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• W2080923306 abstract "The interaction of indigenous radicals of humic acid (HA) with metal cations has been studied using high magnetic field (10.5T-285 GHz) electron paramagnetic resonance (HFEPR) spectroscopy. Strong [HA]−[metal] interaction was observed in the case of heavy metals, Cd2+, Pb2+, and Sr2+, leading to formation of covalent bonds with the radicals of HA. On the contrary, alkaline earth metal ions, such as Mg2+, generate only electrostatic interaction. The two types of indigenous radicals that exist in all HAs are influenced by the metal cations in a unified manner. This provides evidence that the two types of indigenous radicals in HAs originate from a unique, phenolic, moiety in HA. Mg2+ ions dramatically changed the pH profile of the two radical types of HA, downshifting their interconversion pKa by ca. 3 pH units. This is the first experimental observation of the effect of metals on the H-dissociation of the radical centers in HAs." @default.
• W2080923306 created "2016-06-24" @default.
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• W2080923306 date "2010-08-17" @default.
• W2080923306 modified "2023-10-16" @default.
• W2080923306 title "Effect of Metal Ions on the Indigenous Radicals of Humic Acids: High Field Electron Paramagnetic Resonance Study" @default.
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• W2080923306 doi "https://doi.org/10.1021/es101708f" @default.
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