Fig. 3From: Ligand exchange method for determination of mole ratios of relatively weak metal complexes: a comparative studyAbsorption spectra of (I) etidronate (1 × 10−3 M), (II) FeCl3 (2 × 10−4 M), and (III) FeCl3 (2 × 10−4 M) + etidronate (4 × 10−4 M) all in 2 M perchloric in addition to (IV) the absorption Spectrum of Fe(III)-salicylate in water/methanol (50:50, pH 3.2)Back to article page