Modified and Optimized Glass Electrode for pH Measurements in Hydrated Ethanol Fuel

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dc.contributor.authorAtilio, Natalia Cambiaghi
dc.contributor.authorFertonani, Fernando Luis [UNESP]
dc.contributor.authorOliveira, Elcio Cruz de
dc.contributor.institutionPontifical Catholic University of Rio de Janeiro
dc.contributor.institutionUniversidade Estadual Paulista (UNESP)
dc.contributor.institutionPETROBRAS S.A
dc.date.accessioned2023-07-29T15:15:12Z
dc.date.available2023-07-29T15:15:12Z
dc.date.issued2022-11-01
dc.description.abstractOne of the quality control parameters of ethanol fuel is pH, established by the Brazilian standard ABNT NBR 10891, whose scope is specific for hydrated ethanol fuel, and by the American standard ASTM D 6423, which focuses on anhydrous ethanol fuel. This study presented a modified and optimized structure using a single solvent, both for the glass electrode and the external reference electrode, to minimize the presence of the liquid junction potential for measuring the pH of hydrated ethanol fuel. The Box–Behnken design enabled us to determine the optimal condition expected for the new measurement system, which was compared with the systems proposed by the standard references and the turning range of acid–base indicators using parametric and nonparametric tests. The results revealed that the pH values obtained by the different systems are statistically different, and that only the values obtained by this proposal are suitable for the pH range found by the indicators. The optimized electrode presented an adequate response sensitivity to the Nernst equation, having an operational behavior adequate for the modified and optimized glass electrode for pH measurements in hydrated ethanol fuel.en
dc.description.affiliationPostgraduate Programme in Metrology Pontifical Catholic University of Rio de Janeiro
dc.description.affiliationBiosciences Languages and Exact Sciences Institute (Ibilce) São Paulo State University (Unesp), Rua Cristovão Colombo, 2265, Jardim Nazareth
dc.description.affiliationLogistics Operational Planning and Control Measurement and Product Inventory Management PETROBRAS S.A
dc.description.affiliationUnespBiosciences Languages and Exact Sciences Institute (Ibilce) São Paulo State University (Unesp), Rua Cristovão Colombo, 2265, Jardim Nazareth
dc.identifierhttp://dx.doi.org/10.3390/molecules27228048
dc.identifier.citationMolecules, v. 27, n. 22, 2022.
dc.identifier.doi10.3390/molecules27228048
dc.identifier.issn1420-3049
dc.identifier.scopus2-s2.0-85142621301
dc.identifier.urihttp://hdl.handle.net/11449/249405
dc.language.isoeng
dc.relation.ispartofMolecules
dc.sourceScopus
dc.subjectchemometrics
dc.subjectethanol pH
dc.subjecthydrous ethanol fuel
dc.subjectmetrology
dc.subjectmodified and optimized glass electrode
dc.subjectpH indicators
dc.titleModified and Optimized Glass Electrode for pH Measurements in Hydrated Ethanol Fuelen
dc.typeArtigo
unesp.author.orcid0000-0001-8979-4131[3]

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