Ammonium sulphate for industrial use — Determination of iron content — 2,2´- Bipyridyl photometric method
NORMA vydaná dňa 1.4.1974
Označenie normy: ISO 2992:1974
Dátum vydania normy: 1.4.1974
Počet strán: 3
Približná hmotnosť: 9 g (0.02 libier)
Krajina: Medzinárodná technická norma
Kategória: Technické normy ISO
Description / 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.