ISO-1691 › Sodium and potassium silicates for industrial use -- Determination of carbonates content -- Gas-volumetric method
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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.
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Document Number
ISO 1691:1976
Revision Level
1ST EDITION
Status
Current
Publication Date
July 15, 1976
Committee Number
ISO TC 47