Colorimetric Determination of Iron of Mixed Valency by Orthophenanthroline1
- G. S. R. Krishna Murti,
- V. V. Volk and
- M. L. Jackson2
A colorimetric method for the determination of Fe in a mixed Fe3+ and Fe2+ valency system has been proposed. Complete reduction of Fe3+ to Fe2+, which was essential for the formation of a stable colored complex with orthophenanthroline, was obtained when the iron solution, buffered at pH 3.5 with sodium acetate, was heated for 1 hr at 65C with 5% hydroxylamine hydrochloride. This reduction procedure was found to be suitable even for solutions at a higher pH where iron was present either as Fe3+ or as a hydroxylated complex. The organe color complex was found to be stable at pH values 2 to 9 for at least 20 hr and no interference of citrate ion was observed in the stability or the formation of the color.Please view the pdf by using the Full Text (PDF) link under 'View' to the left.
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