BS 3903:1977

Foreword
Cooperating organizations
Methods
Section one. General
1. Scope
2. References
Section two. Methods of test for acids containing up
to 100% of H2SO4
3. Determination of sulphuric acid content
4. Determination of residue on heating
5. Determination of sulphur dioxide content
6. Determination of arsenic content
7. Determination of ammoniacal nitrogen content
8. Determination of nitrogen oxides content
9. Determination of chloride content
10. Determination of iron and lead contents by atomic
    absorption spectroscopy
11. Determination of iron content
12. Determination of lead content
Section three. Methods of test for oleums and liquid
sulphur trioxide
13. Sampling of oleums
14. Dilution of oleums and liquid sulphur trioxide for
    analysis
15. Determination of residue on heating of oleumns and
    liquid sulphur trioxide
16. Determination of total acidity and calculation of
    free sulphur trioxide content on oleums
Tables
1. Selection of reagent solutions and test portion
2. Worked example of the calibration of silver nitrate
    solution
Figures
1. Apparatus for determination of sulphur dioxide
    content
2. Apparatus for determination of ammoniacal nitrogen
    content
3. Distillation apparatus for determination of nitrogen
    oxides content
4. Apparatus for use in determination of chloride
    content
5. Sampling cage: sampling of oleums
6. Dilution apparatus for oleums and liquid sulphur
    trioxide

Methods for acids up to 100 per cent H₂SO₄ for sampling oleums and for diluting and testing oleums and liquid sulphur trioxide.

This British Standard specifies methods of test for commercial sulphuric acid, oleum and liquid sulpur trioxide. Section 2 covers tests for acids containing up to 100 % of H₂SO₄. Section 3 describes methods of test for oleums and liquid sulphur trioxide and includes a method for their dilution prior to analysis by the methods specified in section 2, clauses 5 to 9.