Metals determination in petroleum and petroleum products


Metals determination in petroleum and petroleum products

There are several purposes of metal determination in petroleum and petroleum products. Among them there is environment monitoring, mining, fuel quality monitoring, oil refinery control, etc.
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X-ray fluorescence (XRF) method provides metal content determination from Mg to U in petroleum and petroleum products. There are problems that are solved with XRFA most often.

1.     Ni, V determination in oil, marine fuel, residual fuel oil, mazut
Oil can contain Ni, V in concentration suitable for their extraction. Ratio of these elements is used as an indicator for the oil deposit. Both elements can poison catalysts at refinery, so their concentration shall be thoroughly controlled.

Marine fuel ash containing vanadium compounds may lead to high temperature corrosion.
Metals containing in residual fuel oil used at Power plants can be accumulated in ash and lead to environment pollution.

2.   Pb, Fe, Mn  determination in motor fuel 
Automobile fuel shall not contain metal containing additives.

3.    Lead determination in aviation benzene
Though lead tetraethyl is permitted for aviation benzene, its concentration shall be controlled.

4.    Ca, P, Zn determination in marine fuel.
 Ca, P, Zn content in marine fuel indicates that waste oil was added to it, that is prohibited by ISO 8217:2010.

The procedure of analysis is simple and similar for all tasks. 20 cm3 of the test material is required for analysis (two concurrent measurements) including reserve amount. Viscous products shall be liquefied either by heating or by dilution with mineral oil.
The test material is filled in the sample cups and put in spectrometer. Analysis is carried out automatically according to the program, metal content calculation is run with preliminary obtained calibration curve. If the sample was diluted then the result is multiplied by the corresponding coefficient.

Wavelength dispersive X-ray fluorescent WDXRF scanning spectrometer for determination of chemical elements in the range from Ca (Calcium) to U (Uranium) in various compounds.

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:SPECTROSCAN МАКС-GF1(2)E" is a modification of WDXRF  "SPECTROSCAN МАКС-G" spectrometer with one or two additional EDXRF channels.

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"SPECTROSCAN MAKC-GVM" WDXRF spectrometer determines elements from Na (Sodium) to U (Uranium) in solids, liquids or powders, in solutions and thin films, deposits on filters. 

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