Abstract
Potentiometric and spectrophotometric studies of the systems Cr(VI)-Fe(III)-H2O and Fe(III)-H2O systems have been performed. The formation of the complex FeCrO +4 is suggested and the corresponding thermodynamic formation constant has been calculated (logβ11 = 7.77 ± 0.02) . In order to understand the cation-anion interactions, a study of the precipitation equilibrium between Cr(VI) and Fe(III) has been carried out. The results indicate the formation of FeOHCrO4·2Fe(OH)3, a mixed precipitate whose thermodynamic solubility product is pKso=99.8±0.2.
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Olazabal, M.A., Etxebarria, N., Fernández, L.A. et al. Study of the complexation and precipitation equilibria in the system Cr(VI)-Fe(III)-H2O. J Solution Chem 23, 1111–1123 (1994). https://doi.org/10.1007/BF00976260
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DOI: https://doi.org/10.1007/BF00976260