Stability of coprecipitated natural humic acid and ferrous iron under oxidative conditions
C Colombo, G Palumbo, VM Sellitto, HG Cho… - Journal of Geochemical …, 2015 - Elsevier
Goethite and lepidocrocite are considered the stable species of Fe oxyhydroxides formed
from Fe 2+ oxidation in mildly acidic soil environments, while maghemite is formed in mildly
alkaline conditions. Complexing ligands, especially humic acid (HA), can change the
pathway formation of these iron oxyhydroxides from Fe 2+ oxidation. This research aimed to
assess the influence of HA on Fe 2+ oxidation and its effect on crystalline Fe mineral
products. Ferrous iron was added to HA at increasing initial COOH/Fe (II) charge ratios (R) at …
from Fe 2+ oxidation in mildly acidic soil environments, while maghemite is formed in mildly
alkaline conditions. Complexing ligands, especially humic acid (HA), can change the
pathway formation of these iron oxyhydroxides from Fe 2+ oxidation. This research aimed to
assess the influence of HA on Fe 2+ oxidation and its effect on crystalline Fe mineral
products. Ferrous iron was added to HA at increasing initial COOH/Fe (II) charge ratios (R) at …
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