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Abstract <p>The composition and properties of humic acids (HAs) isolated from oxidized brown coal at pH 2 and pH 7, processed in dielectic-barrier discharge plasma in air, have been studied. With an increase in the active discharge power from 11 to 22 W, the C/N atomic ratio and the number of <InlineEquation ID="IEq1"> <EquationSource Format="TEX">\({\text{NO}}_{2}^{ - }\)</EquationSource> <!--HighEn2570084Yudina-m1--> </InlineEquation> groups in the structure of HAs isolated at pH 2 increases, while the concentration of ArCOOH groups decreases. The antioxidant activity of HAs in a neutral medium also increases with the active discharge power.</p>

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Changes in the Composition of Humic Acids under Exposure to Dielectric-Barrier Discharge Plasma

  • 期刊论文

  • 发表日期：

    2026年2月1日

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  • N. V. Yudina,
  • N. Peshkova,
  • A. Yu. Ryabov,
  • S. V. Kudryashov

摘要

Abstract

The composition and properties of humic acids (HAs) isolated from oxidized brown coal at pH 2 and pH 7, processed in dielectic-barrier discharge plasma in air, have been studied. With an increase in the active discharge power from 11 to 22 W, the C/N atomic ratio and the number of \({\text{NO}}_{2}^{ - }\) groups in the structure of HAs isolated at pH 2 increases, while the concentration of ArCOOH groups decreases. The antioxidant activity of HAs in a neutral medium also increases with the active discharge power.