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ISO 4284:1993

Withdrawn
Withdrawn

A Withdrawn Standard is one, which is removed from sale, and its unique number can no longer be used. The Standard can be withdrawn and not replaced, or it can be withdrawn and replaced by a Standard with a different number.

Acid-grade and ceramic-grade fluorspar Determination of sulfide content Iodometric method
Available format(s)

Hardcopy , PDF , PDF 3 Users , PDF 5 Users , PDF 9 Users

Withdrawn date

02-14-2019

Language(s)

English, French

Published date

01-21-1993

The principle of the method specified is digestion of a test portion in a sealed apparatus in a mixture of hydrochloric acid, tin(II) chloride and boric acid solutions, absorption of the liberated hydrogen sulfide, entrained in a stream of oxygen-free argon or nitrogen, in zinc acetate solution and iodometric determination of the zinc sulfide formed. The method is applicable to products having a sulfide content equal to or greater than 0,001 % (m/m). It is not applicable, if presence of polysulfides is suspected.

DocumentType
Standard
Pages
4
PublisherName
International Organization for Standardization
Status
Withdrawn
Supersedes

Standards Relationship
NBN T 03 544 : 1983 Identical
BS 5659-3:1989 Identical
BS 5659-3:1979 Identical

ISO 565:1990 Test sieves — Metal wire cloth, perforated metal plate and electroformed sheet — Nominal sizes of openings

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