Oxidation of lactic acid by Vanadium(V) in sulphuric acid medium: a kinetic and mechanistic study
Autor(a) principal: | |
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Data de Publicação: | 1993 |
Outros Autores: | |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Institucional da FURG (RI FURG) |
Texto Completo: | http://repositorio.furg.br/handle/1/4579 |
Resumo: | The rate of lactic acid, HL, oxidation by vanadium(V), V(V), in sulphuric acid solution has been measured by monitoring, spectrophotometrically, the absorbance change of vanadium(IV), V(IV) in 760 nm at 30°C. This oxidation is a acid-catalysed, its dependence on acidity being complex. The rate constant or not the ionic strength. This reaction exhibited first order dependence on the V(V) and HL concentrations respectively and minimal dependence on sulphuric acid at lower concentrations (0.25 - 1.00 M) and fractionary (n = 0.40) at higher range (1.25 - 1.75 M) in constant ionic strength. Without this control, the sulphuric acid dependence was greater and the order (n = 1.71) was practically doubled in the higher concentration range (1.00 - 1.75 M) when compared with the lower one (0.25 - 0.75 M) and equal to 0.87. Dielectric constant decrease of the medium increased the rate constant. Energy of activation and parameters of activation were calculated studying the reaction at different temperatures. Oxidation mechanisms are proposed. |
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Clementin, Rosilene MariaTakashima, Keiko2014-09-18T21:19:31Z2014-09-18T21:19:31Z1993CLEMENTIN, Rosilene Maria; TAKASHIMA, Keiko. Oxidation of lactic acid by Vanadium(V) in sulphuric acid medium: a kinetic and mechanistic study. Química Nova, v. 16, n. 6, p. 529-533, 1993. Disponível em: <http://migre.me/lAYr0>. Acesso em: 12 set. 20140100-4042http://repositorio.furg.br/handle/1/4579The rate of lactic acid, HL, oxidation by vanadium(V), V(V), in sulphuric acid solution has been measured by monitoring, spectrophotometrically, the absorbance change of vanadium(IV), V(IV) in 760 nm at 30°C. This oxidation is a acid-catalysed, its dependence on acidity being complex. The rate constant or not the ionic strength. This reaction exhibited first order dependence on the V(V) and HL concentrations respectively and minimal dependence on sulphuric acid at lower concentrations (0.25 - 1.00 M) and fractionary (n = 0.40) at higher range (1.25 - 1.75 M) in constant ionic strength. Without this control, the sulphuric acid dependence was greater and the order (n = 1.71) was practically doubled in the higher concentration range (1.00 - 1.75 M) when compared with the lower one (0.25 - 0.75 M) and equal to 0.87. Dielectric constant decrease of the medium increased the rate constant. Energy of activation and parameters of activation were calculated studying the reaction at different temperatures. Oxidation mechanisms are proposed.engLactic acidOxidation kineticsVanadium(V) oxidationOxidation of lactic acid by Vanadium(V) in sulphuric acid medium: a kinetic and mechanistic studyinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleinfo:eu-repo/semantics/openAccessreponame:Repositório Institucional da FURG (RI FURG)instname:Universidade Federal do Rio Grande (FURG)instacron:FURGORIGINALOxidation of lactic acid by Vanadium(V) in sulphuric acid medium - a kinetic and mechanistic study.pdfOxidation of lactic acid by Vanadium(V) in sulphuric acid medium - a kinetic and mechanistic study.pdfapplication/pdf367364https://repositorio.furg.br/bitstream/1/4579/1/Oxidation%20of%20lactic%20acid%20by%20Vanadium%28V%29%20in%20sulphuric%20acid%20medium%20-%20a%20kinetic%20and%20mechanistic%20study.pdf571e6e65f01e322672eff9a5c5195376MD51open accessLICENSElicense.txtlicense.txttext/plain; charset=utf-81748https://repositorio.furg.br/bitstream/1/4579/2/license.txt8a4605be74aa9ea9d79846c1fba20a33MD52open access1/45792014-09-18 18:19:31.806open accessoai:repositorio.furg.br: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Repositório InstitucionalPUBhttps://repositorio.furg.br/oai/request || http://200.19.254.174/oai/requestopendoar:2014-09-18T21:19:31Repositório Institucional da FURG (RI FURG) - Universidade Federal do Rio Grande (FURG)false |
dc.title.pt_BR.fl_str_mv |
Oxidation of lactic acid by Vanadium(V) in sulphuric acid medium: a kinetic and mechanistic study |
title |
Oxidation of lactic acid by Vanadium(V) in sulphuric acid medium: a kinetic and mechanistic study |
spellingShingle |
Oxidation of lactic acid by Vanadium(V) in sulphuric acid medium: a kinetic and mechanistic study Clementin, Rosilene Maria Lactic acid Oxidation kinetics Vanadium(V) oxidation |
title_short |
Oxidation of lactic acid by Vanadium(V) in sulphuric acid medium: a kinetic and mechanistic study |
title_full |
Oxidation of lactic acid by Vanadium(V) in sulphuric acid medium: a kinetic and mechanistic study |
title_fullStr |
Oxidation of lactic acid by Vanadium(V) in sulphuric acid medium: a kinetic and mechanistic study |
title_full_unstemmed |
Oxidation of lactic acid by Vanadium(V) in sulphuric acid medium: a kinetic and mechanistic study |
title_sort |
Oxidation of lactic acid by Vanadium(V) in sulphuric acid medium: a kinetic and mechanistic study |
author |
Clementin, Rosilene Maria |
author_facet |
Clementin, Rosilene Maria Takashima, Keiko |
author_role |
author |
author2 |
Takashima, Keiko |
author2_role |
author |
dc.contributor.author.fl_str_mv |
Clementin, Rosilene Maria Takashima, Keiko |
dc.subject.por.fl_str_mv |
Lactic acid Oxidation kinetics Vanadium(V) oxidation |
topic |
Lactic acid Oxidation kinetics Vanadium(V) oxidation |
description |
The rate of lactic acid, HL, oxidation by vanadium(V), V(V), in sulphuric acid solution has been measured by monitoring, spectrophotometrically, the absorbance change of vanadium(IV), V(IV) in 760 nm at 30°C. This oxidation is a acid-catalysed, its dependence on acidity being complex. The rate constant or not the ionic strength. This reaction exhibited first order dependence on the V(V) and HL concentrations respectively and minimal dependence on sulphuric acid at lower concentrations (0.25 - 1.00 M) and fractionary (n = 0.40) at higher range (1.25 - 1.75 M) in constant ionic strength. Without this control, the sulphuric acid dependence was greater and the order (n = 1.71) was practically doubled in the higher concentration range (1.00 - 1.75 M) when compared with the lower one (0.25 - 0.75 M) and equal to 0.87. Dielectric constant decrease of the medium increased the rate constant. Energy of activation and parameters of activation were calculated studying the reaction at different temperatures. Oxidation mechanisms are proposed. |
publishDate |
1993 |
dc.date.issued.fl_str_mv |
1993 |
dc.date.accessioned.fl_str_mv |
2014-09-18T21:19:31Z |
dc.date.available.fl_str_mv |
2014-09-18T21:19:31Z |
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.citation.fl_str_mv |
CLEMENTIN, Rosilene Maria; TAKASHIMA, Keiko. Oxidation of lactic acid by Vanadium(V) in sulphuric acid medium: a kinetic and mechanistic study. Química Nova, v. 16, n. 6, p. 529-533, 1993. Disponível em: <http://migre.me/lAYr0>. Acesso em: 12 set. 2014 |
dc.identifier.uri.fl_str_mv |
http://repositorio.furg.br/handle/1/4579 |
dc.identifier.issn.none.fl_str_mv |
0100-4042 |
identifier_str_mv |
CLEMENTIN, Rosilene Maria; TAKASHIMA, Keiko. Oxidation of lactic acid by Vanadium(V) in sulphuric acid medium: a kinetic and mechanistic study. Química Nova, v. 16, n. 6, p. 529-533, 1993. Disponível em: <http://migre.me/lAYr0>. Acesso em: 12 set. 2014 0100-4042 |
url |
http://repositorio.furg.br/handle/1/4579 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.source.none.fl_str_mv |
reponame:Repositório Institucional da FURG (RI FURG) instname:Universidade Federal do Rio Grande (FURG) instacron:FURG |
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Universidade Federal do Rio Grande (FURG) |
instacron_str |
FURG |
institution |
FURG |
reponame_str |
Repositório Institucional da FURG (RI FURG) |
collection |
Repositório Institucional da FURG (RI FURG) |
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