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Validation of a New Analytical Method for the Measurement of Free Fatty Acids in Biodiesel
Author(s) -
da Silva Figueiredo Elizabeth,
de Castro Vieira Eduardo,
de Siqueira Cavalcanti Eduardo Homem,
D'Elia Eliane
Publication year - 2013
Publication title -
electroanalysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.574
H-Index - 128
eISSN - 1521-4109
pISSN - 1040-0397
DOI - 10.1002/elan.201200513
Subject(s) - biodiesel , potentiometric titration , titration , fatty acid , chemistry , electroanalytical method , electrochemistry , electrode , organic chemistry , catalysis
Abstract International and Brazilian standards have in common the acid number as the main qualification parameter for biodiesel. Free fatty acids lead to engine corrosion and contribute to the formation of gum. The analytical methods specified for analysis are based on colorimetric and potentiometric titrations, which are characterised by lack of selectivity. This article proposes a new method based on the electrochemical reduction of quinones in the presence of the free fatty acids found in biodiesel on the glassy carbon electrode surface in the range of 0.4 V to −0.65 V versus Ag/AgCl/Cl − (3 mol L −1 ). The proposed method was validated.