National Repository of Grey Literature 60 records found  previous11 - 20nextend  jump to record: Search took 0.01 seconds. 
Determination of levoglucosan and dehydroabietic acid in urban aerosol
Coufalík, Pavel ; Čmelík, Richard ; Křůmal, Kamil ; Čapka, Lukáš ; Mikuška, Pavel
The analytical method involving aerosol sampling into water, quantitative pre-concentration of levoglucosan and dehydroabietic acid, and their determination by LC-MS was developed in this work.
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.
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.
Analysis of Organic Markers for Identification of Sources of Atmospheric Aerosols
Křůmal, Kamil ; Chýlková, Jaromíra (referee) ; Vávrová, Milada (referee) ; Smolík,, Jiří (referee) ; Večeřa, Zbyněk (advisor)
In this work the organic markers that serve for identification of sources of aerosols are monitored. Theoretic part deals with detailed survey of organic markers emitted from the most significant sources of atmospheric aerosols (biomass combustion, combustion of fossil fuels and traffic) as well as with sampling of aerosols and analysis of organic markers by analytical techniques. Monosaccharide anhydrides (emissions from biomass combustion) and polyaromatic hydrocarbons (emissions from traffic and incomplete combustion) were observed especially. Hopanes and steranes (traffic, coal combustion) and fatty acids (cooking) were next groups of monitored organic markers. Markers were studied mainly in size fraction PM1 because this fraction of aerosols is the most harmful to human health. Aerosols were sampled in two seasons (winter and summer) in two towns in 2009. Higher concentrations of aerosols and organic compounds were found in winter season, which resulted from increased combustion of biomass, coal and other organic material while traffic was the most significant source of aerosols in summer.
Diurnal changes of monoterpene fluxes in Norway spruce forest
Juráň, Stanislav ; Fares, S. ; Křůmal, Kamil ; Večeřa, Zbyněk ; Urban, Otmar
Biogenic volatile organic compounds (BVOCs) are important components of biosphere–atmosphere exchange. Their emissions depend on various meteorological parameters and stresses. Diurnal fluxes of different monoterpenes were studied within a Norway spruce (Picea abies) mountain forest to investigate their dependence on temperature and global radiation. Fluxes of monoterpenes, the most abundant BVOCs in spruce, were modelled using an inverse Lagrangian transport model, and representative diurnal variation trigged by both temperature and light was observed. This research enables future parametrization and quantification of various factors driving bidirectional fluxes.
Metal concentrations in urban aerosol in Brno and in exhaust fumes
Coufalík, Pavel ; Mikuška, Pavel ; Křůmal, Kamil ; Vojtíšek, M. ; Matoušek, Tomáš ; Večeřa, Zbyněk
Total metal concentrations in aerosol samples and exhaust fumes as well as the bioaccessibility of metals in simulated lung fluids were determined. The extraction in vitro seems not to be dependent on the surface tension of extraction solution.
Metals concentrations in urban aerosol and in exhaust emission
Coufalík, Pavel ; Mikuška, Pavel ; Křůmal, Kamil ; Vojtíšek, M. ; Matoušek, Tomáš ; Večeřa, Zbyněk
Total metals concentrations in aerosol samples and exhaust fumes as well as the bioaccessible proportions of metals were determined. The bioaccessibility of metals in vitro should be assessed according to the extraction in simulated lung fluids with a low surface tension.

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