ISO 1690:1976
Current
The latest, up-to-date edition.
Sodium and potassium silicates for industrial use — Determination of silica content — Gravimetric method by insolubilization
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English, French
01-02-1976
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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.
| 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; German version EN 1209:2003 |
| 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 |
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