Active standard | Published: 01/02/1976

ISO 1690:1976

Sodium and potassium silicates for industrial use — Determination of silica content — Gravimetric method by insolubilization
(Silicates de sodium et de potassium a usage industriel — Dosage de la silice — Méthode gravimétrique par insolubilisation)

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Detail information

Designation: ISO 1690:1976

Publication date: 01/02/1976

Pages: 3

Country: International technical standard

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Anotation

Description / Abstract: 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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