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ISO 1691:1976

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

Jul 1, 1976

General information

90.93     Oct 20, 2023

ISO

ISO/TC 47

International Standard

71.060.50  

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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
90.93 Standard confirmed
Oct 20, 2023

National adoptions

SRPS ISO 1691:2014  
ISS

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

90.93   Standard confirmed

H047 more

SRPS H.B8.318:1977  
ISS

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

95.99   Withdrawal of Standard

H047 more