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

Buy this standard

	Format	Language
std 1 40	PDF
std 2 40	Paper

CHF40

Life cycle

Now

Published

ISO 1691:1976

A standard is reviewed every 5 years
Stage: 90.60 (Under review)

Got a question?

Check out our FAQs

Customer care

+41 22 749 08 88

customerservice@iso.org

Opening hours:
Monday to Friday - 09:00-12:00, 14:00-17:00 (UTC+1)