ISO 1691:1976
Current
The latest, up-to-date edition.
Sodium and potassium silicates for industrial use — Determination of carbonates content — Gas-volumetric method
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English, French
01-07-1976
Three cases, defined by a preliminary test, are envisaged: silicates containing neither sulphides nor chlorates; silicates containing sulphides; silicates containing chlorates. The method based on boiling of an acidified test portion containing methyl orange and with a lead paper strip in the vapour. The presence of sulphides produces blackening of the paper and the presence of chlorates decolorizes the methyl orange. Volumetric*measurement of carbon dioxide evolved from silicates containing neither sulphides nor chlorates by reaction with a hydrochloric acid solution. The principle for the oxidation of sulphides and the reduction of chlorates are specified.
| Committee |
ISO/TC 47
|
| DevelopmentNote |
Also numbered as BS 6092-4(1981) (09/2005)
|
| DocumentType |
Standard
|
| Pages |
5
|
| PublisherName |
International Organization for Standardization
|
| Status |
Current
|
| Standards | Relationship |
| NBN T 03 236 : 1980 | Identical |
| SS-ISO 1691:1993 | Identical |
| UNE 55626:1983 | Identical |
| PN ISO 1691 : 2000 | Identical |
| DEFSTAN 68-209/2(2009) : 2009 | FRENCH CHALK |
| ISO 1689:1976 | Sodium and potassium silicates for industrial use — Calculation of the ratio : silicon dioxide/sodium oxide or silicon dioxide/potassium oxide |
| 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 |
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