Volume 7, Issue 2 (February 2010)

    Water Content Determination in Biodiesel: Optimization of Methodology in Coulometric Karl Fischer Titration

    (Received 12 June 2009; accepted 13 November 2009)

    Published Online: 2009

    CODEN: JAIOAD

      Format Pages Price  
    PDF 7 $25   ADD TO CART


    Abstract

    Coulometric Karl Fischer (KF) titration is a highly accurate technique employed for moisture determination in non-aqueous solvents. Methodology for coulometric titration in a KF apparatus coupled to an autosampler oven was optimized in order to improve the accuracy of moisture determination in biodiesel derived from soybean. Several parameters were investigated, and three of them were optimized according to a central composite 23 star experimental design. The highest accuracy for moisture determinations corresponded to a relative standard deviation of 1.48 %. It was reached when the KF titrator was operated with electrode without diaphragm, the sample mass was 4 g, and the oven temperature was set to 170°C. Other parameters, like carrier gas flux and extraction time, presented minimal or no effects for improving the accuracy of moisture determination.


    Author Information:

    Vicentim, M. P.
    Laboratório de Análise Orgânica, Divisão de Metrologia Química, DIMCI/INMETRO, 50 Prédio 6, Xerém, Duque de Caxias, Rio de Janeiro

    Barreto Sousa, M. V.
    Laboratório de Análise Orgânica, Divisão de Metrologia Química, DIMCI/INMETRO, 50 Prédio 6, Xerém, Duque de Caxias, Rio de Janeiro

    Fernandes da Silva, V.
    Laboratório de Análise Orgânica, Divisão de Metrologia Química, DIMCI/INMETRO, 50 Prédio 6, Xerém, Duque de Caxias, Rio de Janeiro

    Mateus, V. Lionel
    Laboratório de Análise Orgânica, Divisão de Metrologia Química, DIMCI/INMETRO, 50 Prédio 6, Xerém, Duque de Caxias, Rio de Janeiro

    Rodrigues, J. M.
    Laboratório de Análise Orgânica, Divisão de Metrologia Química, DIMCI/INMETRO, 50 Prédio 6, Xerém, Duque de Caxias, Rio de Janeiro

    Smarçaro da Cunha, V.
    Laboratório de Análise Orgânica, Divisão de Metrologia Química, DIMCI/INMETRO, 50 Prédio 6, Xerém, Duque de Caxias, Rio de Janeiro


    Stock #: JAI102615

    ISSN: 1546-962X

    DOI: 10.1520/JAI102615

    ASTM International is a member of CrossRef.

    Author
    Title Water Content Determination in Biodiesel: Optimization of Methodology in Coulometric Karl Fischer Titration
    Symposium , 0000-00-00
    Committee D02