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Determination of inorganic anions in air by modernized aerosol sampler
Čapka, Lukáš; Mikuška, Pavel; Večeřa, Zbyněk
2017 - Czech
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. Spojení původního vzorkovače ACTJU s kondenzační růstovou jednotkou na bázi vody (CGU), umístěné před ACTJU, umožnilo vzorkovat částice aerosolu o rozměrech v řádech nanometrů. Odtah z ACTJU je kontinuálně odsáván a v něm obsažené vodou rozpustné sloučeniny online analyzovány pomocí iontové chromatografie.
Keywords:
CGU-ACTJU sampler; on-line analysis; atmospheric aerosol
Available at various institutes of the ASCR
Determination of inorganic anions in air by modernized aerosol sampler
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 ...
Characterization of organic compounds in PM1aerosol in Kosetice and Brno in winter season 2017
Křůmal, Kamil; Mikuška, Pavel; Večeřa, Zbyněk
2017 - Czech
In this work, the organic compounds and organic markers used for the identification of sources of aerosols were measured. Monosaccharide anhydrides and resin acids (emissions from biomass combustion) and polycyclic aromatic hydrocarbons (emissions from traffic and incomplete combustion) were observed especially. Hopanes, steranes (traffic, coal combustion) and alkanes were next groups of analysed organic compounds. V této práci byly měřeny organické sloučeniny a markery, které slouží pro identifikaci zdrojů atmosférických aerosolů. Byly analyzovány anhydridy monosacharidů (emise ze spalování biomasy), polycyklické aromatické uhlovodíky (emise z dopravy a nedokonalého spalování), hopany a sterany (doprava, spalování uhlí) a alkany.
Keywords:
atmospheric aerosol; PM1; organic markers
Available at various institutes of the ASCR
Characterization of organic compounds in PM1aerosol in Kosetice and Brno in winter season 2017
In this work, the organic compounds and organic markers used for the identification of sources of aerosols were measured. Monosaccharide anhydrides and resin acids (emissions from biomass combustion) ...
Organic compounds in PM1 aerosol in Kladno-Svermov in winter 2017
Křůmal, Kamil; Mikuška, Pavel; Večeřa, Zbyněk
2017 - Czech
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. Tato práce se zabývá stanovením organických sloučenin a markerů používaných pro identifikaci hlavních emisních zdrojů v PM1 aerosolu v malém městě Kladně-Švermově. Nejvyšší koncentrace byly pro anhydridy monosacharidů a pryskyřičné kyseliny (spalování biomasy). Dalšími analyzovanými skupinami organických sloučenin a markerů byly polycyklické aromatické uhlovodíky (emise z dopravy a nedokonalého spalování), hopany (spalování uhlí, doprava), sterany (doprava), sacharidy a alkany.
Keywords:
monosaccharide anhydrides; hopanes; polycyclic aromatic hydrocarbons
Fulltext is available at external website.
Organic compounds in PM1 aerosol in Kladno-Svermov in winter 2017
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. ...
Comparison of chemical composition of aerosol particles in emissions from combustion of wood
Křůmal, Kamil; Mikuška, Pavel; Horák, J.; Hopan, F.
2017 - Czech
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. Tato práce se zabývá porovnáním emisních faktorů částic, polycyklických aromatických uhlovodíků a organických markerů ze spalování dřeva a uhlí ve čtyřech kotlích používaných k vytápění domácností v ČR. Spalovací zkoušky byly provedeny se sníženým výkonem kotlů (nedokonalé hoření), což lépe odráží reálné emise ze spalování tuhých paliv v domácnostech.
Keywords:
biomass combustion; coal combustion; PAHs
Fulltext is available at external website.
Comparison of chemical composition of aerosol particles in emissions from combustion of wood
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 ...
Determination of methylmercury in lichens and cyanobacterial mat by GC-AFS
Coufalík, Pavel; Meszarosová, N.; Coufalíková, K.; Zvěřina, O.; Komárek, J.
2017 - Czech
The aim of this research was a development of the analytical method suitable for the determination of trace concentration of methylmercury in the ecosystem of Antarctic lakes. The determination of mercury bioaccumulation in cyanobacterial mat (the colonies of algae and cyanobacteria) stands in focus as well. Cílem tohoto výzkumu byl vývoj analytické metody vhodné pro stanovení stopových koncentrací methylrtuti v ekosystému antarktických jezer a určení míry bioakumulace rtuti v cyanobakteriálních povlacích (kolonie řas a sinic).
Keywords:
methylmercury; GC-AFS; Antarctica
Available in digital repository of the ASCR
Determination of methylmercury in lichens and cyanobacterial mat by GC-AFS
The aim of this research was a development of the analytical method suitable for the determination of trace concentration of methylmercury in the ecosystem of Antarctic lakes. The determination of ...
Characterization of organic compounds in PM1 aerosol in Kladno in winter 2016
Křůmal, Kamil; Mikuška, Pavel; Večeřa, Zbyněk
2016 - Czech
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. Organické sloučeniny a markery používané pro identifikaci hlavních emisních zdrojů byly měřeny v PM1 aerosolu v malém městě Kladně-Švermově. Nejvyšší koncentrace byly pro anhydridy monosacharidů a pryskyřičné kyseliny (spalování biomasy). Dalšími analyzovanými skupinami organických sloučenin a markerů byly polycyklické aromatické uhlovodíky (emise z dopravy a nedokonalého spalování), hopany (spalování uhlí, doprava), sterany (doprava), sacharidy a alkany.
Keywords:
organic tracer; urban aerosol; PM1
Available in digital repository of the ASCR
Characterization of organic compounds in PM1 aerosol in Kladno in winter 2016
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 ...
Increase of efficiency of continuous aerosol sampler
Mikuška, Pavel; Čapka, Lukáš; Večeřa, Zbyněk
2016 - Czech
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. Příspěvek se zabývá zvýšením účinnosti záchytu ACTJU vzorkovače i pro částice menší než 300 nm. Použitím tzv. „růstové trubky“ (RT), která je umístěna před vzorkovačem, vzroste velikost částic na několik µm a zvětšené částice jsou pak snadno kvantitativně zachyceny v ACTJU vzorkovači.
Keywords:
continuous sampler; on-line analysis; atmospheric aerosol
Available in digital repository of the ASCR
Increase of efficiency of continuous aerosol sampler
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 ...
Allelopathy of root exudates of common ragweed (Ambrosia artemisiifolia L.)
Figala, J.; Lojková, L.; Lvončík, S.; Hohnová, Barbora; Moravcová, Dana; Formánek, P.
2015 - Czech
Invasive plant Ambrosia artemisiifolia (Asteraceae) of North American origin is an important agricultural weed in Europe and also occupies large non-crop areas with a range that is likely to accelerate under climate change. Its pollen grains are noxious aeroallergens and cause summer hay fever. Knowledge on allelopathic effect of root exudates of Ambrosia artemisiifolia on germination and growth of plant species are presented in this work. Ambrózie peřenolistá (Ambrosia artemisiifolia L.) pochází ze Severní Ameriky a do Evropy byla zavlečena ve druhé polovině 19. století. Ambrózie peřenolistá je plevelem polních plodin a producentem značného množství vysoce alergenního pylu. V předložené práci jsou prezentovány poznatky o alelopatickém působení kořenových výměšků (exsudátů) ambrózie peřenolisté na klíčení a růst vybraných druhů rostlin.
Keywords:
root exudates; allelopathy; common ragweed
Available in digital repository of the ASCR
Allelopathy of root exudates of common ragweed (Ambrosia artemisiifolia L.)
Invasive plant Ambrosia artemisiifolia (Asteraceae) of North American origin is an important agricultural weed in Europe and also occupies large non-crop areas with a range that is likely to ...
Composition of particles and gases in emissions of spark ingnition engines: effect of operation cycles and alcohol fuels
Mikuška, Pavel; Křůmal, Kamil; Coufalík, Pavel; Vojtíšek-Lom, M.; Beránek, V.; Štolcpartová, Jitka; Večeřa, Zbyněk
2015 - Czech
Chemical composition of particles and gaseous compounds in emissions of spark-ignition engine depends on operation cycle and the method of formation of the fuel mixture. Particulate emissions (both particle mass and especially particle number concentration) were significantly higher at engine with the direct formation of mixture (engine DISI) than at engine with indirect formation of the mixture (MPI), and were affected both by the operating conditions and by the fuel used. Chemické složení částic a plynných sloučenin v emisích zážehového motoru závisí na provozním režimu, způsobu tvorby palivové směsi a použitém palivu. Emise částic (jak hmotnostní koncentrace, tak zejména početní koncentrace částic) byly u motoru s přímou tvorbou směsi (motor DISI) výrazně vyšší než u motoru s nepřímou tvorbou směsi (MPI).
Keywords:
spark ignition engine; emission composition; DISI and MPI engine
Available in digital repository of the ASCR
Composition of particles and gases in emissions of spark ingnition engines: effect of operation cycles and alcohol fuels
Chemical composition of particles and gaseous compounds in emissions of spark-ignition engine depends on operation cycle and the method of formation of the fuel mixture. Particulate emissions (both ...
Metals concentrations in urban aerosol and in exhaust emission
Coufalík, Pavel; Mikuška, Pavel; Křůmal, Kamil; Vojtíšek, M.; Matoušek, Tomáš; Večeřa, Zbyněk
2015 - Czech
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. V rámci tohoto výzkumu byly sledovány celkové koncentrace kovů ve vzorcích aerosolu a motorových emisích a byly určovány jejich biodostupné podíly. Biodostupnost kovů in vitro by měla být posuzována pomocí extrakce v simulovaných plicních kapalinách s nízkým povrchovým napětím.
Keywords:
PM1; metals; bioavailability
Available in digital repository of the ASCR
Metals concentrations in urban aerosol and in exhaust emission
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 ...
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