Journal Published Online: 14 December 2010
Volume 8, Issue 1

New Methodology for H Measurements in Fuel Ethanol Using Glass Electrode

CODEN: JAIOAD

Abstract

Studies 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.

Author Information

Moutinho da Silva, Ricardo
Dept. of Analytical Chemistry, Institute of Chemistry, UNESP, Araraquara, São Paolo, Brazil
Borges, Paulo
Divisão de Metrologia Química, Instituto Nacional de Metrologia, Normalização e Qualidade Industrial (INMETRO), CEP: 25250-020, Rio de Janeiro, Rio de Janeiro, Brazil
Fraga, Isabel
Divisão de Metrologia Química, Instituto Nacional de Metrologia, Normalização e Qualidade Industrial (INMETRO), CEP: 25250-020, Rio de Janeiro, Rio de Janeiro, Brazil
Stradiotto, Nelson
Dept. of Analytical Chemistry, Institute of Chemistry, UNESP, Araraquara, São Paolo, Brazil
Pages: 9
Price: $25.00
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Details
Stock #: JAI103192
ISSN: 1546-962X
DOI: 10.1520/JAI103192