Spectrophotometric and complexometric determination of iron using the iron(III)-Arsenazo III system
Abstract
A spectrophotometric study of iron(III)- Arsenazo III aqueous solutions is described. At various reactant concentrations, Arsenazo III forms 2:1, 1:1 and 1:2 complexes with iron(III). Beer's law is obeyed up to iron concentrations of 0.7 p.p.m. A method for the complexometric determination of iron(III) with EDTA, using Arsenazo III as a metallochromic indicator, is proposed. The method allows the determination of iron in the range 0.5–60 mg.