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National Repository of Grey Literature 12 records found  previous11 - 12  jump to record: Search took 0.01 seconds. 
Optimization of atomization conditions for bismut, lead and tellurium hydrides for development of hydride atomizers.
 Štádlerová, Barbora ; Hraníček, Jakub (advisor) ; Spěváčková, Věra (referee)
This Master thesis is a part of a project: Hydride atomizers for atomic absorption and atomic fluorescence spectrometry - new horizons (GA ČR, P206/17-04329S, principal investigator: prof. RNDr. Jiří Dědina, CSc. DSc.) of which the general target is to make a leap towards the ideal hydride atomizer by optimization of atomization based on the knowledge of the distribution of free atoms and hydrogen radicals inside the atomizers. This thesis contributes to the project by optimizing the atomization parameters for atomic absorption spectrometry with hydride generation. The atomization parameters were optimized for three different types of atomizers - multiatomizer, diffusion flame and "flame-in-gas-shield" atomizer using three different analytes - bismuth, lead and tin. Optimal atomization parameters were found for each of the atomizer and each of the analyte - carrier gas flow and flow of other gases if needed for the analysis. Calibration curves and analytical figures of merit such as sensitivity, LOD and LOQ were estimated. Final comparison is based on the data obtained from calibration curves. MDF and FIGS atomizers are mostly used with AFS detection and they provide lower sensitivity and higher detection limits with AAS detection in comparison with MMQTA. Since the analytes are known to trap...
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Determination of total iron content in selected food supplements
 Štádlerová, Barbora ; Hraníček, Jakub (advisor) ; Rychlovský, Petr (referee)
In this bachelor's thesis a comparison of three analytical methods for total iron determination in three different food supplements is described. The examined food supplements are Biovit C60, Hemofin and Aktiferrin Compositum. The three methods used for determination of iron are manganometric titration, atomic absorption spectrometry and sequential injection analysis paired with spectrophotometric detection. Two methods were used to prepare solutions of each supplement - they were dissolved in distilled water and also prepared by microwave decomposition of samples. The microwave decomposition is definitely a more suitable preparation method in this case, considering the composition of each supplement. The least suitable of all three methods mentioned above has to be the manganometric titration due to the composition of the matrix. The calibration curve was used to determine total iron content by atomic absorption spectrometry with flame atomization. The agent used in sequential injection analysis to create a product, which can be detected by UV/VIS spectrophotometry was 1,10-phenantroline. The final product was red with the absorption maximum at 512 nm. The most accurate results were obtained by atomic absorption spectrometry.
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National Repository of Grey Literature : 12 records found   previous11 - 12  jump to record:
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10 Štádlerová, Barbora
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