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Ultraviolet Spectroscopic Study of Ferric Iron Solutions

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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, νmax, the full width at half maximum intensity, Δν1/2, and the absorptivity of the band maximum, ɛmax. This study provided estimates for these parameters at 25°C for 0.1 ionic strength media.

Keywords: Ferric hydroxide; Ferric iron, hydrolysis; Gaussian bands; Ultraviolet spectroscopy

Document Type: Research Article


Affiliations: Graduate School of Oceanography, University of Rhode Island, Kingston, Rhode Island 02881

Publication date: May 1, 1980

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