The New Biodiesel Rancimat 873

Determining the oxidation stability of biodiesel according to EN 14112. The oxidation stability of biodiesel can easily be determined with the
873 Biodiesel Rancimat from Metrohm, a modern and reliable instrument with a 3 years’ warranty. In addition to reliable hardware and easy
operation, it offers all the comfort to be expected from a PC-controlled instrument.

The method: oxidation stability according to EN 14112

The determination of the oxidation stability according to EN 14112 is an accelerated oxidation test. The sample is held in a sealed reaction tube at a constant temperature of 110 °C while a continuous flow of air is passed through the sample. The fatty acid methyl esters (FAME) in the sample are oxidised to peroxides as the primary oxidation products. After some time, the fatty acids are completely decomposed, forming the secondary oxidation products. In addition to volatile organic compounds, these are low molecular organic acids, mainly formic and acetic acids. An air flow transports them to a measuring vessel containing distilled water as the absorption solution. Its conductivity is recorded continuously; as soon as volatile carboxylic acids are formed in the sample, this is indicated by an increase in conductivity. The time that elapses until the secondary oxidation products are detected is known as the induction time and is a measure of the oxidation stability of the sample.

The measuring setup
The 873 Biodiesel Rancimat has two independent heating blocks allowing a total of eight samples to be analysed simultaneously. Each measuring position can be started individually. As soon as the measurement has been completed, the measuring position is immediately ready for a new sample, which means that the instrument can be used to its full capacity. The simple and well laid-out design of the instrument helps you to keep the overview even when handling a large number of samples.