Atomic spectrometric determination of vanadium in oils using different sample pretreatment methods

A bomb calorimeter was modified for the pretreatment of oil and other organ ic samples that can be digested with difficulty for analysing their metal c ontents. In the case of digestion of these sample types, the efficiencies o f ashing, microwave digestion and burning in bomb calorimeter were compared . These sample pretreatment methods were considered from the point of view of the extraction and determination of vanadium. The total vanadium, V-IV a nd V-V concentrations were studied in ashes obtained by burning oils at dif ferent temperatures.