BS 4993-3:1974

This standard BS 4993-3:1974 Methods of test for aluminium fluoride for industrial use is classified in these ICS categories:

• 71.060.50 Salts

This Part of BS 4993 specifies a spectrophotometric method for the determination of the silica content of aluminium fluoride for industrial use.

NOTE The titles of the British Standards referred to in this standard are listed on the inside back cover.

Fusion of a test portion with sodium carbonate/boric acid, dissolution of the melt in nitric acid, formation of the yellow (oxidized) silico-molybdic complex, reduction to the blue form and spectrophotometric measurement at 815 nm.