Reference number
ISO 1232:1976
© ISO 2025
ISO 1232:1976
Aluminium oxide primarily used for the production of aluminium — Determination of silica content — Reduced molybdosilicate spectrophotometric method
Edition 1
1976-09
Withdrawn
Withdrawn (Edition 1, 1976)

Abstract

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.

General information

  • Status
     : Withdrawn
    Publication date
     : 1976-09
    Stage
    : Withdrawal of International Standard [95.99]
  • Edition
     : 1
    Number of pages
     : 5
  • Technical Committee :
    ISO/TC 226
    ICS :
    71.100.10 
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