Changes in the Composition of Humic Substances Depending
on the Depth of Peat Occurrence

V. V. Maryganova, N. N. Bambalov, V. P. Strigutskii, and S. V. Parmon

Institute for Nature Management, National Academy of Sciences of Belarus, ul. F. Skoriny 10, Minsk, 220114 Belarus

e-mail: vmaryganova@mail.ru

Received April 24, 2012

Abstract—The fractional group composition of humic substances and the chemical structure of humic acids
isolated from peats of different genesis from different depths of occurrence in peat deposits with the use of two
extractants (0.1 N NaOH and 0.1 M Na₄P₂O₇ at pH 7) were studied. Peat from the upper aerated layer of the
peat deposits contained more humic substances than peat from the deep layer, which occurred under anaerobic
conditions, due to the pyrophosphate fraction of humic acids and fulvic acids. The humic acids of peat isolated
from the deep layers of deposits had smaller molecular weights, and they were characterized by lower concen-
trations of carbohydrate and saturated hydrocarbon fragments and an increased contribution of aromatic poly-
conjugation systems, as compared with the humic acids of a surface layer.

DOI: 10.3103/S0361521913030051

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