ISO-1232 › Aluminium oxide primarily used for the production of aluminium -- Determination of silica content -- Reduced molybdosilicate spectrophotometric method
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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.
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71.100.10 (Materials for aluminium production)
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Document Number
ISO 1232:1976
Revision Level
1ST EDITION
Status
Superseded
Publication Date
Sept. 15, 1976
Committee Number
ISO TC 47/SC 7