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(46-38) Humic Substances in Transformation of Xenobiotica. Klavins, Maris*,1, Babre, Kristine2, 1 University of Latvia, raina blvd. 19, Riga, Latvia2 ABSTRACT- Humic substances (HS) much influence soil fertility, and they play a principal role in the turnover of organic carbon. The interaction of humic substances with xenobiotics may modify the uptake and toxicity of these compounds by aquatic organisms, and affect the fate of pollutants in the environment. Of the humic properties which have been little analyzed is their catalytic activity, though HS contain many groups and structures which in similar macromolecules are responsible for their catalytic activity. In the present study the catalytic activity of humic substances of different origin in the reactions of hydrolysis of esters and condensation of carbonylcompounds has been studied. These reactions can be of importance with regard to the fate of environmental pollutants. Humic substances demonstrate appreciable impact on the fate of organic xenobiotics in natural environments. Of the humic substances, the aquatic fulvic acids are the most active in hydrolysis reactions, but the velocity of studied reaction depends also on temperature, the concentration and of humic substances used, as well as presence of surfactants thus indicating possible micellar catalysis presence. Key words: humic substances, degradation, xenobiotica |
