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National Repository of Grey Literature 12 records found  previous11 - 12  jump to record: Search took 0.01 seconds. 
Needles as bioindicators for assessing contamination levels of PAHs
 Mikulíková, Iva ; Zlámalová Gargošová, Helena (referee) ; Vávrová, Milada (advisor)
Bioindicators are used to monitor the level of the environmental pollution. Plant bioindicators are most frequently used, particularly mosses, lichens and conifers. This thesis focuses of the monitoring of polycyclic aromatic hydrocarbons alkyl-derivates concentration in the needles, that were taken in different locations in the Czech Republic. Analytes were extracted by mixture of n-hexane and dichlormethane. The acquired extract was cleaned up by column chromatography with activated silicagel and florisil. Gas chromatography - mass spectrometry was used for final analysis.
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Analysis of tar formed by combustion of biomass
 Chytil, Václav ; Čáslavský, Josef (referee) ; Vávrová, Milada (advisor)
This bachelor's thesis is focused on the analysis of the tar formed during combustion of biomass. Samples of the tar were provided by Energy Institute, Faculty of Mechanical Engineering, Brno University of Technology. BTEX, polycyclic aromatic hydrocarbons (PAHs) and n-alkanes were chosen as groups of target compounds. Samples (tar solutions in acetone) were refined before the final analysis. In the case of BTEX and n-alkanes, only filtration and dilution were used. In the case of polycyclic aromatic hydrocarbons, samples were filtered and then cleaned-up by column chromatography using silica gel. Gas chromatography with flame ionization detector (GC-FID) was chosen as an appropriate analytical method for the determination of target compounds from selected groups of BTEX and n-alkanes. Target compounds from the group of polycyclic aromatic hydrocarbons were determined by gas chromatography with mass spectrometric detection (GC-MS).
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National Repository of Grey Literature : 12 records found   previous11 - 12  jump to record:
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