Absorptiometric determination of traces of iron extracted as ferroin thiocyanate.
Iron up to 3 ppm can be absorptiometrically determined by extracting the ferroin-thiocyanate complex at pH 1 into isobutyl methyl ketone (IBMK). At this pH thiocyanate itself reduces iron(III) so reductants such as hydroxylamine are not needed. The complex is very stable and has a molar absorptivity of 20.5 x 10(3) in IBMK at 525 nm. Most of the substances associated with iron in minerals and alloys do not interfere and methods are suggested for the elimination of the effect of those which do.
Rao
V P
VP
Chemistry Department Andhra University Waltair, S. IndiaIndia.
Rao
K V
KV
Sarma
P V
PV