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

ISO/R

ISO/R 65:1971

ISO/R 1337:1971

ISO/R 1247:1971

ISO/R 1910:1971

ISO/R 1738:1971

ISO/R 1224:1971

ISO/R 1982:1971

ISO/R 1629:1971

ISO/R 1661:1971

ISO/R 1685:1971

ISO/R 1927:1971

ISO/R 1998:1971