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Competitive mechanisms between rare earth elements (REE) and iron (Fe) for humic acid (HA) binding were investigated by coupling laboratory experiments and modeling calculations using PHREEQC/Model VI. This study aims, firstly, at determining the effect of Fe on REE–HA binding, in order to explain the REE pattern variability observed in natural organic-rich waters. Secondly, it has previously been...
The competitive binding of rare earth elements (REE) to purified humic acid (HA) and MnO 2 was studied experimentally using various HA/MnO 2 ratios over a range of pH (3 to 8). MnO 2 , humic acid and REE solutions were simultaneously mixed to investigate the kinetics of the competitive reactions. Aqueous REE–HA complex is the dominant species whatever the experiment time, pH...
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