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The casuistry of fatal accidents in apparatus diving in the Czech Republic
Kleinová, Karolína ; Vondrášek, David (advisor) ; Bažant, Filip (referee)
Title: The casuistry of fatal accidents in apparatus diving in the Czech Republic Objectives: This paper's goal is to describe and explain some particular fatal accidents in apparatus diving in the Czech Republic in years 1997-2004. As well as to show possible reasons and contexts of the elements leading to divers'passings. Methods: In this work was used a case study method, qualitative analysis of a diving expert evidences and subsequent reading of surveyed information Results: An important discovery is frequent neglecting of safety policy and overrating self capability in connection with the level of competence and experience. The most frequent downfall in surveyed cases is drowning. Keywords: diving, fatal accidents, risk elements
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The study of PET bottles in terms of the content of risk elements
Kryštofová, Petra ; Řezáčová, Veronika (referee) ; Komendová, Renata (advisor)
This bachelor thesis deals with the issue of PET bottles in terms of the possible content of risk elements. The contents of antimony, copper and lead were determined in the PET packaging material and in the beverages contained in the bottles. A total of 15 samples of bottled still and infant water available in the Czech sales network were analyzed. The PET material was decomposed in an acidic medium under the action of microwave radiation under optimized conditions. Atomic absorption spectrometric methods with flame or graphite cuvette atomization were used to determine selected risk elements based on the predicted analyte concentrations. In the PET packaging material, 159.35 to 265.68 mgkg-1 of antimony were determined, the determined values of lead concentration were in the range of 10.96-20.23 mg·kg-1 and the copper concentration in the range of 0.11-7,52 mg·kg-1. In bottled water and in bottled infant water, antimony was identified only in samples labeled 6a, 8a, 9a and 15a, all lead concentrations were measured below LODPb, copper was determined only in samples 2a, 6a and 8a. In none of the samples did the concentrations given by the valid legislation be exceeded. The limits of these metals are not set in legislation in the packaging materials, only specific migration limits and they have not been exceeded. However, the high concentration of antimony in PET poses a potential risk of contamination of the contents of these packages.
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Chemical Properties of Flue Gas Desulphurization Gypsums from Different Energy Sources
Kroulíková, S. ; Mercl, F. ; Száková, J. ; Perná, Ivana ; Tlustoš, P.
There were compared flue gas desulphurization gypsums (FGDGs) from four different power plants in the Czech Republic on chemical properties (pH, total content of nutrients and risk elements) and then was assessed their potential for utilization in agriculture as fertilizer without any risk to the environment. According to our results, the FGDGs represent an important possible source of sulphur (17.8 – 19.0 %) and calcium (23.0 – 30.2 %) for reduction of their deficit in the soil. However, contents of arsenic and of mercury in three of the tested FGDGs not fulfil the limit values for fertilizers. In the future, the remaining FGDG is thus necessary to evaluate for its fertilizing effects in model and field conditions.\n\n
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Methodical practice of taking samples fertilizers, plants and soil for determination of risk elements in agro-ecosystems and other parameters of soil fertility: applied methodology with certification
Kunzová, Eva ; Menšík, Ladislav ; Hejcman, Michal ; Dostál, Jiří
The methodology is describing latest findings on methods of sampling of barnyard manure, organic and organomineral fertilizers, samplings of vegetable material and soil for determination of risk elements content. As a part of the methodology there is description of laboratory methods for determination of dry matter content, pH, content of essential nutrients and risk elements in samples (of farmyard manure, organic and organomineral fertilizers, vegetable material and soil). Methodology is describing methods of characterization of quality of soil organic matter (SOM) and most important limit valuables of risk elements in fertilisers, substrates and soils. The application of methodology will be in the corporation farming on arable soil, grassland, classical and also ecological agriculture. It will be used also by accredited laboratories, agricultural consultant and in advisory framework of Ministry of Agriculture of Czech Republic etc. Methodology can be used by civil servants, students and teachers in secondary schools and agricultural universities etc.
Fulltext:  PDF
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The casuistry of fatal accidents in apparatus diving in the Czech Republic
Kleinová, Karolína ; Vondrášek, David (advisor) ; Bažant, Filip (referee)
Title: The casuistry of fatal accidents in apparatus diving in the Czech Republic Objectives: This paper's goal is to describe and explain some particular fatal accidents in apparatus diving in the Czech Republic in years 1997-2004. As well as to show possible reasons and contexts of the elements leading to divers'passings. Methods: In this work was used a case study method, qualitative analysis of a diving expert evidences and subsequent reading of surveyed information Results: An important discovery is frequent neglecting of safety policy and overrating self capability in connection with the level of competence and experience. The most frequent downfall in surveyed cases is drowning. Keywords: diving, fatal accidents, risk elements
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Chemical composition of photovoltaic panels
Koudelová, Marta ; Šebek, Ondřej (advisor) ; Tejnecký, Václav (referee)
The bachelor's thesis is focused on the issue of photovoltaic cells and panels. The literature search was formed from selected available literature with the purpose to characterize different types of the crystalline silicon photovoltaic cells and thin-films photovoltaic cells and describe the application of photovoltaic cells in the world and in the Czech Republic. In the next part of this thesis is a summary of current knowledge about recycling of photovoltaic cells and other utilization of layers and their possible impact on the environment. The practical part of the thesis deals with selected samples of PV panels. A few samples of photovoltaic panels were taken for chemical analyses. Chemical analyses are performed of the five samples of the photovoltaic panels. The results of chemical analyses were compared with acquired data from the literature. The results of the multielementary analysis of selected samples was that the photovoltaic panels contain a risk elements (e. g. As, Cd, Sb, Mo). The PV panels also contain economics utilizable elements (Ag). Content of silicon is up to 78,18 % SiO2. Key words Photovoltaic panel, photovoltaic cell, chemical analysis, risk elements, recycling
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Assessment the impact of the application of excavated sediments from the dam Luhačovice on the content of risk elements in arable soil
Kratěnová, Pavla ; Komendová, Renata (referee) ; Řezáčová, Veronika (advisor)
This diploma thesis focuses on an issue concerning an excavated sediment application on an arable soil and its impact on the soil quality based on a particular case of a deposition of the sediment from the dam Luhačovice on an adjacent agricultural area. The theoretical part of this thesis is focused on a soil and sediment characteristics and functions, contained risk elements, sampling methods, determination possibilities of particular risk elements and a description of conditions which emerged from a need for the deposition of sediment obtained during scavenging of the dam Luhačovice. In the experimental part was described the process of sampling, samples processing and determining of concentration values for chosen risk elements (Cd, Cu, Hg, Ni, Pb) using flame or electrothermal atomic absorption spectrometry methods. This part also contains an evaluation of obtained results and a validation of an approval for the sediment deposition.
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The use of bioaccumulation capabilities aquatic plants and moss for monitoring some risk elements in the Malše river.
BEDĚRKOVÁ, Ivana
The aim of the graduation theses was the using bioaccumulation efficiency of plants, especially water mosses, for the monitoring of the occurence of risk elements in surface waters. The graduation theses assess the content of risk elements in this bioindicators in relation to quality of water supply river Malše. Water mosses susceptibly reflect the statement of water environment and they confirm very good quality of water in river Malše and its usability as water supply river in term of content of monitored risk elements (chrome, arsenic, zinc, lead, cadmium, mercury and uranium).
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