Volume 8, Issue 1 (January 2011)

    New Methodology for pH Measurements in Fuel Ethanol Using Glass Electrode

    (Received 28 May 2010; accepted 28 October 2010)

    Published Online: 2010

    CODEN: JAIOAD

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    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

    Borges, Paulo Paschoal
    Divisão de Metrologia Química, Instituto Nacional de Metrologia, Normalização e Qualidade Industrial (INMETRO), CEP: 25250-020, Rio de Janeiro, Rio de Janeiro

    Fraga, Isabel Cristina Serta
    Divisão de Metrologia Química, Instituto Nacional de Metrologia, Normalização e Qualidade Industrial (INMETRO), CEP: 25250-020, Rio de Janeiro, Rio de Janeiro

    Stradiotto, Nelson Ramos
    Dept. of Analytical Chemistry, Institute of Chemistry, UNESP, Araraquara, São Paolo


    Stock #: JAI103192

    ISSN: 1546-962X

    DOI: 10.1520/JAI103192

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    Author
    Title New Methodology for pH Measurements in Fuel Ethanol Using Glass Electrode
    Symposium , 0000-00-00
    Committee E01