A pH optode based on thymol blue: Application to determination of co2 using flow injection analy sis system

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MetadadosDescriçãoIdioma
Autor(es): dc.contributorUniversidade Estadual Paulista (UNESP)-
Autor(es): dc.contributorUniversidade Estadual de Campinas (UNICAMP)-
Autor(es): dc.contributorSecretaria Municipal de Educação-
Autor(es): dc.creatorSotomayor, M. D.P.T. [UNESP]-
Autor(es): dc.creatorRaimundo, Jr.-
Autor(es): dc.creatorRohwedder, J. J.R.-
Autor(es): dc.creatorNeto, G. Oliveira-
Data de aceite: dc.date.accessioned2022-08-04T22:09:21Z-
Data de disponibilização: dc.date.available2022-08-04T22:09:21Z-
Data de envio: dc.date.issued2022-04-28-
Data de envio: dc.date.issued2022-04-28-
Data de envio: dc.date.issued2010-01-01-
Fonte completa do material: dc.identifierhttp://dx.doi.org/10.26850/1678-4618EQJ.V35.2.2010.P33-43-
Fonte completa do material: dc.identifierhttp://hdl.handle.net/11449/221676-
Fonte: dc.identifier.urihttp://educapes.capes.gov.br/handle/11449/221676-
Descrição: dc.descriptionAn optode based on thymol blue (TB), an acid-based indicator, has been constructed and evaluated as a detector in FIA system for CO2determination. 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 10-3to 1.0 x 10-2mol l-1, and from 2.0 x 10-2to 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 %.-
Descrição: dc.descriptionInstituto de Química; Unesp, São Paulo-
Descrição: dc.descriptionInstituto de Química; Unicamp, São Paulo-
Descrição: dc.descriptionSecretaria Municipal de Educação, São Paulo-
Descrição: dc.descriptionInstituto de Química; Unesp, São Paulo-
Formato: dc.format33-43-
Idioma: dc.languageen-
Relação: dc.relationEcletica Quimica-
???dc.source???: dc.sourceScopus-
Palavras-chave: dc.subjectCO2-
Palavras-chave: dc.subjectFIA-
Palavras-chave: dc.subjectpH-optode-
Palavras-chave: dc.subjectSilanisation-
Palavras-chave: dc.subjectThymol blue-
Título: dc.titleA pH optode based on thymol blue: Application to determination of co2 using flow injection analy sis system-
Tipo de arquivo: dc.typelivro digital-
Aparece nas coleções:Repositório Institucional - Unesp

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