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...

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 sorption of copper cations by the samples of brown coal, humic acids (HAs), and residual coal after HA extraction was studied with the use of Fourier transform IR spectroscopy, EPR spectroscopy,...

A method has been developed and tested for isolating humic acids and fulvic acids from lignite. The yields are high: up to 68.0% for humic acids; and up to

The possibility of using readily available materials—Tyul’gansk lignite, Tisul’sk lignite (and its naturally oxidized form), humic acids,

The effect of alkylation with alcohols in the presence of a mineral acid on the yield of humic acids from brown coal and peat was studied. A change in the