Reference number
ISO/R 1982:1971
ISO/R 1982:1971
Nitric acid for industrial use — Determination of iron content — 2,2'- Bipyridyl photometric method
Edition 1
1971-05
Withdrawn
ISO/R 1982:1971
6714
Withdrawn (Edition 1, 1971)

Abstract

The method is applicable to the determination of iron contents greater than 0,0001 % (m/m). The principle consists in evaporation of a test portion, taking up by means of hydrochloric acid and reduction of iron(III) by means of hydroxylammonium chloride. Formation of iron(II)-2,2' -dipyridyl complex in ammonium acetate medium. Photometric measurement of the coloured complex at a wavelength of about 522 nm.

General information

  •  : Withdrawn
     : 1971-05
    : Withdrawal of International Standard [95.99]
  •  : 1
     : 4
  • ISO/TC 47
    71.060.30 
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