Selective spectrophotometric determination of iron(III) with EDTA

A spectrophotometric determination of iron as its iron (III)-EDTA-H₂O₂-NH₃ complex is described; up to 10-fold amounts of metals that form EDTA complexes absorbing at the same wavelength do not interfere because hydrogen peroxide reacts with thciron(IIl)-EDTA complex but does not affect the EDTA complexes of coppcr(II), nickel(II), cobalt(ltl) and chromium(Ilt).