Numéro de référence
ISO/R 915:1968
ISO/R 915:1968
© ISO 2024
ISO/R 915:1968
Acide sulfurique et oléums à usage industriel — Dosage du fer — Méthode spectrophotométrique au 2,2'- bipyridyle
Edition 1
1968-12
1968-12
Annulée
Résumé
The principle is based on evaporation of the test portion, taking up by means of hydrochloric acid and reduction of iron(III) by means of hydroxylammonium chloride. Formation of an iron(II) 2,2'-bipyridyl complex in a buffered medium at a pH value between 4.5 and 6. Spectrophotometric measurement of the coloured complex at a wavelength of about 522 nm. The method is applicable to the determination of iron content greater than 1 p.p.m.