000300018 |
url |
http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0103-50532000000300018 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
10.1590/S0103-50532000000300018 |
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 |
Journal of the Brazilian Chemical Society v.11 n.3 2000 reponame:Journal of the Brazilian Chemical Society (Online) instname:Sociedade Brasileira de Química (SBQ) instacron:SBQ |
instname_str |
Sociedade Brasileira de Química (SBQ) |
instacron_str |
SBQ |
institution |
SBQ |
reponame_str |
Journal of the Brazilian Chemical Society (Online) |
collection |
Journal of the Brazilian Chemical Society (Online) |
repository.name.fl_str_mv |
Journal of the Brazilian Chemical Society (Online) - Sociedade Brasileira de Química (SBQ) |
repository.mail.fl_str_mv |
||office@jbcs.sbq.org.br |
_version_ |
1750318164136165376 |