Structural modification of humic acids in a barrier discharge plasma

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Abstract

The paper presents the results of the initiation of chemical transformations of humic acids (HA) in a barrier discharge plasma. The HA were treated with ammonia vapor in the presence of various gaseous media like ethylene, air, oxygen, carbon dioxide, and mixtures of argon. The method of EPR spectroscopy has revealed a decrease in the number of paramagnetic centers after treatment of HA in a barrier discharge. This suggests the recombination of free radicals in their structure. As revealed by IR spectroscopy, the intensity of the band at 1383 cm–1 corresponding to the NO3 group increased when HA were exposed to discharge plasma in air. When HA were treated with ammonia vapor in an argon atmosphere, ammonium humate was formed, which is completely soluble in water.

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About the authors

N. V. Yudina

Institute of Petroleum Chemistry of the Siberian Branch of the Russian Academy of Sciences

Author for correspondence.
Email: natal@ipc.tsc.ru
Russian Federation, Tomsk

A. Yu. Ryabov

Institute of Petroleum Chemistry of the Siberian Branch of the Russian Academy of Sciences

Email: a.y.ryabov@yandex.ru
Russian Federation, Tomsk

S. V. Kudryashov

Institute of Petroleum Chemistry of the Siberian Branch of the Russian Academy of Sciences

Email: ks@ipc.tsc.ru
Russian Federation, Tomsk

S. I. Zherebtsov

Federal Research Center of Coal and Coal-Chemistry of Siberian Branch of the Russian Academy of Sciences, Institute of Coal SB RAS

Email: sizh@yandex.ru
Russian Federation, Kemerovo

K. S. Votolin

Federal Research Center of Coal and Coal-Chemistry of Siberian Branch of the Russian Academy of Sciences, Institute of Coal SB RAS

Email: kostvot@mail.ru
Russian Federation, Kemerovo

K. M. Shpakodrayev

Federal Research Center of Coal and Coal-Chemistry of Siberian Branch of the Russian Academy of Sciences, Institute of Coal SB RAS

Email: shpakodraevkm@mail.ru
Russian Federation, Kemerovo

N. V. Malyshenko

Federal Research Center of Coal and Coal-Chemistry of Siberian Branch of the Russian Academy of Sciences, Institute of Coal SB RAS

Email: profkemsc@yandex.ru
Russian Federation, Kemerovo

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2. Fig. 1. IR spectra: 1 – untreated GC; 2 – GC after barrier discharge in the presence of a mixture of argon with ammonia vapor.

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3. Fig. 2. IR spectra: 1 – untreated GC; 2 – GC after barrier discharge in the presence of air.

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