ISO 1232:1976

Withdrawn

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

Available format(s)

Hardcopy , PDF , PDF 3 Users , PDF 5 Users , PDF 9 Users

Withdrawn date

28-09-2018

Language(s)

English, French

Published date

01-09-1976

Publisher

International Organization for Standardization

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.

DevelopmentNote	Also numbered as BS 4140-5(1986) (07/2005)
DocumentType	Standard
Pages	5
PublisherName	International Organization for Standardization
Status	Withdrawn

Standards	Relationship
NBN T 03 410 : 1983	Identical

BS 4140-8:1986	Methods of test for aluminium oxide Determination of absolute density using a pyknometer
BS 4140-6:1980	Methods of test for aluminium oxide Determination of titanium content
BS 4140-9:1986	Methods of test for aluminium oxide Measurement of the angle of repose
BS 4140-16:1986	Methods of test for aluminium oxide Determination of zinc content by flame atomic absorption
BS 4140-1:1986	Methods of test for aluminium oxide Preparation and storage of test samples
BS 4140-13:1986	Methods of test for aluminium oxide Preparation of sample solution by treatment with hydrochloric acid under pressure
BS 4140-7:1986	Methods of test for aluminium oxide Determination of iron content
BS 4140-22:1980	Methods of test for aluminium oxide Determination of manganese content
BS 4140-12:1986	Methods of test for aluminium oxide Determination of vanadium content
BS 4140-11:1986	Methods of test for aluminium oxide Determination of sodium content
BS 4140-10:1986	Methods of test for aluminium oxide Determination of untamped density