BS 2000-373(2010) : 2010

Foreword
1 Scope
2 Normative references
3 Principle
4 Reagents and materials
5 Apparatus
6 Samples and sampling
7 Apparatus preparation
8 Apparatus verification and calibration curve
   construction
9 Procedure
10 Calculation
11 Expression of results
12 Precision
13 Test report
Annex A (informative) - Determination of sulfur
        contents below 1 mg/kg - Standby technique
Annex B (informative) - Troubleshooting
Annex C (informative) - Calculation of sulfur
        content from electrochemical data
Bibliography

Describes 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 degree C. Applies 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 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. The precision quoted 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), but 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.