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ISO 1232:1976

Aluminium oxide primarily used for the production of aluminium — Determination of silica content — Reduced molybdosilicate spectrophotometric method

Sep 1, 1976
95.99   Withdrawal of Standard   Feb 4, 2016

General information

95.99     Feb 4, 2016

ISO

ISO/TC 226

International Standard

71.100.10  

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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.

Life cycle

NOW

WITHDRAWN
ISO 1232:1976
95.99 Withdrawal of Standard
Feb 4, 2016

National adoptions

SRPS H.B8.604:1979  
ISS

Aluminium oxide primarily used for the production of aluminium — Determination of silica content — Reduced molybdosilicate spectrophotometric method

95.99   Withdrawal of Standard

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