Methoden zum Nachweis von Ruß in Dieselöl.

Methods of detecting soot in diesel oil. Minilabs Spectro Scientific

This article will show the best method for detecting soot in diesel oil today. There are several well-known techniques for detecting the presence of soot in diesel oil. The most convenient analysis, which has the lowest cost, is an analysis using an infrared spectrometer, for example, the 1100 IR analyzer, which forms the basis of modern Minilab series oil analysis laboratories. Using this technique, more than a dozen oil parameters can be measured simultaneously. It should be replaced that some of them are determined more reliably than others, which depends on the susceptibility to interference in the wavelength region of interest. Although data collection by the IR spectral method is relatively simple, there are problems with the accuracy of the measurement, especially with increasing particle size of soot and the ingress of contaminants such as dirt. The maximum detection limit by IR spectroscopy can be from 1.5 to 5 percent, due to the fact that the critical limits of the measured values by this method for engines with exhaust gas recirculation can be 8 percent, and other systems about 5 percent.
Alternatives to this method are thermogravimetric analysis and a pentane insolubility test. The pentane insolubility test consists in separating insoluble substances from oil using a specially selected solvent after adding it to the oil. The solvent, as a rule, is pentane, and sometimes toluene. Insoluble substances are separated from the mixture by centrifugation or by filtration on a filter membrane. Although this is a fairly simple method with a lower cost than IR spectroscopy, it becomes difficult to apply when other insoluble inclusions are present in the oil, since they will be measured together.
Thermogravimetric analysis is able to give the most accurate measurements of the soot content in the test oil. However, it is quite long.

Impressum des Anbieters