National Repository of Grey Literature 3 records found  Search took 0.00 seconds. 
Analysis of selected elements in dendrological sample of spruce trunk
Pastrňáková, Aneta ; Hraníček, Jakub (advisor) ; Šíma, Jan (referee)
The aim of this bachelor thesis was to determine selected elements, specifically iron, manganese, sodium, potassium, calcium, magnesium, barium, copper, zinc, strontium and aluminium in the sample of a spruce wood, taken from a dry tree from an area of South Bohemia. As a suitable and sufficiently sensitive method an atomic absorption spectrometry with flame atomization was used in this bachelor thesis. Before the analysis optimal conditions for the determination of these elements were experimentally found. The beam height above the burner edge and the acetylene flow rate were optimized depending on the type of oxidant used. Under the optimal conditions, the basic characteristics of the determination of individual elements were determined. These characteristics include mainly the limit of detection and quantification, sensitivity and repeatability. Optimized methods for determination of the selected elements were further applied for the analysis of real spruce wood samples. These samples were prepared by decomposition of the wood in a microwave device in the presence of nitric acid. In order to suppress interference, the suitable reagents were added to the analyzed samples to determine the selected elements (sodium, potassium, magnesium, calcium, barium). In total, 22 samples of wood of different...
Optimization of experimental setup for chemiluminescent determination of cobalt ions
Pastrňáková, Aneta ; Hraníček, Jakub (advisor) ; Dian, Juraj (referee)
The presented thesis deals with finding the optimal experimental setup for the chemiluminescent determination of cobalt ions by the technique of flow injection analysis (FIA) and sequential injection analysis (SIA) and comparing the achieved results of the determination. The determination is based on a chemiluminescent reaction, essence of which is oxidation of luminol with hydrogen peroxide in an alkaline solution in a flow system in the presence of cobalt ions, which acts as a catalyst of the reaction. In the experimental part of the work, a suitable setup for the detection of chemiluminescent light emission was found, followed by a suitable setup of the FIA and SIA systems for the determination of cobalt ions. For the detection of radiation, a glass spiral tube was selected, which was the most suitable for chemiluminescent measurement, compared to other experiments performed with different. In the next part of the work, optimal conditions for cobalt ions determination were experimentally found. As for the FIA technique, the volume flow rate of hydrogen peroxide, luminol and cobalt ions solutions was optimized. Furthermore, the concentration of the hydrogen peroxide solution and luminol. Last but not least, the dosing volume of the cobalt ions solution and the pH of the luminol solution were...
Analysis of selected elements in dendrological sample of spruce trunk
Pastrňáková, Aneta ; Hraníček, Jakub (advisor) ; Šíma, Jan (referee)
The aim of this bachelor thesis was to determine selected elements, specifically iron, manganese, sodium, potassium, calcium, magnesium, barium, copper, zinc, strontium and aluminium in the sample of a spruce wood, taken from a dry tree from an area of South Bohemia. As a suitable and sufficiently sensitive method an atomic absorption spectrometry with flame atomization was used in this bachelor thesis. Before the analysis optimal conditions for the determination of these elements were experimentally found. The beam height above the burner edge and the acetylene flow rate were optimized depending on the type of oxidant used. Under the optimal conditions, the basic characteristics of the determination of individual elements were determined. These characteristics include mainly the limit of detection and quantification, sensitivity and repeatability. Optimized methods for determination of the selected elements were further applied for the analysis of real spruce wood samples. These samples were prepared by decomposition of the wood in a microwave device in the presence of nitric acid. In order to suppress interference, the suitable reagents were added to the analyzed samples to determine the selected elements (sodium, potassium, magnesium, calcium, barium). In total, 22 samples of wood of different...

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2 Pastrňáková, Alena
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