A pH optode based on thymol blue: application to determination of CO2 using flow injection analysis system

Detalhes bibliográficos
Autor(a) principal: Sotomayor,M.D.P.T.
Data de Publicação: 2010
Outros Autores: Raimundo Jr,I.M., Rohwedder,J.J. R., Oliveira Neto,G.
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Eclética Química
Texto Completo: http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0100-46702010000200004
Resumo: An optode based on thymol blue (TB), an acid-based indicator, has been constructed and evaluated as a detector in FIA system for CO2 determination. The dye was chemically immobilised on the surface of a bifurcated glass optical fibre bundle, using silanisation in organic media. In FIA system, hydrogen carbonate or carbonate samples are injected in a buffer carrier solution, and then are mixed with phosphoric acid solution to generate CO2, which diffuses through a PTFE membrane, in order to be collected in an acceptor carrier fluid, pumped towards to detection cell, in which the optode was adapted. The proposed system presents two linear response ranges, from 1.0 x 10-3 to 1.0 x 10-2 mol l-1, and from 2.0 x 10-2 to 0.10 mol l-1. The sampling frequency was 11 sample h-1, with good repeatability (R.S.D < 4 %, n = 10). In flow conditions the optode lifetime was 170 h. The system was applied in the analysis of commercial mineral water and the results obtained in the hydrogen carbonate determination did not differ significantly from those obtained by potentiometry, at a confidence level of 95 %.
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spelling A pH optode based on thymol blue: application to determination of CO2 using flow injection analysis systemCO2FIAthymol bluesilanisationpH-optodeAn optode based on thymol blue (TB), an acid-based indicator, has been constructed and evaluated as a detector in FIA system for CO2 determination. The dye was chemically immobilised on the surface of a bifurcated glass optical fibre bundle, using silanisation in organic media. In FIA system, hydrogen carbonate or carbonate samples are injected in a buffer carrier solution, and then are mixed with phosphoric acid solution to generate CO2, which diffuses through a PTFE membrane, in order to be collected in an acceptor carrier fluid, pumped towards to detection cell, in which the optode was adapted. The proposed system presents two linear response ranges, from 1.0 x 10-3 to 1.0 x 10-2 mol l-1, and from 2.0 x 10-2 to 0.10 mol l-1. The sampling frequency was 11 sample h-1, with good repeatability (R.S.D < 4 %, n = 10). In flow conditions the optode lifetime was 170 h. The system was applied in the analysis of commercial mineral water and the results obtained in the hydrogen carbonate determination did not differ significantly from those obtained by potentiometry, at a confidence level of 95 %.Fundação Editora da Universidade Estadual Paulista Júlio de Mesquita Filho - UNESP2010-01-01info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersiontext/htmlhttp://old.scielo.br/scielo.php?script=sci_arttext&pid=S0100-46702010000200004Eclética Química v.35 n.2 2010reponame:Eclética Químicainstname:Universidade Estadual Paulista Júlio de Mesquita Filho (UNESP)instacron:UNESP10.1590/S0100-46702010000200004info:eu-repo/semantics/openAccessSotomayor,M.D.P.T.Raimundo Jr,I.M.Rohwedder,J.J. R.Oliveira Neto,G.eng2010-07-26T00:00:00Zoai:scielo:S0100-46702010000200004Revistahttp://revista.iq.unesp.br/ojs/index.php/ecletica/PUBhttps://revista.iq.unesp.br/ojs/index.php/ecletica/oaiecletica@ctrlk.com.br||ecletica@iq.unesp.br1678-46181678-4618opendoar:2010-07-26T00:00Eclética Química - Universidade Estadual Paulista Júlio de Mesquita Filho (UNESP)false
dc.title.none.fl_str_mv A pH optode based on thymol blue: application to determination of CO2 using flow injection analysis system
title A pH optode based on thymol blue: application to determination of CO2 using flow injection analysis system
spellingShingle A pH optode based on thymol blue: application to determination of CO2 using flow injection analysis system
Sotomayor,M.D.P.T.
CO2
FIA
thymol blue
silanisation
pH-optode
title_short A pH optode based on thymol blue: application to determination of CO2 using flow injection analysis system
title_full A pH optode based on thymol blue: application to determination of CO2 using flow injection analysis system
title_fullStr A pH optode based on thymol blue: application to determination of CO2 using flow injection analysis system
title_full_unstemmed A pH optode based on thymol blue: application to determination of CO2 using flow injection analysis system
title_sort A pH optode based on thymol blue: application to determination of CO2 using flow injection analysis system
author Sotomayor,M.D.P.T.
author_facet Sotomayor,M.D.P.T.
Raimundo Jr,I.M.
Rohwedder,J.J. R.
Oliveira Neto,G.
author_role author
author2 Raimundo Jr,I.M.
Rohwedder,J.J. R.
Oliveira Neto,G.
author2_role author
author
author
dc.contributor.author.fl_str_mv Sotomayor,M.D.P.T.
Raimundo Jr,I.M.
Rohwedder,J.J. R.
Oliveira Neto,G.
dc.subject.por.fl_str_mv CO2
FIA
thymol blue
silanisation
pH-optode
topic CO2
FIA
thymol blue
silanisation
pH-optode
description An optode based on thymol blue (TB), an acid-based indicator, has been constructed and evaluated as a detector in FIA system for CO2 determination. The dye was chemically immobilised on the surface of a bifurcated glass optical fibre bundle, using silanisation in organic media. In FIA system, hydrogen carbonate or carbonate samples are injected in a buffer carrier solution, and then are mixed with phosphoric acid solution to generate CO2, which diffuses through a PTFE membrane, in order to be collected in an acceptor carrier fluid, pumped towards to detection cell, in which the optode was adapted. The proposed system presents two linear response ranges, from 1.0 x 10-3 to 1.0 x 10-2 mol l-1, and from 2.0 x 10-2 to 0.10 mol l-1. The sampling frequency was 11 sample h-1, with good repeatability (R.S.D < 4 %, n = 10). In flow conditions the optode lifetime was 170 h. The system was applied in the analysis of commercial mineral water and the results obtained in the hydrogen carbonate determination did not differ significantly from those obtained by potentiometry, at a confidence level of 95 %.
publishDate 2010
dc.date.none.fl_str_mv 2010-01-01
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=S0100-46702010000200004
url http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0100-46702010000200004
dc.language.iso.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv 10.1590/S0100-46702010000200004
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 Fundação Editora da Universidade Estadual Paulista Júlio de Mesquita Filho - UNESP
publisher.none.fl_str_mv Fundação Editora da Universidade Estadual Paulista Júlio de Mesquita Filho - UNESP
dc.source.none.fl_str_mv Eclética Química v.35 n.2 2010
reponame:Eclética Química
instname:Universidade Estadual Paulista Júlio de Mesquita Filho (UNESP)
instacron:UNESP
instname_str Universidade Estadual Paulista Júlio de Mesquita Filho (UNESP)
instacron_str UNESP
institution UNESP
reponame_str Eclética Química
collection Eclética Química
repository.name.fl_str_mv Eclética Química - Universidade Estadual Paulista Júlio de Mesquita Filho (UNESP)
repository.mail.fl_str_mv ecletica@ctrlk.com.br||ecletica@iq.unesp.br
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