National Repository of Grey Literature 3 records found  Search took 0.00 seconds. 
Spectrometric analytical methods for the analysis of metallic materials and the issue of measuring the carbon content in graphitic cast irons
Osička, Ondřej ; Pernica, Vítězslav (referee) ; Kaňa, Václav (advisor)
Competitive metallurgical production is almost impossible without the knowledge of the chemical composition of manufactured and finished melt, or the produced product. With growing customer demands for product quality and product characteristics, increasing technology speed and increasing product purity, there is growing demand for analyzes of chemical composition. These demands are very often against each other, especially the increasing demands on the speed and accuracy of analyzes. Analytical requirements may not only apply to the test technique, but also to the quality of the sample, which is inseparable from it. What is recently seen as the biggest drawback, the new technology is trying to use as its main priority. This is undoubtedly true of atomic emission spectrometry.
The optimization of melting as a decomposition process for material analysis.
Ptáček, Martin ; Koplík, Jan (referee) ; Šiler, Pavel (advisor)
Fusion is the process in which the sample particles are dissolved in the flux. This is used for the decomposition of substances which under normal conditions do not decompose in acid. For example, silicon, which is a substantial part of cement, is not degraded under standard conditions, so it is fused. Fusion may be in solution or in a pearl. Solution fusing is used for ICP-OES rather than XRF pearls. In addition to the pearl, XRF can also be measured in powder, but it is less accurate. This bachelor thesis deals with decomposition of standards and comparison of measured values with certified values. In the course of the work, samples of the standards were decomposed using several types of fluxes, measured at ICP-OES. The same standards were measured using XRF in the form of pearls. In addition to these two methods, elemental analysis of sulfur content was also performed. These methods were finally compared. From the measured data we can say that the best results are achieved with the ICP-OES method.
The determination of the composition of refractory material by X-ray fluorescence.
Janča, Martin ; Šilerová, Iva (referee) ; Šiler, Pavel (advisor)
The goal of this Bachelor thesis is to find the right way for the analysis of the refractory materials that would be accurate and could be repeated. The ideal method that would help us achieve our goal seems to be the fluorescent spectrometric analysis. This method is used very often in case of instant control of the quality of production in the cement and other heavy industry enterprises. Using the fluorescent spectrometric analysis comes with one issue, which is the presence of many distorting interferences. From this particular reason it is necessary to identify these interferences and then find the ideal solution of their elimination. Because of the possibility to have the sample in any shape or form at the x-ray florescent spectrometer it was necessary to choose the right method of preparing the sample for the analysis as well as choose the right parameter for the measuring itself and for the elimination of undesirable interferences.

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