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Survey of kinetics of spontaneous ozone decay in water
Fendrych, Adam ; Mergl, Václav (referee) ; Mega, Jaroslav (advisor)
In the general part of this diploma thesis are presented technical information collected on the issue of spontaneous decay of ozone in water solution and problems with analytical monitoring of these processes. Particular attention is paid to influence of pH value, bicarbonate and peroxide concentration on ozone decay kinetics. Experimental part is focused on the use of spectrophotometry in the study of chemical reactions associated with the spontaneous decay of ozone in distilled and tap water depending on pH and temperature after saturating of water by ozone prepared from air and pure oxygen. Direct photometry in UV range of spectrum (at 260 nm) was used to monitoring of ozone decomposition kinetics.
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Utilization of mass spectrometry and other analytical techniques for analysis of rhenium complexes
Vaňátková, Petra ; Jelínek, Ivan (advisor) ; Smrček, Stanislav (referee)
Rhenium complexes coordinated with suitable organic ligand gain increased interest in radiopharmaceutical medicine. Besides suitable radiological properties given by a metal ion itself, detailed knowledge of overall chemical properties of formed complexes, namely their exact structures, chemical stabilities and possible degradation pathways are essential pre-requisites for their clinical application. Selected rhenium complexes with pyrogallol 2,3-dihydroxynaphthalene and catechol as strongly bound ligands were prepared by a reaction of tetrabutylammonium tetrachlorooxorhenate with twofold molar excess of ligand in presence of various amount of triethylamine. The structures of formed complexes and their consequent reaction products were estimated by means of mass spectrometry with electrospray ionization. The kinetics of reactions in course of complex formation and consequent decomposition were primarily followed by UV- Vis absorption spectra measurement, complemented by single or continuous electrospray mass spectrometry analyses. Optimized HPLC and CZE procedures were utilized for monitoring of the composition of reaction mixtures in course of Re complex formation and for purity check of prepared complexes. Semi-preparative HPLC mode was succesfully utilized for isolation and final purification of...
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Survey of kinetics of spontaneous ozone decay in water
Fendrych, Adam ; Mergl, Václav (referee) ; Mega, Jaroslav (advisor)
In the general part of this diploma thesis are presented technical information collected on the issue of spontaneous decay of ozone in water solution and problems with analytical monitoring of these processes. Particular attention is paid to influence of pH value, bicarbonate and peroxide concentration on ozone decay kinetics. Experimental part is focused on the use of spectrophotometry in the study of chemical reactions associated with the spontaneous decay of ozone in distilled and tap water depending on pH and temperature after saturating of water by ozone prepared from air and pure oxygen. Direct photometry in UV range of spectrum (at 260 nm) was used to monitoring of ozone decomposition kinetics.
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Reaction kinetics of magnesium phosphate cements
Viani, Alberto ; Pérez-Estébanez, Marta
Magnesium phosphate cements (MPCs), are a class of new binders developed to reduce the ecological impact of construction. When magnesium oxide reacts with potassium dihydrogen phosphate (KH2PO4) (KDP) in presence of water, crystallization of magnesium potassium phosphate hydrate (MKP) occurs, according to the reaction: MgO + KH2PO4 + 5H2O --> MgKPO4·6H2O. Despite the importance of MPC for a wide range of applications, including rapid concrete repair, recycling of hazardous wastes, waste encapsulation, bone repair, natural fibre composites, no data are available on hydration reaction kinetics.
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4th Reaction Kinetics, Part III, Final Research Report, Task A, Project FT-TA/039, 2006.
Chyba, V. ; Tukač, V. ; Hanika, Jiří ; Šimíčková, M. ; Lederer, J. ; Kolena, J. ; Šimek, J. ; Jiřičný, Vladimír ; Sazanov, Z.
Determination of hydrogenation reaction kinetics of styrene, DCPD and and heavy gasoline fraction in Trickle bed reactor.
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