- Method ASTM D5863
- Repeatability 1.1X0.50
- Reproducibility 0.33X0.90
- Blending linear
- Additive Correction No
Used to determine nickel, vanadium, iron, and sodium in crude oils and residual fuels by flame
atomic absorption spectrometry (AAS). Two different test methods are presented. The first uses acid to decompose the sample before diluting it up in water based solution to run on the AAS. The second method uses organic dilution. The sample is diluted with a xylene or kerosene solvent and then run on the AAS. Both methods will give similar results but can vary depending upon the amount of sediment in the sample and the final dilution performed.
The metals listed above are significant due to the following. When they are combusted in and engine they can form corrosive compounds with low melting points. These trace metals can also deactivate catalysts during the refining process which will result in downtime and expense to reactivate or replace them.