Graphite Screen-Printed Electrodes Applied for the Accurate and Reagentless Sensing of pH
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Título: | Graphite Screen-Printed Electrodes Applied for the Accurate and Reagentless Sensing of pH |
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Autor/es: | Galdino, Flávia E. | Smith, Jamie P. | Kwamou, Sophie I. | Kampouris, Dimitrious K. | Iniesta, Jesus | Smith, Graham C. | Bonacin, Juliano A. | Banks, Craig E. |
Grupo/s de investigación o GITE: | Electroquímica Aplicada y Electrocatálisis |
Centro, Departamento o Servicio: | Universidad de Alicante. Departamento de Química Física | Universidad de Alicante. Instituto Universitario de Electroquímica |
Palabras clave: | Reagentless pH sensor | Graphite screen-printed electrodes |
Área/s de conocimiento: | Química Física |
Fecha de publicación: | 12-nov-2015 |
Editor: | American Chemical Society |
Cita bibliográfica: | Analytical Chemistry. 2015, 87(23): 11666-11672. doi:10.1021/acs.analchem.5b01236 |
Resumen: | A reagentless pH sensor based upon disposable and economical graphite screen-printed electrodes (GSPEs) is demonstrated for the first time. The voltammetric pH sensor utilizes GSPEs which are chemically pretreated to form surface immobilized oxygenated species that, when their redox behavior is monitored, give a Nernstian response over a large pH range (1–13). An excellent experimental correlation is observed between the voltammetric potential and pH over the entire pH range of 1–13 providing a simple approach with which to monitor solution pH. Such a linear response over this dynamic pH range is not usually expected but rather deviation from linearity is encountered at alkaline pH values; absence of this has previously been attributed to a change in the pKa value of surface immobilized groups from that of solution phase species. This non-deviation, which is observed here in the case of our facile produced reagentless pH sensor and also reported in the literature for pH sensitive compounds immobilized upon carbon electrodes/surfaces, where a linear response is observed over the entire pH range, is explained alternatively for the first time. The performance of the GSPE pH sensor is also directly compared with a glass pH probe and applied to the measurement of pH in “real” unbuffered samples where an excellent correlation between the two protocols is observed validating the proposed GSPE pH sensor. |
URI: | http://hdl.handle.net/10045/53159 |
ISSN: | 0003-2700 (Print) | 1520-6882 (Online) |
DOI: | 10.1021/acs.analchem.5b01236 |
Idioma: | eng |
Tipo: | info:eu-repo/semantics/article |
Derechos: | ACS AuthorChoice - This is an open access article published under an ACS AuthorChoice License, which permits copying and redistribution of the article or any adaptations for non-commercial purposes. |
Revisión científica: | si |
Versión del editor: | http://dx.doi.org/10.1021/acs.analchem.5b01236 |
Aparece en las colecciones: | INV - LEQA - Artículos de Revistas |
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2015_Galdino_etal_AnalChem.pdf | 5,27 MB | Adobe PDF | Abrir Vista previa | |
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