National Repository of Grey Literature 4 records found  Search took 0.00 seconds. 
Determination of arsenic species in seafood reference materials by ICP-MS with hydride generation and cryotrapping
Pokorná, Nikola ; Matoušek, Tomáš (advisor) ; Červený, Václav (referee)
The aim of this work was to determine chemical species of arsenic in sea originating certified reference materials. Measurements were done using method of hydride generation. Hydrides were preconcentrated in liquid nitrogen cooled tube and detected using inductively coupled plasma mass spectrometry. During the testing of the method, mutual conversion of arsenic species was observed for inorganic arsenic, monomethyl arsenic and dimethylarsenic. Further study revealed that with presence of matrix and hydrogen peroxide, demethylation occured only in hydride generation phase, not during extraction. Dissociation of hydrogen peroxide in extracts was verified using catalase. End of the demethylation process was proved using measurement with addition of arsenic species standards. The newly invented procedure was used to determine arsenic species in reference materials with sufficient accuracy. Final results are compatible with results from different method, and already published results as well. Key words: speciation analysis, arsenic, hydride generation, seafood, inductively coupled plasma mass spectrometry
Personnel management in selected company
POKORNÁ, Nikola
Owing to low unemployment in these days companies need to have a perfect personnel management to get the best employees in the market. The company described in the paper has the same problem. It needs to get perfect employees and this thesis tries to help them by means of analysis, questionnaires and explorations. The company Stavebniny DEK a. s. is located in Jihlava. It deals with supplies of materials and services for construction industry. The main aim of the bachelor thesis is to analyse and evaluate the current state of personnel management in a company. The analyses are intended on the recruitment and selection of employees, company education and the other personnel activities. All needed information was obtained from employees, managers and company´s reports. The results of research and analyses show the current function of personnel management in the company and suggest changes to improve the management.
Speciation analysis of inorganic arsenic in seafood material
Pokorná, Nikola ; Matoušek, Tomáš (advisor) ; Musil, Stanislav (referee)
This thesis was focused on extraction of individual arsenic species from reference materials of fish protein DORM-3 and DORM-4. Extracts were then analyzed by a hydride generation method with detection by inductively coupled plasma mass spectrometry. Materials were extracted in two ways - in a microwave device and in a heating block. It was found that extraction with 2% nitric acid is not efficient. Extraction performed in 2% nitric acid with addition of hydrogen peroxide at various concentrations increased the extraction yield, but it caused conversion of arsenic species. This conversion would mean the overestimation of inorganic arsenic content.
The Evaluation of the Selected Region from the Point of View of Readiness to the Development of Tourism
POKORNÁ, Nikola
This work explores the level of the microregion Pelhřimov from a tourism point of view. The main target of this work is to propose a strategy for more intense and greater development of tourism in this microregion. The methodology of the work includes analysis and synthesis of localization and implementation assumptions of the microregion. A strategy for the sustainable development is proposed on the basis of the detected results. The results of the work serve as a basis for the strategic documents of the city and region.

See also: similar author names
4 POKORNÁ, Nikola
Interested in being notified about new results for this query?
Subscribe to the RSS feed.