2. ENVIRONMENTAL ChEMISTRy & TEChNOLOGy 2.1. Lectures

Chem. Listy, 102, s265–s1311 (2008) Environmental Chemistry & Technology
major peaks, a first at λ ex /λ em = 455/515 indicating highly
conjugated aromatic compounds, like disubstituted
coumarins, xanthones and quinones and a second peak at
λ ex /λ em = 310/480 nm indicating simple phenolics like hydroxysubstituted
benzoic and cinnamic acid derivatives
Senesi et al. 5 . Peaks occured at the same positions, and differed
only in fluorescence intensity, which was the highest at
λ ex /λ em = 455/515 nm. This is evidence that HA from cultivated
soils were more humified and polycondensed. Alberts
et al. 1 reported, that the peak with similar λ ex /λ em = 455.7/
510.6 nm was observed in HA form Hungarian soils.
Thermal properties, mainly the degree of aliphaticity
“Z” (Table II) was lower in HA isolated from cultivated soil
(0.62 and 0.59) than HA from forest soil (1.61 and 1.27),
what confirmed higher condensation of aromatic structures
or humification degree of HA from cultivated soil.
Conclusions
Results of the present study confirmed that absorbance,
fluorescence and thermal characteristics of HA can be a sensitive
index of structural changes between cultivated and
s464
natural soils, thus, they can be used as an indicator of anthropogenic
influence on soil.
This work has been supported by grant VEGA 1/4432/07
and VEGA 1/0092/08.
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5. Senesi n., Miano T., Provenzano M. R., in: Humic Substances
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(Allard B., Borén H., Grimvall A., ed.), chapter V, p. 63.
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