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Interactions of metal ions with humic substances
Obručová, Kateřina ; Smilková, Marcela (referee) ; Klučáková, Martina (advisor)
This bachelor thesis is focused on humic substances, especially fulvic and humic acids. It deals with their genesis and subsequent extraction from nature materials. There are described not only physical and chemicals properties, structure of humic and fulvic acid, but also their reactivity. There is also described the method od isothermal titration calorimetry, which was subsequently used to study of interaction fulvic acid with selected metal ions (Cu2+, Ca2+, Mg2+). From the resulting titration data were determined values of reaction enthalpy, which was then compared with model complexes. From the resulting graphs, it was possible to determine when the reaction reached its maximum, the state when all the binding sites were full. Heat values were determined for this condition.
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Study of the availability of antibiotics in soil
Hroncová, Michala ; Landová, Pavlína (referee) ; Řezáčová, Veronika (advisor)
The diploma thesis is focused on the determination of tetracyclines, sulfonamides and fluoroquinolones from soil. Antibiotics such as tetracycline, chlortetracycline, oxytetracycline. ciprofloxacin, trimethoprim, sulfamethaxazole and sulfadiazin were selected due to frequent use in veterinary medicine. Due to the fact that the soil is a complex matrix and contains many components that can interfere with the detection signal of analytes, it was necessary to use the MAX column in the SPE method, which removes fulvic aned humic acid from analytes and the HLB column Final analysis of the analytes was performed by liquid chromatography with mass detesction (LC-MS). The method was also used for real soil samples, which were delivered from ÚKZUS.
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The Interaction of Graphene Oxide with Humic Acids, a Computational Study
FERLIN, Stefan
This study was focused on the interactions of Graphene oxide with humic acids in aqueous solutions. Additionally, to this work, Graphene oxide and water interactions with and without the addition of ions were studied. The behavior of a fulvic acid in the presence of Graphene oxide has been investigated as well. The study was performed using computer simulations that were achieved by Molecular Dynamics simulations. These simulations provided useful data on a nanometer scale.
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Study of the availability of antibiotics in soil
Hroncová, Michala ; Landová, Pavlína (referee) ; Řezáčová, Veronika (advisor)
The diploma thesis is focused on the determination of tetracyclines, sulfonamides and fluoroquinolones from soil. Antibiotics such as tetracycline, chlortetracycline, oxytetracycline. ciprofloxacin, trimethoprim, sulfamethaxazole and sulfadiazin were selected due to frequent use in veterinary medicine. Due to the fact that the soil is a complex matrix and contains many components that can interfere with the detection signal of analytes, it was necessary to use the MAX column in the SPE method, which removes fulvic aned humic acid from analytes and the HLB column Final analysis of the analytes was performed by liquid chromatography with mass detesction (LC-MS). The method was also used for real soil samples, which were delivered from ÚKZUS.
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Interactions of metal ions with humic substances
Obručová, Kateřina ; Smilková, Marcela (referee) ; Klučáková, Martina (advisor)
This bachelor thesis is focused on humic substances, especially fulvic and humic acids. It deals with their genesis and subsequent extraction from nature materials. There are described not only physical and chemicals properties, structure of humic and fulvic acid, but also their reactivity. There is also described the method od isothermal titration calorimetry, which was subsequently used to study of interaction fulvic acid with selected metal ions (Cu2+, Ca2+, Mg2+). From the resulting titration data were determined values of reaction enthalpy, which was then compared with model complexes. From the resulting graphs, it was possible to determine when the reaction reached its maximum, the state when all the binding sites were full. Heat values were determined for this condition.
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Positive influence of humate on the growth of selected plant species
Šerá, Božena ; Novák, František ; Gajdová, Iveta
Stimulatory effect of humic and fulvic acids extracted from local sources of peat (the origin of CR) on germination and early growth of hemp (Cannabis sativa L.), poppy (Papaver somniferum L.), pepper (Capsicum annuum L.) and rape (Brassica napus subsp. napus) was verified. Experiments were performed in standard laboratory conditions. Dry weight of sprout was determined. Obtained data were evaluated by the ANOVA test. Tested plants can be arranged in the order from the significant positive effect on the dry weight to the negative one as follows: hemp, poppy, pepper, rape.
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