ISO 9061:1993
Acid-grade and ceramic-grade fluorspar; determination of iron content; 1,10-phenanthroline spectrometric method
- Standard No.
- ISO 9061:1993
- Release Date
- 1993
- Published By
- International Organization for Standardization (ISO)
- Status
- Latest
- ISO 9061:1993
- Scope
- The method specified is based on alkaline fusion of a test portion with a mixture of sodium carbonate and boric acid, dissolution of the melt in excess hydrochloric acid, reduction of the iron(III) with hydroxylammonium chloride, formation of the iron(II)-1,10-phenanthroline complex in a buffered medium (pH between 3 and 5), spectrometric measurement of the absorbance of the coloured complex at a wavelength of about 510 nm, corresponding to the absorption maximum. Applies to products having iron contents, expressed as Fe2O3, in the range 0,1 % (m/m) to 2,0 % (m/m).
ISO 9061:1993 history
- 1993 ISO 9061:1993 Acid-grade and ceramic-grade fluorspar; determination of iron content; 1,10-phenanthroline spectrometric method
- 1988 ISO 9061:1988 Acid-grade and ceramic-grade fluorspar — Determination of iron content — 1,10-Phenanthroline spectrometric method
