This International Standard specifies a method for the determination of the sulphur 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 sulphur content. The method is applicable to products or additives having sulphur contents in the range 0,001 % (m/m) to 2,50 % (m/m); higher contents may be determined by appropriate dilution. Other elements do not interfere at concentrations anticipated in the materials subject to this analysis.
NOTE 1 For the purposes of this International Standard, the term "% (m/m)" is used to represent the mass fraction of a material.
NOTE 2 High concentrations of phosphorus may cause bias in the sulfur result by absorbing Zr-L? and S-K? to different extents. Studies should be carried out in these cases to determine whether this potential interference is significant.
NOTE 3 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. In these cases, inspection of the relevant spectral regions, for example, should be carried out to investigate the significance of this potential source of bias.