Sodium and potassium silicates for industrial use — Determination of silica content — Gravimetric method by insolubilization

Available format(s)

Hardcopy , PDF 1 User , PDF 3 Users , PDF 5 Users , PDF 9 Users

Language(s)

English, French

Published date

01-02-1976

Publisher

International Organization for Standardization

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.

Committee	ISO/TC 47
DevelopmentNote	Also numbered as BS 6092-3(1981) (09/2005)
DocumentType	Standard
Pages	3
PublisherName	International Organization for Standardization
Status	Current

Standards	Relationship
UNE 55625:1982	Identical
NBN T 03 235 : 1980	Identical
NBN EN 1209 : 2004	Identical
PN ISO 1690 : 2000	Identical

EN 1209:2003	Chemicals used for treatment of water intended for human consumption - Sodium silicate
DIN EN 1209:2004-03	Chemicals used for treatment of water intended for human consumption - Sodium silicate
ISO 1692:1976	Sodium and potassium silicates for industrial use — Determination of total alkalinity — Titrimetric method
ISO 2122:1972	Sodium and potassium silicates for industrial use — Preparation of solution of products not easily soluble in boiling water and determination of matter insoluble in water
ISO 1689:1976	Sodium and potassium silicates for industrial use — Calculation of the ratio : silicon dioxide/sodium oxide or silicon dioxide/potassium oxide
BS EN 1209:2003	Chemicals used for treatment of water intended for human consumption. Sodium silicate