Spectrophotometric Determination of Manganese in Steels by On-Line Electrochemical Oxidation
Autor(a) principal: | |
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Data de Publicação: | 1998 |
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=S0103-50531998000200005 |
Resumo: | The aim of this work is to propose a flow spectrophotometric procedure for manganese determination in steel based on electrochemical oxidation of Mn(II) to Mn(VII) at a Pt electrode surface by means of the catalytic effect of Ag(I). The on-line oxidation step was obtained by injecting sample and electrolyte solution directly into an electrolytic cell. After electrolysis, the injectate was homogenized by bubbling air. The permanganate ions produced were passed through the spectrophotometer where absorbance was monitored at 545 nm. Effects of direct current, silver concentration, timing, flow rates, concentration and composition of support electrolyte were investigated. Direct current and silver content manifested themselves as the most relevant parameters. For determination of manganese in the 5.00 - 150 mg L-1 range (r = 0,9998) and 60 s electrolysis time, the sample throughput was 20 h-1. Accuracy was assessed by analyzing ten steel standard reference materials. Results are precise (R.S.D. < 3%) and in agreement with certified values of reference materials and with standard methods at 95% confidence level. |
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Spectrophotometric Determination of Manganese in Steels by On-Line Electrochemical OxidationmanganeseFIAspectrophotometrycoulometric reagent generationThe aim of this work is to propose a flow spectrophotometric procedure for manganese determination in steel based on electrochemical oxidation of Mn(II) to Mn(VII) at a Pt electrode surface by means of the catalytic effect of Ag(I). The on-line oxidation step was obtained by injecting sample and electrolyte solution directly into an electrolytic cell. After electrolysis, the injectate was homogenized by bubbling air. The permanganate ions produced were passed through the spectrophotometer where absorbance was monitored at 545 nm. Effects of direct current, silver concentration, timing, flow rates, concentration and composition of support electrolyte were investigated. Direct current and silver content manifested themselves as the most relevant parameters. For determination of manganese in the 5.00 - 150 mg L-1 range (r = 0,9998) and 60 s electrolysis time, the sample throughput was 20 h-1. Accuracy was assessed by analyzing ten steel standard reference materials. Results are precise (R.S.D. < 3%) and in agreement with certified values of reference materials and with standard methods at 95% confidence level.Sociedade Brasileira de Química1998-04-01info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersiontext/htmlhttp://old.scielo.br/scielo.php?script=sci_arttext&pid=S0103-50531998000200005Journal of the Brazilian Chemical Society v.9 n.2 1998reponame:Journal of the Brazilian Chemical Society (Online)instname:Sociedade Brasileira de Química (SBQ)instacron:SBQ10.1590/S0103-50531998000200005info:eu-repo/semantics/openAccessSaintPierre,Tatiana. D.Queiróz,Roldão R.U. deSouza,Ivan G. deGomes Neto,José A.eng2005-12-12T00:00:00Zoai:scielo:S0103-50531998000200005Revistahttp://jbcs.sbq.org.brONGhttps://old.scielo.br/oai/scielo-oai.php||office@jbcs.sbq.org.br1678-47900103-5053opendoar:2005-12-12T00:00Journal of the Brazilian Chemical Society (Online) - Sociedade Brasileira de Química (SBQ)false |
dc.title.none.fl_str_mv |
Spectrophotometric Determination of Manganese in Steels by On-Line Electrochemical Oxidation |
title |
Spectrophotometric Determination of Manganese in Steels by On-Line Electrochemical Oxidation |
spellingShingle |
Spectrophotometric Determination of Manganese in Steels by On-Line Electrochemical Oxidation SaintPierre,Tatiana. D. manganese FIA spectrophotometry coulometric reagent generation |
title_short |
Spectrophotometric Determination of Manganese in Steels by On-Line Electrochemical Oxidation |
title_full |
Spectrophotometric Determination of Manganese in Steels by On-Line Electrochemical Oxidation |
title_fullStr |
Spectrophotometric Determination of Manganese in Steels by On-Line Electrochemical Oxidation |
title_full_unstemmed |
Spectrophotometric Determination of Manganese in Steels by On-Line Electrochemical Oxidation |
title_sort |
Spectrophotometric Determination of Manganese in Steels by On-Line Electrochemical Oxidation |
author |
SaintPierre,Tatiana. D. |
author_facet |
SaintPierre,Tatiana. D. Queiróz,Roldão R.U. de Souza,Ivan G. de Gomes Neto,José A. |
author_role |
author |
author2 |
Queiróz,Roldão R.U. de Souza,Ivan G. de Gomes Neto,José A. |
author2_role |
author author author |
dc.contributor.author.fl_str_mv |
SaintPierre,Tatiana. D. Queiróz,Roldão R.U. de Souza,Ivan G. de Gomes Neto,José A. |
dc.subject.por.fl_str_mv |
manganese FIA spectrophotometry coulometric reagent generation |
topic |
manganese FIA spectrophotometry coulometric reagent generation |
description |
The aim of this work is to propose a flow spectrophotometric procedure for manganese determination in steel based on electrochemical oxidation of Mn(II) to Mn(VII) at a Pt electrode surface by means of the catalytic effect of Ag(I). The on-line oxidation step was obtained by injecting sample and electrolyte solution directly into an electrolytic cell. After electrolysis, the injectate was homogenized by bubbling air. The permanganate ions produced were passed through the spectrophotometer where absorbance was monitored at 545 nm. Effects of direct current, silver concentration, timing, flow rates, concentration and composition of support electrolyte were investigated. Direct current and silver content manifested themselves as the most relevant parameters. For determination of manganese in the 5.00 - 150 mg L-1 range (r = 0,9998) and 60 s electrolysis time, the sample throughput was 20 h-1. Accuracy was assessed by analyzing ten steel standard reference materials. Results are precise (R.S.D. < 3%) and in agreement with certified values of reference materials and with standard methods at 95% confidence level. |
publishDate |
1998 |
dc.date.none.fl_str_mv |
1998-04-01 |
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=S0103-50531998000200005 |
url |
http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0103-50531998000200005 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
10.1590/S0103-50531998000200005 |
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.9 n.2 1998 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_ |
1750318163380142080 |