ISO 1691:1976
Sodium and potassium silicates for industrial use — Determination of carbonates content — Gas-volumetric method
OVERVIEW
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.
COMMENTS
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PRODUCT DETAILS
| Status | Current |
|---|---|
| Edition | 1976 |
| No. of Pages | 5 |
| ICS Classification | 71.060.50 Salts |
| Committee | ISO/TC 47 |
| Available for Purchase | For sale in Singapore only |
| Adoption | ISO |