Reference number
ISO 994:1973
ISO 994:1973
Potassium hydroxide for industrial use — Determination of iron content — 1,10- Phenanthroline photometric method
Edition 1
1973-04
Withdrawn
ISO 994:1973
5437
Withdrawn (Edition 1, 1973)

Abstract

Describes a method that is more sensitive and more widely used than the 2,2'-bipyridyl method. It is applicable to products having iron contents equal to or greater than 0.3 mg/kg. The principle is based on the reduction of iron(III) by hydroxylammonium chloride, formation of a iron(II)/1,10-phenanthroline complex in a buffered system. Photometric measurement of the coloured complex at a wavelength of about 510 nm. - Cancels and replaces ISO Recommendation R 994-1969.

General information

  •  : Withdrawn
     : 1973-04
    : Withdrawal of International Standard [95.99]
  •  : 1
     : 2
  • ISO/TC 47
    71.060.40 
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