BS 6200-3.28.3:1995

Committees responsible
National foreword
1 Scope
2 Normative references
3 Principle
4 Reagents
5 Apparatus
6 Sampling
7 Procedure
8 Expression of results
9 Special case
10 Notes on procedure
11 Test report
Annexes
A (informative) Additional information on the
   international cooperative tests
B (informative) Graphical representation of precision
   data
Figures
1 Example of an apparatus for purification of the
   reducing mixture
2 Example of an apparatus for reduction and
   distillation
B.1 Logarithmic relationship between sulfur content
     (ws) and repeatability (r) or reproducibility
     (R and Rw)

Applicable to sulphur content of between 0.0003% (m/m) and 0.010% (m/m) depending upon the niobium, silicon, tantalum and titanium content.

This International Standard specifies a methylene blue spectrophotometric method for the determination of sulfur in steel and iron. The method is applicable to sulfur contents between 0,000 3 % (m/m) and 0,010 % (m/m). However, niobium, silicon, tantalum and titanium interfere in the determination of sulfur. Depending on the concentration of the interfering elements, the application ranges and test portion masses given in Table 1 apply. Table 1 Maximum allowable content of the interfering elements Test portion Application ranges Δws % (m/m) % (m/m) Nb Si Ta Ti g 0,5 1,0 0,3 1,0 1,0 0,000 3 to 0,001 0 1,0 2,0 0,6 2,0 0,50 0,001 0 to 0,010