ISO 4284:1993
Acid-grade and ceramic-grade fluorspar; determination of sulfide content; iodometric method
- Standard No.
- ISO 4284:1993
- Release Date
- 1993
- Published By
- International Organization for Standardization (ISO)
- Status
- Latest
- ISO 4284:1993
- Scope
- 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.
ISO 4284:1993 history
- 1993 ISO 4284:1993 Acid-grade and ceramic-grade fluorspar; determination of sulfide content; iodometric method
- 1988 ISO 4284:1988 Acid-grade and ceramic-grade fluorspar — Determination of sulfide content — Iodometric method
- 1978 ISO 4284:1978 Acid-grade fluorspar — Determination of sulphide content — Iodometric method
