Sodium and potassium silicates for industrial use -- Determination of carbonates content -- Gas-volumetric method
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.
| SDO | ISO: International Organization for Standardization |
| Document Number | ISO 1691 |
| Publication Date | July 15, 1976 |
| Language | en - English |
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| Supercedes | |
| Committee | ISO TC 47 |
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