Heavy fractions, as thick as molasses, are not only difficult to transport and handle, but also require advanced strategies for the compulsory quality control. For such matrices especially the nitrogen content is of interest due to its negative effects on the refining process (e.g. by poisoning of catalysts, unwanted side products etc.). The typical boiling points of above 400 °C and relatively high nitrogen content exceeding 0.5 wt-% make the investigation of these materials non-trivial. A dilution step before analysis to decrease the extremely high nitrogen content is often applied for small improvement, but it cannot eliminate this effect. An additional optimization of the digestion process is required to maximize the recovery up to ratios between 95 – 100 %. For this purpose we have developed the O2+ parameter mode.
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