BS 7020-4.1(1988) : 1988

National foreword
Committees responsible
Method
1 Scope and field of application
2 References
3 Principle
4 Reagents
5 Apparatus
6 Sampling and samples
7 Procedure
8 Expression of results
9 Test report
Annexes
A Flowsheet of the procedure for the acceptance of
   analytical values for test samples
B Derivation of repeatability and permissible tolerance
   equations
C Precision data obtained by international analytical
   trial
D Decontamination of the waste solutions from the
   analysis
Table
   Total iron contents of the test samples
Figures
1 Least-squares fit of precision against X for total
   iron for the tin (II) chloride reduction method
2 Least-squares fit of precision against X for total
   iron for the hydrogen sulfide reduction method
3 Apparatus for the removal of mercury from waste
   solutions

Gives two titrimetric methods for determining total iron content in iron ores using potassium dichromate after reduction of the trivalent iron by tin, chloride or hydrogen sulfide. Applicable to a concentration range of 30 to 72% of iron in natural iron ores, and iron ore concentrates and agglomerates including sinter products. For an unknown ore, it is recommended that the iron content be determined by both methods to check that the tin chloride reduction method is satisfactory. Covers references, principle, reagents, apparatus, sampling and samples, procedure, expression of results and test report. Includes four annexes.