Numéro de référence
ISO 2886:1973
ISO 2886:1973
© ISO 2025
ISO 2886:1973
Acétaldéhyde à usage industriel — Dosage du fer — Méthode photométrique au 2,2'- bipyridyle
Edition 1
1973-12
1973-12
Annulée
Résumé
The principle consists in the evaporation to dryness of a test portion and dissolution of the residue in hydrochloric acid. Reduction of iron(III) by means of hydroxylammonium chloride. Formation of the iron(II)- 2,2'-dipyridyl complex. Photometric measurement of the coloured complex at a wavelength of about 522 nm. Specifies the use of a spectrophotometer or photoelectric absorptionmeter. As an alternative it is permitted to employ a visual method comparing the test solution with a series of reference solutions. Has also been approved by the IUPAC.