New methodology for pH measurements in fuel ethanol using glass electrode

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dc.contributor.authorDa Silva, Ricardo Moutinho [UNESP]
dc.contributor.authorBorges, Paulo Paschoal
dc.contributor.authorSerta Fraga, Isabel Cristina
dc.contributor.authorStradiotto, Nelson Ramos [UNESP]
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.contributor.institutionNormalização e Qualidade Industrial (INMETRO)
dc.date.accessioned2014-05-27T11:25:26Z
dc.date.available2014-05-27T11:25:26Z
dc.date.issued2011-01-01
dc.description.abstractStudies carried out with glass electrode in anhydrous ethanol and ethanol-water solutions for measuring pH values have shown that this parameter depends on the solution composition, the contact time with the solution, the utilized temperature, and the type of electrolyte used. It was also observed that the glass electrode behavior in an acid medium differs from an alkaline medium. These studies provided correction factors for pH values from 2 to 12, allowing the realization of proper measurements of the hydrogen ionic activity in the ethanol-water and anhydrous ethanol solutions. However, these correction factors could not be applied to the fuel ethanol. Alternatively, a new method was developed for the correction of the pH values, which can be applied in hydrous and anhydrous fuel ethanol samples. Copyright © 2011 by ASTM International.en
dc.description.affiliationDept. of Analytical Chemistry Institute of Chemistry UNESP, Rua Francisco Degni, s/n, Bairro Quitandinha, 14800-900 Araraquara, São Paolo
dc.description.affiliationDivisão de Metrologia Química Instituto Nacional de Metrologia Normalização e Qualidade Industrial (INMETRO), CEP: 25250-020, Rio de Janeiro, Rio de Janeiro
dc.description.affiliationUnespDept. of Analytical Chemistry Institute of Chemistry UNESP, Rua Francisco Degni, s/n, Bairro Quitandinha, 14800-900 Araraquara, São Paolo
dc.identifierhttp://dx.doi.org/10.1520/JAI103192
dc.identifier.citationJournal of ASTM International, v. 8, n. 1, 2011.
dc.identifier.doi10.1520/JAI103192
dc.identifier.issn1546-962X
dc.identifier.lattes0072173018005712
dc.identifier.scopus2-s2.0-78751674643
dc.identifier.urihttp://hdl.handle.net/11449/72254
dc.language.isoeng
dc.relation.ispartofJournal of ASTM International
dc.rights.accessRightsAcesso restrito
dc.sourceScopus
dc.subjectEthanol-water solutions
dc.subjectFuel ethanol
dc.subjectGlass electrode
dc.subjectpH
dc.subjectAcid medium
dc.subjectAlkaline medium
dc.subjectAnhydrous ethanol
dc.subjectContact time
dc.subjectCorrection factors
dc.subjectEthanol-water
dc.subjectGlass electrodes
dc.subjectIonic activity
dc.subjectMeasuring pH
dc.subjectPH measurements
dc.subjectpH value
dc.subjectSolution composition
dc.subjectElectrodes
dc.subjectFuels
dc.subjectGlass
dc.subjectpH effects
dc.subjectEthanol
dc.titleNew methodology for pH measurements in fuel ethanol using glass electrodeen
dc.typeArtigo
dcterms.licensehttp://jai.peerx-press.org/html/jai/astm_cpy_agree.pdf
unesp.author.lattes0072173018005712
unesp.campusUniversidade Estadual Paulista (Unesp), Instituto de Química, Araraquarapt

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Artigos - Química Analítica - IQ