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BS 4993-3:1974
M00000196
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BS 4993-3:1974 Methods of test for aluminium fluoride for industrial use. Determination of silica content
standard by BSI Group, 02/28/1974
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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.Cross References:
BS 1792
BS 2586
BS 3145
BS 3422