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Physicochemical and Antioxidant Properties of Humic Acids from Low-Sulfur Kazakhstan Shales
Автор(ы)
Дата публикации
1 сентября 2022 г.
Тип
journal article
Издатель
Pleiades Publishing
Журнал
Том
65
Выпуск
9
Первая страница
386
Последняя страница
391
ISSN
1068-364X
Аннотация
The structural, chemical, and physicochemical characteristics and antioxidant properties of humic acids isolated from shale in the Kenderlyk and Kiin fields are determined. Negative values of the acids’ oxidation are found: –3.62 and –4.06 for Kenderlyk and Kiin shale, respectively. Thus, the shale-based humic acids are reducing agents. IR spectroscopic data show clear absorption bands of hydroxyl, functional, and carbonyl groups. ESR spectroscopy indicates a high content of paramagnetic centers in the humic acids: 9.3 × 10 17 and 9.5 × 10 17 spin/g for Kenderlyk and Kiin shale, respectively. The paramagnetic centers in the molecular structure of the humic acids indicate that they are promising as antioxidants.
Области науки (FoS)