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

Resumen

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.

Informaciones generales

  •  : Retirada
     : 1993-01
    : Retirada de la Norma Internacional [95.99]
  •  : 3
     : 4
  • ISO/TC 175
    73.080 
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