Reference number
ISO 4284:1993
© ISO 2024
ISO 4284:1993
Acid-grade and ceramic-grade fluorspar — Determination of sulfide content — Iodometric method
Edition 3
1993-01
Withdrawn
Withdrawn (Edition 3, 1993)

Abstract

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.

General information

  • Status
     : Withdrawn
    Publication date
     : 1993-01
    Stage
    : Withdrawal of International Standard [95.99]
  • Edition
     : 3
    Number of pages
     : 4
  • Technical Committee :
    ISO/TC 175
    ICS :
    73.080 
  • RSS updates

Life cycle

Got a question?

Check out our Help and Support

  2. Store
  3. Standards catalogue
  4. ICS
  5. 73
  6. 73.080
  7. ISO 4284:1993