National Repository of Grey Literature 108 records found  previous11 - 20nextend  jump to record: Search took 0.00 seconds. 
Determination of inorganic anions in air by modernized aerosol sampler
Čapka, Lukáš ; Mikuška, Pavel ; Večeřa, Zbyněk
Combination of original ACTJU sampler with water-based condensation growth unit (CGU) located upstream of the ACTJU allows quantitative sampling of aerosol particles down to a few nm in diameter. The ACTJU effluent is permanently sucked out from the sampler and online analysed for particulate water-soluble species by ion chromatography.
Aerosol size distribution of PAH in urban atmosphere
Bendl, Jan ; Hovorka, Jan (advisor) ; Mikuška, Pavel (referee)
The aim of the study was to determine the 13 health risk PAHs (phenanthrene, anthracene, fluoranthene, pyrene, benzo(a)anthracene, chrysene, benzo(b)fluoranthene, benzo(k)fluoranthene, benzo(a)pyrene, dibenzo(a,h)anthracene, benzo(g,h,i)perylene, ideno(1,2,3-cd)perylene and coronene; c-PAU highlighted) in the fractions of size-segregated aerosol of the urban air in Ostrava (2012, 2014) and Mlada Boleslav (2013) at low temperatures in winter, and to verify experimentally a sampling artifact, i.e., to quantify PAHs in the gas phase. For the particle size separation high-volume cascade impactor Hi-Vol BGI 900 was used. PAHs were determined by HPLC-FLD/PDA. In Ostrava in 2012 during the winter inversion (up to -25 řC), mean concentration of 13 PAHs in aerosol was 432 ng.m-3 ; in fraction 10 - 1 µm 119 ng.m-3 , 1 - 0,5 µm 185 ng.m-3 , 0,5 - 0,17 µm 91 ng.m-3 , in fraction < 0,17 µm 37 ng.m-3 and in the gaseous phase of min. 40 ng.m-3 . In the most unfavorable day 2. 2. 2012 (-18.6 ř C) reached the 24-hour average of 13 PAHs 890 ng.m-3 , the sum of carcinogenic PAHs 237 ng.m-3 and benzo(a)pyrene 32.3 ng.m-3 . An irregular and different decline of PAHs concentrations after inversion was measured: in fraction 1 - 10 µm 2.8 times, 0.5 - 1 µm 4.2 times, 0.5 - 0.17 µm 4 times and for <0.17 µm up to 7.6 times....
Source Apportionment of Atmospheric Aersol Using by Highly Time Resolved Characterization.
Pokorná, Petra ; Hovorka, J. ; Klán, M. ; Křůmal, Kamil ; Mikuška, Pavel ; Hopke, P.K. ; Ždímal, Vladimír
The effective air quality management in the heavy polluted areas has to be based on high-quality monitoring with properly designed monitoring network and targeted measurements, which provided information required to source apportionment. The study aim was to apportion sources of atmospheric aerosol based on highly time resolved data of mass concentration of size segregated aerosol, its spatial variability, elemental composition and OC/EC at three localities in the Czech Republic in the years 2008 – 2010, 2012, 2013. According to the size fractions ratio arose the importance of PM1 source apportionment because of PM0.15-1.15 mean ratio to PM10, which comprised 85 % at the monitoring localities primarily in winter. The main sources of coarse fraction in winter were coal and biomass combustion in Březno by Chomutuv a Mladá Boleslav and road dust re-suspension in Ostrava-Ravanice and Bartovice. In summer dominated soil re-suspension and primary biological – bioaerosol in Březno by Chomutuv. The dominated source of fine fraction was in winter coal combustion Ostrava-Ravanice and Bartovice and biomass burning in Mladá Boleslav. From the above mentioned results arose, that the highly time resolved data are suitable for source identification of size segregated atmospheric aerosol and enable to evaluate representativeness of monitoring station location and measurement campaign.
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Organic compounds in PM1 aerosol in Kladno-Svermov in winter 2017
Křůmal, Kamil ; Mikuška, Pavel ; Večeřa, Zbyněk
The work deals with the measurement of organic compounds and organic markers used for the identification of main aerosol sources in PM1 aerosol in a small town (Kladno-Švermov) near Prague. Monosaccharide anhydrides and resin acids (emissions from biomass combustion) were found especially. Polycyclic aromatic hydrocarbons (emissions from traffic and incomplete combustion), hopanes (traffic, coal combustion), steranes (traffic), saccharides and alkanes were other groups of analysed organic compounds.
Comparison of chemical composition of aerosol particles in emissions from combustion of wood
Křůmal, Kamil ; Mikuška, Pavel ; Horák, J. ; Hopan, F.
The work deals with the comparison of emission factors of particles, polycyclic aromatic hydrocarbons and organic markers from combustion of wood and coal in four boilers used for household heating in the Czech Republic. Combustion experiments were performed with reduced output of boilers (incomplete combustion) which showed real emissions from combustion of solid fuels in households.
Increase of efficiency of continuous aerosol sampler
Mikuška, Pavel ; Čapka, Lukáš ; Večeřa, Zbyněk
Contribution deals with increasing of collection efficiency of ACTJU sampler also for particles smaller than 300 nm in diameter. Use of so-called „growth tube“ (GT) located upstream of the ACTJU results in increase of particle size to several µm. Enlarged particles are then easily quantitative collected in ACTJU sampler.
Characterization of organic compounds in PM1 aerosol in Kladno in winter 2016
Křůmal, Kamil ; Mikuška, Pavel ; Večeřa, Zbyněk
In this work the organic compounds and organic markers used for the identification of main aerosol sources were measured in PM1 aerosol in a small town (Kladno-Švermov) near Prague. Monosaccharide anhydrides and resin acids (emissions from biomass combustion) were found especially. Polycyclic aromatic hydrocarbons (emissions from traffic and incomplete combustion), hopanes (traffic, coal combustion), steranes (traffic), saccharides and alkanes were other groups of analysed organic compounds.
Organic markers and compounds in PM1 aerosol in small town near Prague (Czech Republic) in winter 2016
Křůmal, Kamil ; Mikuška, Pavel ; Coufalík, Pavel ; Večeřa, Zbyněk
Contribution summarizes the concentrations of monosaccharide anhydrides, resin\nacids, methoxyphenols, monosaccharides, disaccharides, sugar alcohols, alkanes,\nhopanes, steranes and polycyclic aromatic hydrocarbons in PM1 aerosols in small town\nKladno-Švermov in winter. According to concentrations of organic markers, the\nidentification of emission sources in Kladno-Švermov is discussed.
Combined effect of temperature and CdO nanoparticles treatment on Picea abies
Večeřová, Kristýna ; Mikuška, Pavel ; Oravec, Michal ; Kozáčiková, Michaela ; Pompeiano, Antonio ; Coufalík, Pavel ; Urban, Otmar
Three-years old seedlings of Picea abies were pre-treated under two different\ntemperatures (20x35 °C) and subsequently exposed to elevated concentration of CdO\nnanoparticles (CdONPs). Two-week exposure to airborne CdONPs of ecologically\nrelevant size and concentration significantly reduced photosynthetic light use efficiency\nin plants as well as contents of photosynthetic pigments and saccharides. In contrary,\namino acid content was increased under CdONPs. These changes were further\nmodulated by previous growth temperature.
Determination of levoglucosan in urban aerosol
Coufalík, Pavel ; Mikuška, Pavel ; Čmelík, Richard
The main aim of this work was a development of the analytical method for levoglucosan\ndetermination including direct collection of aerosol into water phase, preconcentration,\nand determination by LC-MS.

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