PROPERTIES OF HUMIC SUBSTANCES EXTRACTED FROM SEDIMENT AT GOCZAŁKOWICE DAM RESERVOIR.

Studies of humification processes of sediments collected from various points of the Goczałkowice dam were con- ducted. The humic and fulvic acids were extracted from the collected sediment. For study of physico-chemical properties of humic and fulvic acids, EPR and NMR spectroscopy were used. For extracted humic and fulvic acids, concentration of free radicals and the g factor were determined with EPR. The presence of characteristic functional groups was confirmed with NMR spectroscopy. It was found that humic and fulvic acids extracted from sediment at 8 places of the Goczałkowice Reservoir are characterized by similar physico-chemical properties, which points to a similar composition of sediment in the whole reservoir. Humic acids are relatively high aromatized, have a low free radicals content and a low value of the g factor. They have condensed aromatic rings with side-aliphatic chains. However, the extracted fulvic acids are less aromatized than humic acids. They have a weakly formed aromatic core with the dominance of side-aliphatic chains. The influence of the depth of the lake on the content of oxygen functional groups in the extracted humic and fulvic acids was also observed. [ABSTRACT FROM AUTHOR]