ISO 4284:1993
Withdrawn
Acid-grade and ceramic-grade fluorspar — Determination of sulfide content — Iodometric method
Hardcopy , PDF
English, French
01-21-1993
02-14-2019
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.
| Committee |
ISO/TC 175
|
| 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Withdrawn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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