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The biological activity of humic preparations in the form of sodium and potassium humates was investigated depending on the structural group parameters of humic acids (HAs): the degree of aromaticity (fa), a hydrophilic–hydrophobic parameter (fhh), and a parameter reflecting the ratio between aromatic and aliphatic fragments in the organic matter of HAs (far/al). Native and modified HAs isolated from...
The effect of alkaline extraction parameters on the yield, biological activity, and functional group composition of the humic acids (HAs) of brown coals was investigated. It was found that the functional group composition of the HAs can be intentionally affected by varying alkaline extraction parameters (the amount of an alkali and the duration and temperature of the process). The biological activity...
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