ISO 4284:1993
Withdrawn
A Withdrawn Standard is one, which is removed from sale, and its unique number can no longer be used. The Standard can be withdrawn and not replaced, or it can be withdrawn and replaced by a Standard with a different number.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
Hardcopy , PDF , PDF 3 Users , PDF 5 Users , PDF 9 Users
14-02-2019
English, French
21-01-1993
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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Withdrawn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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