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Stability of complexes of humic acids with heavy metals
Nováčková, Kristýna ; Šmejkalová, Daniela (oponent) ; Klučáková, Martina (vedoucí práce)
This diploma thesis focuses on comparison of thermo-oxidative and chemical stability of metal complexes with humic acids. Three elements representing the group of heavy metals were selected for these experiments (cobalt, copper, nickel). The utilized humic acid was extracted from South-Moravian lignite. Differently concentrated solutions of metals were used for complexes preparation, in order to observe the influence of their initial concentration on both studied stabilities of prepared complexes. Chemical stability of metal complexes was assessed in term of metal ions release from the humic acid structure into two different extraction agents (HCl, MgCl2). Thermo-oxidative behaviour was investigated employing methods of thermal analysis: differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA) in particular. The results of this work bring deeper insight into the realm of metal interaction with the humified part of soil organic matter; and at the same time try to shed light on the fate of metal pollutants in the environment and help in the desirable knowledge of treatments such as soil decontamination and remediation.

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