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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 is 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 is performed 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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