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: | Repositório Institucional da UNESP |
Texto Completo: | http://dx.doi.org/10.1590/S0103-50531998000200005 http://hdl.handle.net/11449/65626 |
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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Repositório Institucional da UNESP |
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Spectrophotometric determination of manganese in steels by on-line electrochemical oxidationCoulometric reagent generationFIAManganeseSpectrophotometryThe 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.Departamento de Química Univ. Federal de Santa Catarina, C.P. 476, 88040-900 Florianópolis - SCDepto. de Quim. Analítica Instituto de Química UNESP, C.P. 355, 14800-900 Araraquara - SPDepto. de Quim. Analítica Instituto de Química UNESP, C.P. 355, 14800-900 Araraquara - SPUniversidade Federal de Santa Catarina (UFSC)Universidade Estadual Paulista (Unesp)Saint'Pierre, Tatiana D.De Queiróz, Roldão R. U.De Souza, Ivan G.Gomes Neto, José Anchieta [UNESP]2014-05-27T11:19:39Z2014-05-27T11:19:39Z1998-12-01info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/article145-150application/pdfhttp://dx.doi.org/10.1590/S0103-50531998000200005Journal of the Brazilian Chemical Society, v. 9, n. 2, p. 145-150, 1998.0103-5053http://hdl.handle.net/11449/6562610.1590/S0103-50531998000200005S0103-50531998000200005WOS:0000747493000052-s2.0-00052197552-s2.0-0005219755.pdf8708735699846578Scopusreponame:Repositório Institucional da UNESPinstname:Universidade Estadual Paulista (UNESP)instacron:UNESPengJournal of the Brazilian Chemical Society1.4440,357info:eu-repo/semantics/openAccess2024-01-10T06:24:50Zoai:repositorio.unesp.br:11449/65626Repositório InstitucionalPUBhttp://repositorio.unesp.br/oai/requestopendoar:29462024-01-10T06:24:50Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP)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 Saint'Pierre, Tatiana D. Coulometric reagent generation FIA Manganese Spectrophotometry |
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 |
Saint'Pierre, Tatiana D. |
author_facet |
Saint'Pierre, Tatiana D. De Queiróz, Roldão R. U. De Souza, Ivan G. Gomes Neto, José Anchieta [UNESP] |
author_role |
author |
author2 |
De Queiróz, Roldão R. U. De Souza, Ivan G. Gomes Neto, José Anchieta [UNESP] |
author2_role |
author author author |
dc.contributor.none.fl_str_mv |
Universidade Federal de Santa Catarina (UFSC) Universidade Estadual Paulista (Unesp) |
dc.contributor.author.fl_str_mv |
Saint'Pierre, Tatiana D. De Queiróz, Roldão R. U. De Souza, Ivan G. Gomes Neto, José Anchieta [UNESP] |
dc.subject.por.fl_str_mv |
Coulometric reagent generation FIA Manganese Spectrophotometry |
topic |
Coulometric reagent generation FIA Manganese Spectrophotometry |
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 |
1998-12-01 2014-05-27T11:19:39Z 2014-05-27T11:19:39Z |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
http://dx.doi.org/10.1590/S0103-50531998000200005 Journal of the Brazilian Chemical Society, v. 9, n. 2, p. 145-150, 1998. 0103-5053 http://hdl.handle.net/11449/65626 10.1590/S0103-50531998000200005 S0103-50531998000200005 WOS:000074749300005 2-s2.0-0005219755 2-s2.0-0005219755.pdf 8708735699846578 |
url |
http://dx.doi.org/10.1590/S0103-50531998000200005 http://hdl.handle.net/11449/65626 |
identifier_str_mv |
Journal of the Brazilian Chemical Society, v. 9, n. 2, p. 145-150, 1998. 0103-5053 10.1590/S0103-50531998000200005 S0103-50531998000200005 WOS:000074749300005 2-s2.0-0005219755 2-s2.0-0005219755.pdf 8708735699846578 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
Journal of the Brazilian Chemical Society 1.444 0,357 |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
145-150 application/pdf |
dc.source.none.fl_str_mv |
Scopus reponame:Repositório Institucional da UNESP instname:Universidade Estadual Paulista (UNESP) instacron:UNESP |
instname_str |
Universidade Estadual Paulista (UNESP) |
instacron_str |
UNESP |
institution |
UNESP |
reponame_str |
Repositório Institucional da UNESP |
collection |
Repositório Institucional da UNESP |
repository.name.fl_str_mv |
Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP) |
repository.mail.fl_str_mv |
|
_version_ |
1803047307024793600 |