ABSTRACT
Ivane Javakhishvili Tbilisi State University Chavchavadze Avenue 1, Tbilisi 0128, Georgia, E-mail: giorgi.makharadze@yahoo.com
Abstract ................................................................................................. 161 15.1 Introduction ................................................................................ 162 15.2 Experimental Part ....................................................................... 162 15.3 Results and Discussions ............................................................. 164 15.4 Conclusions ................................................................................ 165 Keywords .............................................................................................. 165 References ............................................................................................. 166
ABSTRACT
Fulvic acids, isolated from surface waters, have been studied for the first time by the thermal analyze. Fulvic acids investigated by thermogravimetric and differential thermal analysis are characterized by one endothermal and four exothermal effects. The loss of mass in low temperature range for fulvic acids isolated from the bottom sediments and water sample makes 30 and 38 percent and over the high temperature range it equals 62 and 48
percent respectively. It is shown that the degree of aromatization of fulvic acids isolated from the bottom sediments was higher than that of fulvic acids isolated from the water sample.
