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Occurrence of mercury in the hair of school children.
HLADÍKOVÁ, Alena
The target of the thesis was to summarize the present knowledge to the topic of occurrence of mercury in hairs of the age categories of respondents defined in advance and to evaluate experimentally the load of the human organism by mercury. It was necessary to acquire a sufficient amount of hairs of children of school-age from the selected locality, to determine the total mercury amount in these samples and to evaluate the achieved results from the viewpoint of the toxic load. Within the bachelor thesis, 90 samples of human hairs of nine various age categories in the range from seven to nineteen years (of respondent age) were tested. In each age category, there were 50% samples of the male and 50% samples of female population. Moreover a questionnaire was made up filled in by each participating person. The determination of the total mercury contents was performed on the one-purpose spectrophotometer AMA-254. Means for the total mercury concentration moved deeply under the permitted limit values. Even the highest established mercury value which was 0,38554 mg/kg was under the limit. Using the one-way ANOVA (F2,87=5,4364; p<0,05) in STATISTICA 7 program, it was proved based on the reviewed influence of factors on the level of mercury in the body, that the mercury concentration depends on the consumption rate of the freshwater fish.
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Indirect speciation of mercury in soils and sediments with cold vapor atomic absorption spectrometry.
ŠPAČKOVÁ, Jitka
In the diploma thesis have been tested four extraction techniques for isolation of organic forms of mercury from sediments (liquid liquid extraction, microwave extraction in liquid liquid extraction, solid phase extraction and extraction with use of ionic exchange) followed by determination of mercury by atomic absorption spectrometer AMA?254. It has been achieved great results during liquid liquid extraction likewise ionic exchange extraction. Reached percents of orgHg were in accord with certified reference material for sediments CRM-580 and corresponded to 86,44 ? 16,63 %, resp. 87,01 ? 29,22 %. Thanks to a simple procedure, extraction speed and ease of determination of organic forms of mercury contain was first of all (in the first instance) verified a method with use of ionic exchange, whose principle and procedure is very elementary. This technique was applied to a number of real sediment samples collected from water tanks Jordan and Skalka. It was approved that this method has been presenting a suitable alternative to chromatographic methods or methods of electro?migration.
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Mercury and its compounds in environment
PRÉDA, Luboš
The bachelor{\crq}s dissertation on the topic ``Mercury and its Compounds in Environment{\crqq} discusses the current state of contamination of environment with metallic mercury and its inorganic and organic compounds, natural and anthropogenic sources of emissions of mercury in atmosphere, in soil and in aquatic ecosystems, physical and chemical properties of mercury and its compounds, use of mercury, its toxicity and also the risk of intoxication. Contamination of environment with mercury and its compounds is a serious ecological-social problem that affects directly the whole human population and in spite of this fact, the public is not informed adequately of it. The aim of the bachelor{\crq}s dissertation is to give a comprehensive outline of risks resulting from contamination of environment with mercury and its compounds not only in the field of prevention and safety of work in the scope of operation of the Police of the Czech republic, but also for the general public that would be interested in familiarizing with such issues and also to test knowledge of the population of impacts of contamination with mercury and its components. Collection of information about the extent of contamination of environment with mercury in the town of Tábor and its surroundings is another goal.
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