ISO 1691:1976

This standard was last reviewed and confirmed in 2018. Therefore this version remains current.

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.

General information

Status
: Published

Publication date
: 1976-07
Edition
: 1

Number of pages
: 5
Technical Committee
: ISO/TC 47 Chemistry
ICS
:
71.060.50 Salts

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std 1 38	PDF
std 2 38	Paper

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ISO 1691:1976

A standard is reviewed every 5 years
Stage: 90.93 (Confirmed)

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