ISO/R 909:1968
The principle consists in 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. Photometric measurement of the coloured complex at a wavelength of about 522 nm.
SDO:
ISO
Language:
English
ICS Codes:
71.060.30
Status:
Withdrawn
Publish date:
1968-11-30
Standard Number:
ISO/R 909:1968