Abstract
With the use of a voltammetric method, we found that humic acids (HAs) of different origin extracted from soils, sapropels, peats, and brown coals exhibit pronounced antioxidant properties. According to the results of a correlation analysis, it was shown that the antioxidant activity of HAs depends on the concentration of phenolic hydroxyls and carboxyl groups in a range of pH 10–5.5. Peat HAs were characterized by a maximum antioxidant activity.
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Yudina, N.V., Savel’eva, A.V. & Linkevich, E.V. Antioxidants in Humic Acids of Various Origins. Solid Fuel Chem. 56, 253–258 (2022). https://doi.org/10.3103/S0361521922040097
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DOI: https://doi.org/10.3103/S0361521922040097