ISO 1232:1976
Aluminium oxide primarily used for the production of aluminium; Determination of silica content; Reduced molybdosilicate spectrophotometric method
- Standard No.
- ISO 1232:1976
- Release Date
- 1976
- Published By
- International Organization for Standardization (ISO)
- Latest
- ISO 1232:1976
- Scope
- The method is applicable to products having a silica content between 0.005 % (m/m) and 0.025 % (m/m) provided that the content of phosphorus pentoxide plus vanadium pentoxide does not exceed 0.02 % (m/m). The principle of the method is based on the formation of oxidized molybdosilicate (yellow) under well-defined conditions of acidity, concentration of reagents, temperature and time. Selective reduction of the complex in a highly acidic medium of sulphuric acid and in the presence of tartaric acid. Spectrophotometric measurement of the reduced coloured complex at a wavelength of about 815 nm. - Replaces ISO Recommendation R 1232-1970.
ISO 1232:1976 history
- 1976 ISO 1232:1976 Aluminium oxide primarily used for the production of aluminium; Determination of silica content; Reduced molybdosilicate spectrophotometric method
