Reference number
ISO 2992:1974
ISO 2992:1974
© ISO 2024
International Standard
ISO 2992:1974
Ammonium sulphate for industrial use — Determination of iron content — 2,2'- Bipyridyl photometric method
Edition 1
1974-04
1974-04
ISO 2992:1974
8042
Published
(Edition 1, 1974)
This publication was last reviewed and confirmed in 2019.
Therefore this version remains current.
Abstract
Applicable to Fe contents of equal to or more than 0.0001 % (m/m). The reaction bases on the reduction of iron(III) by hydroxylammonium chloride. Formation of the complex between iron(II) and 2,2'-dipyridyl in a buffered medium (pH value between 4.5 and 6). Photometric measurement of the coloured complex at a wavelength of about 522 nm. Has also been approved by the IUPAC.