Aktivní norma | Vydána: 01.07.1976

ISO 1691:1976

Sodium and potassium silicates for industrial use — Determination of carbonates content — Gas-volumetric method
(Silicates de sodium et de potassium a usage industriel — Dosage des carbonates — Méthode gazométrique)

Dostupné jazyky: Anglicky, Francouzsky

Dostupné provedení: Elektronické PDF, Tištěné

od 1 385.10 CZK zobrazit na eshopu

Podrobné informace

Označení: ISO 1691:1976

Datum vydání: 01.07.1976

Stran: 5

Země: Mezinárodní technická norma

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Anotace

Description / Abstract: 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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