Functional groups and molecular fragments are identified and quantified and the paramagnetic activity of humic substances
is assessed. It is shown that, compared with fulvic acids, humic acids have fewer oxygen-containing functional groups and
more aromatic structures.
Key words humic substances - structure - podzolic and bog-podzolic soils
Original Russian Text © V.A. Beznosikov, E.D. Lodygin, 2009, published in Doklady Rossiiskoi Akademii Sel’skokhozyaistvennykh
Nauk, 2009, No. 2, pp. 29–31.