ISO 1691:1976
Sodium and potassium silicates for industrial use; Determination of carbonates content; Gas-volumetric method
- Standard No.
- ISO 1691:1976
- Release Date
- 1976
- Published By
- International Organization for Standardization (ISO)
- Latest
- ISO 1691:1976
- Scope
- 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.
ISO 1691:1976 history
- 1976 ISO 1691:1976 Sodium and potassium silicates for industrial use; Determination of carbonates content; Gas-volumetric method
