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Stability of salts and complexes of humic acids
Nováčková, Kristýna ; Šmejkalová, Daniela (oponent) ; Kučerík, Jiří (vedoucí práce)
The ground of this work lies in the study of influence of metal ions incorporated onto the structure of humic substances during thermal stress in the presence of air oxygen. For these purposes, lignitic humic acid was used. The amount of binding sites, i.e. carboxylic groups, was determined by retitration-conductometric method. Mixing the humic acid with solutions of sodium and cupric ions gave the final products with different saturation degrees of detected binding sites. For the evaluation of thermooxidative stability, thermogravimetric analysis and differential scanning calorimetry were performed. The results bring new view upon the reactivity of humic acid with metal ions in the liquid state, indicate possible formation of “porous” structure of sodium humates and their water-retention ability.
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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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Emoce v experimentální animaci
Nováčková, Jana Kristýna ; DĚCKÁ, Eliška (vedoucí práce) ; ČIHAŘOVÁ, Libuše (oponent)
Tato práce pojednává o vztahu emocí a experimentálního animovaného filmu v současnosti. Zabývá se emocionálním prožitkem diváka na základě nenarativního vyprávění filmu a jeho výrazových prostředků.
Současně zkoumá, jaké jsou tvůrčí postupy a postoje filmových tvůrců k emocím v experimentální animaci. Analýza dotazníků také objasňuje, zda tvůrce počítá s divákovou interpretací filmu.
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Intuice v tvůrčím procesu animovaného filmu
Nováčková, Jana Kristýna ; DĚCKÁ, Eliška (vedoucí práce) ; ČIHAŘOVÁ, Libuše (oponent)
Tato práce pojednává o vztahu emocí a experimentálního animovaného filmu v současnosti. Zabývá se emocionálním prožitkem diváka na základě nenarativního vyprávění filmu a jeho výrazových prostředků.
Současně zkoumá, jaké jsou tvůrčí postupy a postoje filmových tvůrců k emocím v experimentální animaci. Analýza dotazníků také objasňuje, zda tvůrce počítá s divákovou interpretací filmu.
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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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Stability of salts and complexes of humic acids
Nováčková, Kristýna ; Šmejkalová, Daniela (oponent) ; Kučerík, Jiří (vedoucí práce)
The ground of this work lies in the study of influence of metal ions incorporated onto the structure of humic substances during thermal stress in the presence of air oxygen. For these purposes, lignitic humic acid was used. The amount of binding sites, i.e. carboxylic groups, was determined by retitration-conductometric method. Mixing the humic acid with solutions of sodium and cupric ions gave the final products with different saturation degrees of detected binding sites. For the evaluation of thermooxidative stability, thermogravimetric analysis and differential scanning calorimetry were performed. The results bring new view upon the reactivity of humic acid with metal ions in the liquid state, indicate possible formation of “porous” structure of sodium humates and their water-retention ability.
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