Ultraviolet absorbance spectra of ferric iron solutions of varying iron concentrations maintained at a constant pH of 1.0 and a constant ionic strength of 0.1 were studied. The experimental conditions of low pH minimized the formation of the hydrolytic FeOH²⁺ and Fe(OH)₂⁺ species; thus, the spectra of iron solutions containing principally the Fe³⁺ species were recorded. The digitized spectral data were used to establish a model for the Fe³⁺ absorption spectrum that involves a Gaussian function with three parameters for each of the two absorption bands. These parameters were the wavenumber of the band maximum, ν‾_max, the full width at half maximum intensity, Δν‾_1/2, and the absorptivity of the band maximum, ɛ_max. This study provided estimates for these parameters at 25°C for 0.1 ionic strength media.

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