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The Study of Aggregation of Humic Acids in Different Xenobiotic Environments
 Hronová, Aneta ; Smilek, Jiří (referee) ; Kalina, Michal (advisor)
Theme of the presented bachelor thesis is the study of the aggregation behavior of the humic acids (HA) in the environment of extraneous substances. As extraneous substances, three cationic surfactants were selected (CTAB, TTAB and Septonex). In the experimental part of the thesis, the humic acids were characterized in detail using different methods (elemental analysis, ash content determination, titration acidity determination). The experimental part of the thesis is dealing with the structure of created HA-surfactant systems. These systems were characterized using the results of the elemental analysis and FT-IR spectroscopy. The key part of the experimental part of the study is represented by the selection of proper methods and by determination of the critical aggregation concentration of the humic acids in the surfactant environment. For these purposes, two key methods were selected in the frame of the presented bachelor thesis: isothermal titration calorimetry and dynamic light scattering. The first method is sensitive owing to the energetic fluctuations, in the case of the dynamic light scattering we are able to detect well the changes in the particle size caused by mutual interactions of particular substances in the system.
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