Influence of humic acids on soil environment is
still subject of scientific discussions. The aim of above studies was
to investigate the relationships between selected physicochemical
properties of eleven peaty-muck soils and properties of humic
acids isolated from these soils. The following parameters were
determined for soils: total and organic carbon, density, ash, humifi-
cation, and the water absorption index. Humic acids were described
by: absorbance at 280 nm, absorbance ratios at 465 and 665 nm, at
260 and 665 nm, elemental composition and atomic ratios: H/C,
O/H, O/C, C/N, the degree of internal oxidation, and the content of
carboxylic and phenolic groups. Statistical analyses showed that
an increase in density, humification, and water absorption indices
of soils caused a significant increase in the humic acid parameters:
absorbance at 280 nm, the oxygen content, O/H, O/C ratios, inter-
nal oxidation degree, and functional groups. Statistically signifi-
cant negative correlations were found for the same parameters of
soils and for the hydrogen and carbon content as well as the H/C
ratio of humic acids. The relationships showed that there was a pos-
sibility to express the properties of humic acids on the basis of more
simple parameters measured for soil and without time-consuming
isolation of humic acids.
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