Paramagnetic properties of humic substances extracted from Albeluvisols of North-Eastern European Russia
2005
Lodygin, E.D.(Russian Academy of Sciences, Syktyvkar (Russian Federation). Ural Div. Komi Science Centre. Inst. of Biology)E-mail:[email protected] | Beznosikov, V.A.(Russian Academy of Sciences, Syktyvkar (Russian Federation). Ural Div. Komi Science Centre. Inst. of Biology) | Chukov, S.N.(St. Petersburg State University (Russian Federation))
Free radicals content has been determined in humic cids (HAs). Samples of HAs were collected from soil horizons along a gradient of increasing hydromorphology. The soils sampled were: a Siltic Albeluvisol, a Silti-Stagnic Albeluvisol, and a Stagni-Histic Albeluvisol (Siltic). Free radicals' content in HA molecular structure increases with increasing soil moisture. High free radicals content in HAs from all horizons of the Stagni-Histic Albeluvisol (Siltic) is apparently caused by biohydrothermal conditions of humus formation in this soil. It has been found out that in all studied soils free radicals content in HAs decreases downwards the soil profile.
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