Abstract Determination of electric properties at the different steps of biodiesel (BD) production contributes to a better understanding of the influence of the variables. Measurements of complex permittivity and conductivity make possible to survey efficiently the diverse steps of the industrial-scale production process, from the conditioning of the raw material to the quality control of the final product. Moreover, electrical measurements are “non-destructive” and require relatively small sample volumes. In this work, complex permittivity spectra of BD and DF from 20 Hz to 20 MHz are presented. Experimental data were taken in a range of temperatures from 25 to 75 °C, measured with an accuracy of ± 0.1 ∘ C . The measuring system used in this work requires a sample volume of 25 cm 3 and gives the real part of permittivity ( e ′ ) with an accuracy better than 1%. Dielectric loss ( tg δ ) can be measured between 10 - 2 and 10 2 .
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