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A method for the determination of polyunsaturated fatty acid methyl esters in biodiesel: Results of an interlaboratory study

✍ Scribed by Sigurd Schober; Ingrid Seidl; Andreas Meinitzer; Martin Mittelbach

Publisher
John Wiley and Sons
Year
2009
Tongue
English
Weight
312 KB
Volume
111
Category
Article
ISSN
1438-7697

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✦ Synopsis

Abstract

A gas chromatographic method for the determination of fatty acid methyl esters with four or more double bonds in biodiesel was developed and tested. The method is based on gas chromatographic separation on a wax capillary column using methyl tricosanoate as internal standard. The performance of the method was proved with the participation of 11β€…European laboratories by a Round Robin test on six different biodiesel samples containing different amounts of polyunsaturated fatty acid methyl esters. The results showed that the precision is sufficient around the ENβ€…14214 limit of 1β€…% (m/m). At lower concentrations the variation is too high. The scope of the application can be given between as 0.6 and 1.5%.

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## Abstract Three different calibration curves based on ^1^H‐NMR spectroscopy (300 MHz) were used for quantifying the reaction yield during biodiesel synthesis by esterification of fatty acids mixtures and methanol. For this purpose, the integrated intensities of the hydrogens of the ester methoxy