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Mercury in waste water
Paříková, Lucie ; Čelechovská, Olga (referee) ; Dočekalová, Hana (advisor)
In the time period from November to April of the academic year 2007/2008 presence of mercury and its forms was monitored in the waste waters of Faculty of Chemistry, VUT in Brno. The level of mercury was determined as total mercury with help of the atomic absorption spectrometry method and in available forms by diffusive gradient in thin film technique.
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Cycling of mercury and mercury species in the environment
Finsterlová, Hana ; Diviš, Pavel (referee) ; Dočekalová, Hana (advisor)
This bachelor’s thesis deals with the role of mercury in an environment. It summarizes informations about properties of mercury and its species. The thesis is engaged in the presence of mercury in atmosphere, water, soil and sediments. It deals with individual mercury intakes into the environment, anthropogenic or natural, and it follows transport of mercury between individual components of environment. Part of this thesis is given to the accumulation of mercury and mercury species into plants and organisms. It points out the toxicity of mercury, mercury species, and their effect to human organism. In the last chapter there is a resume and description of the instrumantal methods, which are commonly used for determination mercury and its compounds.
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Development of Gel Techniques for in situ Measurement of Bioavailable Metals in Soils and Sediments
Kovaříková, Vladěna ; Sommer, Lumír (referee) ; Janoš, Pavel (referee) ; Dočekalová, Hana (advisor)
The doctoral thesis deals with usage of gel techniques for in situ measurement of bioavailable metals in soils and sediments. The DGT technique was applied to soil samples from the localities of Zlín, Tuřany and Chrlice for estimation of bioavailable metals in soils. These soils were amended by sewage sludges in years 1980-1987. The experiment using diffusive gels with different pore size, APA and RG gels, has shown that the DGT can be used for assessment of trace metal soil complexes - small inorganic and larger organic. The results obtained by DGT measurements were approximately up to two orders of magnitude lower than metal concentrations obtained by leaching with sodium nitrate. The leaching with sodium nitrate does not provide true reflection of metal availability to plant root system and soil microorganisms and the DGT technique seems to be a better predictor of metal bioavailability. Only small differences between undisturbed and homogenized soil samples were found out by application of DGT to soil samples from localities of Veverská Bítýška and Ostrovačice. The undisturbed soil is not homogenous and the DGT unit gives information only about the part of the soil which is in direct contact with the unit. The procedure with soil slurry can be recommended for the characterization of large soil areas and estimation of bioavailable metals in soils. Gel techniques were also used for the study of processes occuring in sediments. Mercury species and other metals were analysed in surface water, pore water and sediments collected from two sampling sites in the Dele River in northern France. This river had been polluted during the last century by the activity of Métaleurop factory, which dealt with metal ore treatment. The application of DGT technique using two specific ion-exchange resins, Chelex-100 and Duolite GT-73, provided assessment of mercury in sediment pore water. DGT and DET techniques together with centrifugation provided also high resolution depth profiles of Fe, Mn, Zn, Pb, Cr and Cd in pore water. It is not possible to determine which sampling site was more contaminated. Only small differences in mercury species and metal content were observed between sampling sites. The Dele River can be classified as contaminated river according to total mercury content in sediments and as slightly contaminated river from the point of view of methylmercury content. Correlations between mercury species and sulphide content confirm that total mercury and sulphide content count among factors influencing the mercury release to pore water and controlling processes of methylation and demethylation. Only low toxicity of sediment slurries was found out by the bioluminiscence test with Vibrio fischeri. The results of doctoral thesis demonstrate gel techniques as a very good tool in environmental analysis.
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Cycling of selected metals in the environment.
Šebková, Michaela ; Diviš, Pavel (referee) ; Dočekalová, Hana (advisor)
This bachelor thesis deals with a group of selected metals (nickel, zinc, copper, cadmium and lead) in environmental components. It occupies with natural and anthropogenic inputs of metals to the atmosphere, the water und the soil and with their transport among them components. It engages too in a question of a penetration of metals to the biosphere and in their ensuant transport within the biosphere. At each metal is description of its natural sources, chemical and physical properties, inputs in environment, transport within the biosphere and positive and negative effects on living organism is described for each studied metal. The last chapter of this thesis deals with determination of selected metals in environmental components. It discribes procedures of determination from planning over sampling and processing of sample to the final determination of metals by instrumental methods.
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Transport of selected metals from the soil to the plants
Šilerová, Iva ; Sommer, Lumír (referee) ; Dočekalová, Hana (advisor)
This bachelor thesis focuses on the soil, contamination of selected heavy metals and transport of heavy metals from soil to plants. The entry of heavy metals, their reactions in the soil and their transport into the plant material are described here. Lead, cadmium and copper have been selected as the studied toxic metals. There are also described methods of soil sampling, sample preparation for analysis and determination of heavy metals in the sample.
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Determination of selected metals in unconventional fruit species
Křížová, Soňa ; Dočekalová, Hana (referee) ; Diviš, Pavel (advisor)
The aim of this diploma thesis is determination of selected metals in unconventional fruit species, specifically in cornelian cherry (Cornus mas), sea buckthorn (Hippophae rhamnoides) and medlar (Mespilus germanica).There is informationabout 16 analysed metals – As, B, Be, Cd, Co, Cr, Cu, Fe, Mn, Mo, Ni, Se, Sn, Pb, V, Zn. There are described analytical techniques for elemental analysis and methods for destruction biological material. Samples for analysis are prepared by using microwave mineralization and ICP-MS for detection. This is described in the experimental part of the diploma thesis. Analysis confirmed that unconventional fruits are rich sources of trace elements.
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Legal aspects of gender reassignment
Dočekalová, Hana ; Frinta, Ondřej (referee)
Legal aspects of gender reassignment Abstract Thesis deals with legal aspects of gender reassignment, especially with legal conditions of gender reassignment witch are required by the Czech law. Furthermore, the thesis provides a general introduction to the issue of transsexuality, deals with the etiology of transsexuality, and defines its two fundamental types, namely the MtF and the FtM transsexuality. This thesis also recalls the position of transgender people in society, as transgender people continuously face various forms of discrimination. In particular, the text of the thesis is focused on the legal analysis of the issue of gender reassignment. The thesis deals with all legal regulations that contain provisions concerning gender reassignment. In this manner, it deals with all relevant legal provisions included in the Czech Civil Code, in the Act on Specific Health Services, and in the Registry Act. The thesis also deals with the possible future legal regulation of gender reassignment using the de lege ferenda considerations. This bill could adapt the Czech legal regulation of gender reassignment to the case-law of The European Court of Human Rights as well as the legal standarts in other european countries. In the thesis, there is also the whole process of gender reassignment including both the...
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Legal aspects of gender reassignment
Dočekalová, Hana ; Hendrychová, Michaela (advisor) ; Šustek, Petr (referee)
Legal aspects of gender reassignment Abstract Thesis deals with legal aspects of gender reassignment, especially with legal conditions of gender reassignment witch are required by the Czech law. Furthermore, the thesis provides a general introduction to the issue of transsexuality, deals with the etiology of transsexuality, and defines its two fundamental types, namely the MtF and the FtM transsexuality. This thesis also recalls the position of transgender people in society, as transgender people continuously face various forms of discrimination. In particular, the text of the thesis is focused on the legal analysis of the issue of gender reassignment. The thesis deals with all legal regulations that contain provisions concerning gender reassignment. In this manner, it deals with all relevant legal provisions included in the Czech Civil Code, in the Act on Specific Health Services, and in the Registry Act. The thesis also deals with the possible future legal regulation of gender reassignment using the de lege ferenda considerations. This bill could adapt the Czech legal regulation of gender reassignment to the case-law of The European Court of Human Rights as well as the legal standarts in other european countries. In the thesis, there is also the whole process of gender reassignment including both the...
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Modifikované škroby a jejich využití v potravinářském průmyslu
Dočekalová, Hana
The bachelor thesis is arranged chronologically in order to make the issue of modified starches as comprehensible as possible. First, it deals with the topic of foodstuffs and their possible modifications, both using technological manufacturing processes and through addition of other substances. The substances are subsequently described and their possible addition to foodstuffs is clarified as regards the regulations in the legislature in the Czech Republic. The thesis then deals with substances that in a certain way influence the texture of the foodstuff and subsequently, the viscosity of foodstuffs is described. The thesis focuses on the viscosity o foodstuffs, because both native and modified starch influences this specific characteristic. The chapters that follow include information about the natural starch, its structure and properties and point out the insufficient range of use of the natural starch in the food industry. Afterwards, the most important part of the thesis follows, the description and explanation of the term modified starch. It includes individual manufacturing processes and obtained properties of modified starches belongining to Czech legislation ie. oxidized, substituted and crosslinked starches, as well as modified starches without the need for legislation are physically modified starches (thermally treated), hydrolysates and enzyme treated starches. In all cases, their uses in the food industry is also outlined and the relevant legislation dealing with these additives is outlined.
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