Composite ferric oxyhydroxide-containing phases formed in neutral aqueous solutions of tryptophan and indole-3-acetic-acid (CROSBI ID 88836)
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Kamnev, Alexander ; Kuzmann, Erno ; Perfiliev, Yuri ; Vertes, Attila ; Ristić, Mira ; Popović, Stanko
engleski
Composite ferric oxyhydroxide-containing phases formed in neutral aqueous solutions of tryptophan and indole-3-acetic-acid
Mossbauer, FTIR and XRD analyses showed that in aqueous medium in air in the presence of L-tryptophan(Trp) or indole-3-acetic acid (IAA) the ambient-temperature ageing of the precipitates formed from ferrous sulphate at pH similar to 7 gave composite phases with varying proportions of gamma-FeOOH (a dominating crystalline phase), alpha-FeOOH (both fine-grained, showing superparamagnetic behaviour at 298 K, and relatively better crystallized) and amorphous ferric hydroxide. The experimental data suggested a competition for adsorption sites at the oxyhydroxide surface in the suspension during phase transformations, as well as the transformation of gamma-FeOOH (and/or amorphous ferric hydroxide) to alpha-FeOOH via the dissolution-reprecipitation mechanism. The formation of certain ferric oxyhydroxide phases in the presence of Trp and IAA-released e.g., in the course of bacterial and plant metabolism - can contribute to the regulation of soil mineral composition.
Mossbauer spectroscopy. Anthranilic acid. Iron oxides. Ferrihydrite. FeOOH particles. Beta-FeOOH
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