ISO-1690 › Sodium and potassium silicates for industrial use -- Determination of silica content -- Gravimetric method by insolubilization
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The procedure is based on evaporation to dryness of a test portion previously acidified with hydrochloric acid. Dissolution of the soluble salts, filtration and washing of the insoluble matter. Second evaporation of the filtrate and washings under the same conditions, further dissolution of the soluble salts, filtration and washing. Calcination and weighing of the two lots of insoluble matter simultaneously. Volatilization of silica by heating with hydrofluoric and sulphuric acids and weighing of the residue after calcination. The*difference in mass represents the silica present in the test portion.
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Document Number
ISO 1690:1976
Revision Level
1ST EDITION
Status
Current
Publication Date
Feb. 15, 1976
Committee Number
ISO TC 47