National Repository of Grey Literature 3 records found  Search took 0.00 seconds. 
Distribution of platinum group elements in soils of Prague and Ostrava
Durajová, Marie ; Mihaljevič, Martin (advisor) ; Vaněk, Aleš (referee)
Automobile catalysts reduce emissions of CO, NOx a CmHm from combustion engines. At the same time, the automotive catalysts produce emissions of platinum group elements (PGE). Automotive catalysts were designed especially on the basis of Pt and later became an important metal Pd. The main objective of this study is monitoring of distribution of metals Pt, Pd in the soils of municipal parks in two large cities Prague and Ostrava. Soils samples were taken from three depths levels (0-10, 10-20 and 20-30 cm) under crowns of vegetation and at the open site. Then followed docimastic separation into NiS and sample analysis using by ICP-MS. The highest contents of Pt and Pd were determined in Prague in a open site at a depth of 0-10 cm - 159.5 ug/kg for Pt and 49.79 ug/kg for Pd at the Karlovo namesti. Several major road junctions which daily passes a large number of cars are located at this site. The maximum contents of PGE were much lower in the Ostrava then in Prague. The highest content of Pt (3.24 ug/kg) was measured at a depth of 0-10 cm under the crowns of vegetation at the Sad M. Horakove site. The highest content of Pd (0.91 ug/kg) was measured at a depth of 0-10 cm at the open site of the Komenske sady site. At some locations, the maximum PGE concentrations were observed in deeper parts of the profile....
Estimation of Migration Parameters of Rocks with Fracture Permeability using Fluorescent Solutions : Research Report considering Work Progress and Results Achieved in 2013 Intermediate Report Covering the I. Phase : bibliography and preparatory works
Lachman, V. ; Kovářová, R. ; Novák, P. ; Rohovec, Jan ; Vašíček, R. ; Frydrych, V. ; Patzelt, Z. ; Šigut, R. ; Vachudová, L. ; Durajová, M. ; Koděrová, K.
The proposed project focusing on the use of fluorescent properties during tracer tests reflects the absecne of tracer substances not modifying the hydrochemical properties of the environment and not being radioactive. A positive result of the proposed research will enable more accurate evalutation of absorption properties of the rock environment in case of leakage of hazardous substances than it is for chemical tracers. Fluorescence salts offer the possibility of continuous monitoring of fluorescence changes without endangering the environment and without negative effects on hydrochemistry. Research will proceed according the fillowith scheme: bibliography-laboratory research-field tests-mathematical modeling. The project proposer has already acquired a patent and design rights in the frame of previous research project concerning the developed facility and technology enabling continuous monitoring and evaluation of fluorescence changes in liquids. The investigation of interaction between fluorescent salts and migratory pproperties of the rock environment will focus on rock with fracture permeability. Further selection of fluorescence salts accomplishing the objectives of the project will be based on the detailed bibliographic study. Particular fluorescent salts will be investigated in laboratory scale on selected rocs. Most promising fluorescence solutions will be consequently used for migration tests in specified rock environment with fracture permeability. The research polygon will be equipped with small-diameter boreholes interconnected by fracture network with two network section - with and without sorption properties. The results of both, laboratory and field tests, will be validated by mathematical models.

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2 Durajová, Marie
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