ISO/R 1982:1971
$12.35
Nitric acid for industrial use — Determination of iron content — 2,2′- Bipyridyl photometric method
| Published By | Publication Date | Number of Pages |
| ISO | 1971-05 | 6 |
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.
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