ISO 1691:1976

Sodium and potassium silicates for industrial use — Determination of carbonates content — Gas-volumetric method

Publication date: Jul 1, 1976

General information

Current stage: 90.20 Effective date: Jan 15, 2023

Originator: ISO

Owner: ISO/TC 47

Type: International Standard

ICS: 71.060.50

Languages: French English

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Status: Published

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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.

Life cycle

NOW

PUBLISHED
ISO 1691:1976
90.20 Standard under periodical review
Jan 15, 2023

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