DIN EN ISO 16591:2011-04

This document contains the German translation of the international document ISO 16591:2010 which has been prepared by Technical Committee ISO/TC 28 "Petroleum products and lubricants", the secretariat of which is held by ANSI, in collaboration with Technical Committee CEN/TC 19 "Gaseous and liquid fuels, lubricants and related products of petroleum, synthetic and biological origin".
The responsible German Committee is NA 062-06-70 AA, Spiegelausschuss zu ISO/TC 28 "Mineralölerzeugnisse und Schmierstoffe" (Mirror Committee of ISO/TC 28 "Petroleum products and lubricants") of the Petroleum, Fuels, Lubricants and Related Products Standardization Committee (FAM) at NMP.
This International Standard specifies a method for the determination of the sulfur content by oxidative microcoulometry of petroleum light and middle distillates with a final boiling point not higher than 400 °C. The method can be applied to materials with sulfur contents in the range of 1 mg/kg to 100 mg/kg. Products with sulfur contents above 100 mg/kg can also be analysed after dilution with a suitable sulfur-free solvent. Products with sulfur contents below 1 mg/kg can also be analysed by a modified technique described in Annex A, however, the precision quoted in this standard only applies to measurements in the 1 mg/kg to 100 mg/kg range. Nitrogen interferes with the analysis at concentrations above 0,1 % (m/m), and chlorine interferes at concentrations above 1,0 % (m/m). However, these interferences are overcome by the addition of sodium azide to the cell electrolyte. Bromine and organometallic compounds also interfere with the analysis at concentrations above approximately 500 mg/kg.