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Preparation processes and properties of porous zinc material
Moleková, Kristína ; Březina, Matěj (referee) ; Hasoňová, Michaela (advisor)
Bachelor thesis occupy with preparation of porous material from zinc powder by cold pressing, cold pressing followed by sintering and hot pressing. This thesis contain both preparation of bulk material, and charakterization of materials based on the compaction process conditions. Impact of pressing process on subsequent progress of sintering and final attributes of materials is evaluated. Bulk material is characterized considering to structure, porosity, and physical-mechanical properties. Properties of final metarial will serve to optimize conditions for process of pressing and sintering.
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Determination of heavy metals in soils and sediments in the region Revúce
Kováč, Lukáš ; Vávrová, Milada (referee) ; Doležalová Weissmannová, Helena (advisor)
This thesis aims to assess the extent of contamination of soil and sediment with risk metals in Jelšava. The main polluter of the environment in this area is the magnetize factory. Sampling of soils and sediments were made in three seasons. Sampling times were staggered to represent different seasons and to take into account the impact of the seasons on the obtained values of the concentrations in soil and sediment. Sampling sites were selected according according to the different distances from the factory and according to the different loading of roads. In each of the collected samples were determined concentrations of the elements copper, lead, zinc, nickel, manganese, mercury, cadmium and vanadium. Copper, lead, zinc, nickel and manganese were analyzed by atomic absorption spectrometry with atomization in a flame (F AAS), cadmium and vanadium were determined by atomic absorption spectrometry with electrothermal atomization (ET AAS). For the determination of mercury was used mercury analyzer (AMA).
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Application of a commercial multimode sample introduction system as a generator of volatile compounds
Hadbavníková, Alexandra ; Nováková, Eliška (advisor) ; Červený, Václav (referee)
EN The main goal of this thesis was the determination of zinc using a commercial multimode sample introduction system (MSIS) as a generator of volatile compounds with inductively coupled plasma mass spectrometer as detector. The generation of volatile compounds took place using sodium borohydride in an acid environment. In the first step of the experiment, the following parameters affecting the generation of volatile compounds were optimized: acid selection, acid concentration, sodium hydroxide concentration, mass concentration of sodium borohydride, mass concentration of 8-hydroxyquinoline, volume of the injection loop and flow rates of sample, carrier gas and hydrogen. Subsequently, figures of merit of the method were determined under optimal conditions. The limit of detection was 2.8 μg·dm-3 and the limit of quantification was 9.3 μg·dm-3 . Generation efficiency of the volatile zinc compound was determined as 3.7 %, which is the highest efficiency yet achieved for this element and generation system in this laboratory. Interference studies did not demonstrate the ability of any of the tested hydride-forming or transition elements to act as a modifier increasing the generation efficiency, but at the same time, none of the investigated elements proved to be a significant interferent. Key words...
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Interactions of reduced and oxidized glutathione with copper, iron and zinc
Júnová, Ingrid ; Karlíčková, Jana (advisor) ; Jenčo, Jaroslav (referee)
Charles University Faculty of Pharmacy in Hradec Králové Department of Pharmaceutical Botany Candidate: Ingrid Salanciová Supervisor: PharmDr. Jana Karlíčková, Ph.D. Title of Thesis: Interactions of reduced and oxidized glutathione with copper, iron and zinc Copper (Cu), iron (Fe) and zinc (Zn) are important trace elements that are necessary for proper function of the body. Excess but also the lack of these metals may lead to pathological conditions. Glutathione is the main antioxidant in the human body so it is expected to protect the organism against concequences of metal excess. Glutathione occurs in the reduced (GSH) and oxidized state as glutathione disulfide (GSSG) in the organism, both states forming an important redox system. On the other hand, glutathione can reduce these metals so that could participate in the formation of free radicals (metal based Fenton reaction). In this diploma thesis, was tested the ability of reduced and oxidized glutathione to interact with Fe, Cu and Zn in various (patho) physiological pH conditions was tested by using in vitro spectrophotometric competitive methods. Interactions include not only the chelation of Cu, Fe and Zn ions, but also their reductive activity toward Cu2+ and Fe3+ cations. Hematoxylin, bathocuproinedisulfonic acid disodium salt, ferrozine...
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Interactions of reduced and oxidized glutathione with copper, iron and zinc
Salanciová, Ingrid ; Karlíčková, Jana (advisor) ; Jenčo, Jaroslav (referee)
Charles University Faculty of Pharmacy in Hradec Králové Department of Pharmaceutical Botany Candidate: Ingrid Salanciová Supervisor: PharmDr. Jana Karlíčková, Ph.D. Title of Thesis: Interactions of reduced and oxidized glutathione with copper, iron and zinc Copper (Cu), iron (Fe) and zinc (Zn) are important trace elements that are necessary for proper function of the body. Excess but also the lack of these metals may lead to pathological conditions. Glutathione is the main antioxidant in the human body so it is expected to protect the organism against concequences of metal excess. Glutathione occurs in the reduced (GSH) and oxidized state as glutathione disulfide (GSSG) in the organism, both states forming an important redox system. On the other hand, glutathione can reduce these metals so that could participate in the formation of free radicals (metal based Fenton reaction). In this diploma thesis, was tested the ability of reduced and oxidized glutathione to interact with Fe, Cu and Zn in various (patho) physiological pH conditions was tested by using in vitro spectrophotometric competitive methods. Interactions include not only the chelation of Cu, Fe and Zn ions, but also their reductive activity toward Cu2+ and Fe3+ cations. Hematoxylin, bathocuproinedisulfonic acid disodium salt, ferrozine...
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Preparation processes and properties of porous zinc material
Moleková, Kristína ; Březina, Matěj (referee) ; Hasoňová, Michaela (advisor)
Bachelor thesis occupy with preparation of porous material from zinc powder by cold pressing, cold pressing followed by sintering and hot pressing. This thesis contain both preparation of bulk material, and charakterization of materials based on the compaction process conditions. Impact of pressing process on subsequent progress of sintering and final attributes of materials is evaluated. Bulk material is characterized considering to structure, porosity, and physical-mechanical properties. Properties of final metarial will serve to optimize conditions for process of pressing and sintering.
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Determination of heavy metals in soils and sediments in the region Revúce
Kováč, Lukáš ; Vávrová, Milada (referee) ; Doležalová Weissmannová, Helena (advisor)
This thesis aims to assess the extent of contamination of soil and sediment with risk metals in Jelšava. The main polluter of the environment in this area is the magnetize factory. Sampling of soils and sediments were made in three seasons. Sampling times were staggered to represent different seasons and to take into account the impact of the seasons on the obtained values of the concentrations in soil and sediment. Sampling sites were selected according according to the different distances from the factory and according to the different loading of roads. In each of the collected samples were determined concentrations of the elements copper, lead, zinc, nickel, manganese, mercury, cadmium and vanadium. Copper, lead, zinc, nickel and manganese were analyzed by atomic absorption spectrometry with atomization in a flame (F AAS), cadmium and vanadium were determined by atomic absorption spectrometry with electrothermal atomization (ET AAS). For the determination of mercury was used mercury analyzer (AMA).
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