National Repository of Grey Literature 26 records found  1 - 10nextend  jump to record: Search took 0.00 seconds. 
Arsenic speciation in mining wastes - case studies in systems dominated by ferric sulfo-arsenates
Jelenová, Helena ; Drahota, Petr (advisor) ; Filippi, Michal (referee) ; Jurkovič, Ľubomír (referee)
The aim of the thesis is to study behavior and mineralogy of arsenic in mine wastes with high levels of FeIII and SVI . Three methodological studies are related to (i) identification and characterization of secondary arsenic phases using a Raman spectrometry, (ii) chemical fractionation of arsenic in mine waste materials as observed by optimized sequential extraction, (ii) and investigation of thermodynamic properties of zýkaite. The mineralogy and mobility of arsenic was studied in mine waste material of five dumps located at three sites (Kaňk near Kutná Hora, Jedová jáma near Vejprty, and Dlouhá Ves) and in stalactite samples from two abandoned underground mines (Plavno and Mikulov near Teplice). Mineralogical and geochemical characterization of samples included standard methods and techniques. Chemical composition of solid and liquid (pore water, leachates) samples was performed using a XRF, ICP OES, ICP MS, etc. X-ray diffraction, Raman spectrometry and electron microscope equipped with microanalysis were the most frequent techniques used for mineralogical characterization of the solids. The results showed that the speciation of arsenic in the solid phase significantly varied among the studied sites and was a function of total concentration as well as proportion of the major components of...
Indium in the environment
Kulakowski, Ondřej ; Drahota, Petr (advisor) ; Filippi, Michal (referee)
This bachelor thesis is focused on the presence, bonds and concentration of indium in various spheres of the environment. It presents a comprehensive overview of the distribution of indium in rocks, waters, air and organisms, its concentrations, speciation, mobility and refers to its toxicity. It also provides the basic physical and chemical properties of indium and its compounds, mineralogy and geochemistry. The major Czech and world deposits are reported. At the end it devotes significant world producers of indium, and also mentions recycling procedures of this element. Powered by TCPDF (www.tcpdf.org)
Contribution to arsenic solid phase speciation in soils and mine wastes
Filippi, Michal ; Pertold, Zdeněk (advisor) ; Zeman, Josef (referee) ; Chovan, Martin (referee)
N1ichó] F] ]ppi Abotract Sunrnrar 1, ,tf Dtssertdtron The presentď dlssertat|on attempts to contrlbute to the current know|edge on the arsen|c (As) m|n€ra|og|ca| spec|at|on |n diverse types of so||d materta|s, such as contam|nated solls and mlne wastes. . lntřoductory part of the d|ssértat|on prov|des a geneftr| |ntroduct|on to As chemlca| and physlcal characterlstlcs and to the behavlor In the environment, wlth the maln emphasls on As so||d phase spec|aíon ln so||s and m|ne wast€s. . Next part of thé d|ssertat|on summar|zes and br|efly eva|uates m|nera|ogka| Ínethods to the study of prlmary and secondary As-bearlng phases. The maln alm ts to help wlth better or|ental|on |n the app||cat|on of these methods. The ||terauJre rď|en, showed thát áhhough a rank of modem methods have been developed |n |ast years (HMDF-STEM, AFM, BFM, PÍxE, xAs techn|ques, ND, etc.), there rema|n severá| estab||shď rnethďs (xRD, sEM, etc.) as a startlng step br mlneraloglcal research. Some other group of methods has been found as posslble useful for the study of As solld phase spechtlon (e,9,, RS, DTA, TGA, Vts DRS, VMp), The ma|n part of the d|ssertat|on |s pr€s€nted as a s€t of three papeni on shllar subjccts pub||shed |n scienťflc Journa|s - Env|ronÍrEnta| Cieo|ogy, sc|ence of the Tota| Env|ronrnent and Geoderma, The fu||ow|ng...
Contribution to arsenic solid phase speciation in soils and mine wastes
Filippi, Michal ; Pertold, Zdeněk (advisor) ; Zeman, Josef (referee) ; Chovan, Martin (referee)
N1ichó] F] ]ppi Abotract Sunrnrar 1, ,tf Dtssertdtron The presentď dlssertat|on attempts to contrlbute to the current know|edge on the arsen|c (As) m|n€ra|og|ca| spec|at|on |n diverse types of so||d materta|s, such as contam|nated solls and mlne wastes. . lntřoductory part of the d|ssértat|on prov|des a geneftr| |ntroduct|on to As chemlca| and physlcal characterlstlcs and to the behavlor In the environment, wlth the maln emphasls on As so||d phase spec|aíon ln so||s and m|ne wast€s. . Next part of thé d|ssertat|on summar|zes and br|efly eva|uates m|nera|ogka| Ínethods to the study of prlmary and secondary As-bearlng phases. The maln alm ts to help wlth better or|ental|on |n the app||cat|on of these methods. The ||terauJre rď|en, showed thát áhhough a rank of modem methods have been developed |n |ast years (HMDF-STEM, AFM, BFM, PÍxE, xAs techn|ques, ND, etc.), there rema|n severá| estab||shď rnethďs (xRD, sEM, etc.) as a startlng step br mlneraloglcal research. Some other group of methods has been found as posslble useful for the study of As solld phase spechtlon (e,9,, RS, DTA, TGA, Vts DRS, VMp), The ma|n part of the d|ssertat|on |s pr€s€nted as a s€t of three papeni on shllar subjccts pub||shed |n scienťflc Journa|s - Env|ronÍrEnta| Cieo|ogy, sc|ence of the Tota| Env|ronrnent and Geoderma, The fu||ow|ng...
Salt precipitation in subsurface zone of sandstone and other porous rocks and simulation of water transport and evaporation
Sommerová, Anna ; Bruthans, Jiří (advisor) ; Filippi, Michal (referee)
The main goal of this thesis was to find and compare salt-forming ions from samples of a subsurface zone of sandstone and other porous rocks. The surveyed samples came from different environments (humid and arid climate) from different locations in the Czech Republic, Jordan and the United States of America. Identification of various types of salt was based on evaluation of chemical analyzes of leached samples. Furthermore a laboratory experiment in which I used a fluorescein dye to observe the capillary rise and evaporation in unsaturated samples of sandstone was carried out. The salt content in the Czech Republic humid environment locations is generally lower than the one in foreign arid climate locations. Halit dominates in the locations Petra and Crystal Peak. In the other locations sulphate minerals dominate. The salts containing aluminum - alums were determined in the Czech Republic in the area of Czech Paradise and the surrounding. Relatively high concentrations of nitrate mineral nitratine were identified in the Devil's Pulpit location in Pilsen, the Czech Republic. From the observation of capillary rising experiments performed with artificially created honeycombs, I conclude that the height of the capillary rise is crucial for the transport of solution, and at a certain capillary height,...

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2 Filippi, Michaela
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