ISSN 1017-2548(Print)
ISSN 2234-8530(Online)
Volume 46, Number 5
JKCSEZ 46(5)
October 20, 2002 

An analytical method for the spectrometric simultaneous determination of the individual ions in the mix-tures of Fe²⁺ and Fe³⁺ ions utilizing a technique of flow injection analysis has been developed. The method was based on the oxidation reaction between Fe²⁺ ion and H₂O₂ in an acidic medium and the subsequent formation of a red Fe(SCN)_x^3-x ion by the complexation reaction between Fe³⁺ ion and SCN^- ion. Unlike the conventional methods which require separate processes for the pre-treatment of the sample solution, the current method uses the same FIA system for the pre-treatment and the analysis of the sample. The detection limit for the determination of Fe³⁺ ion was found to be 6.00×10^-7M.