Petroleum products - Determination of sulfur content - Wavelength-dispersive X-ray fluorescence spectrometry (ISO 14596:2007); English version of DIN EN ISO 14596:2007-12
This International Standard specifies a method for the determination of the sulfur content of liquid petroleum
products, additives for petroleum products, and semi-solid and solid petroleum products that are either
liquefied by moderate heating or soluble in organic solvents (see 4.1) of negligible or accurately known sulfur
content. The method is applicable to products or additives having sulfur contents in the range 0,001% (m/m)
to 2,50 % (m/m); higher contents can be determined by appropriate dilution. Other elements do not interfere at
concentrations anticipated in the materials subject to this analysis. O
NOTE For the purposes of this International Standard, the term "% (mhn)" is used to represent the mass fraction of a
material.
High concentrations of phosphorus or chlorine [typically above 3 % (m/m)] can cause bias in the sulfur result
by absorbing Zr-Lα and S-Kα to different extents. It is necessary in these cases to carry out studies to
determine whether this potential interference is significant.
When larger amounts of molybdenum are present (typically above 50 mg/kg to 100 mg/kg), increased
background radiation and spectral overlap with the sulfur signal can occur. It is necessary in these cases to
inspect the relevant spectral regions, for example, to investigate the significance of this potential source of
bias.