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ISO/R 1982:1971 PDF
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Nitric acid for industrial use — Determination of iron content — 2,2′- Bipyridyl photometric method
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.
| Edition | 1971 |
|---|---|
| Published Date | 1971 |
| Published By | ISO/R |
| Page Count | 4 |
