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Powder feeding analysis in RF-ICP
Zlatník, Rostislav ; Veverka, Jakub (referee) ; Čížek, Jan (advisor)
The work is focused on the problematics of inductively coupled plasma, which is used for deposition of layers. We focused on two goals in the work. The first one focused on powder feeder, which is working on the vibration principle and is used in an apparatus that is using inductively coupled plasma. The aim is to determine its properties, dependence on different input parameters and working conditions. Is important to verify the suitability of its use for this kind of application. The assumption was to find the ideal configuration of the feeder for the given powder. After an overall assessment of the feeder properties, it was recognized as inappropriate for this application. The second goal is to spray tungsten layers with three different tungsten powders. Layers made with an inductively coupled plasma technology delivers promising results, but this issue needs to be intensively addressed in the future.
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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.
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Quantification of Elements in Plant Materials by Electrothermal Vaporization Inductively Coupled Plasma Optical Emission Spectrometry
Šerá, Luisa ; Matějková, Stanislava ; Mestek, O.
This paper describes optimization and validation of operating conditions of electrothermal vaporization (ETV) inductively coupled plasma optical emission spectrometry (ICP-OES) method for quantification of Ba, Ca, Co, Cu, Fe, K, Mg, Mn, Na, P, Sr and Zn in plant materials. Besides the optimization of the temperature program, the selection of the gaseous modifier and the spectral wavelengths to be measured, it was studied how the sample quantity affects the result quality of the developed method. During the validation process, the accuracy and precision of the method were checked by analysis of a certified reference material. Limits of detection were estimated by analyses of blank samples. For almost all previously mentioned elements, the method meets requirements commonly applied on analyses by ETV combined with ICP-OES.
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Design of aparature for RF plasma etching
Bárdy, Stanislav ; Bábor, Petr (referee) ; Mach, Jindřich (advisor)
This bachelor's thesis deals with a design of an ICP (Inductively Coupled Plasma) apparatus. The theoretical part consists of a research of a plasmatic graphene surface cleaning. Next are described plasma generation methods and an RF circuit design. The experimental part deals with a construction of the ICP apparatus and the impedance matching box, an optical diagnostics of a plasma discharge and a measurement of PMMA etching parameters (etch rate, roughness) by a spectroscopic reflectometry and an atomic force microscopy.
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Electrothermal vaporization
Dočekal, Bohumil
Utilization of various electrothermal vaporizaton (ETV) devices for sample introduction in inductively coupled plasma based atomic spectrometry methods is discussed. Optimum experimental conditions and design of ETV devices is stressed with respect to transport efficiency of sample introduction, to plasma loading, possible interferences etc.
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Slurry nebulization
Dočekal, Bohumil
Application of slurry nebulization techniques for sample introduction in inductively coupled plasma based atomic spectrometry methods is presented. Critical parameters of slurry nebulization and particle size distribution are discussed with respect to transport efficiency of sample introduction, to plasma loading, possible spectral and non-spectral interferences, accuracy and precision of the determination etc.
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