ISO 4284:1993
Acid-grade and ceramic-grade fluorspar — Determination of sulfide content — Iodometric method
Reference number
ISO 4284:1993
Edition 3
1993-01
Withdrawn
ISO 4284:1993
10129
Withdrawn (Edition 3, 1993)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

  •  : Withdrawn
     : 1993-01
    : Withdrawal of International Standard [95.99]
  •  : 3
     : 4
  • ISO/TC 175
    73.080 
  • RSS updates

Got a question?

Check out our FAQs

Customer care
+41 22 749 08 88

Opening hours:
Monday to Friday - 09:00-12:00, 14:00-17:00 (UTC+1)