BS EN 14112 Fat and oil derivatives - Fatty Acid Methyl Esters (FAME) - Determination of oxidation stability (accelerated oxidation test)
1 Scope
This European Standard specifies a method for the determination of the oxidation stability of fatty acid methyl esters (FAME) at 110 °C.
2 Terms and definitions
For the purposes of this European Standard, the following terms and definitions apply.
2.1 induction period
time which passes between the moment when the measurement is started and the moment when the formation of oxidation products rapidly begins to increase.
2.2 oxidation stability
induction period determined according to the procedure specified in this European Standard. Oxidation stability is expressed in hours.
3 Principle
A stream of purified air is passed through the sample which has been brought to a specified temperature. The vapours released during the oxidation process, together with the air, are passed into a flask containing water which has been demineralized or distilled and contains an electrode for measuring the conductivity. The electrode is connected to a measuring and recording device. It indicates the end of the induction period when the conductivity begins to increase rapidly. This accelerated increase is caused by the dissociation of volatile carboxylic acids produced during the oxidation process and absorbed in the water.
