Number of found documents: 451
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Photochemical vapor generation of cobalt for detection by inductively coupled plasma mass spectrometry
Vyhnanovský, Jaromír; Musil, Stanislav
2020 - English
Volatile species of cobalt were generated in a flow-injection system, employing a high-efficiency flow-through UV photoreactor and a formic acid based medium. Optimal generation conditions were found as 10% (v/v) formic acid and 4 mol/L ammonium formate at a flow rate of 4 ml/min. Keywords: photochemical vapor generation; cobalt; inductively coupled plasma mass spectrometry Available in digital repository of the ASCR
Photochemical vapor generation of cobalt for detection by inductively coupled plasma mass spectrometry

Volatile species of cobalt were generated in a flow-injection system, employing a high-efficiency flow-through UV photoreactor and a formic acid based medium. Optimal generation conditions were found ...

Vyhnanovský, Jaromír; Musil, Stanislav
Ústav analytické chemie, 2020

Photon-upconversion scanner for multiplexed imaging
Hlaváček, Antonín; Křivánková, Jana; Foret, František
2020 - English
In analytical chemistry, multiplexed assays facilitate parallel detection of analytes. The multiplexing reduces the consumption of sample, reagents, and other resources and can be applied for medical diagnostics, the studies of biomolecule interactions, single-cell and singlemolecule assays, environmental monitoring, pathogen detection, multiparameter chemical and biological assays and screening of chemical libraries. Keywords: photon-upconversion scanner; photon-upconversion nanoparticles; droplet microfluidics Fulltext is available at external website.
Photon-upconversion scanner for multiplexed imaging

In analytical chemistry, multiplexed assays facilitate parallel detection of analytes. The multiplexing reduces the consumption of sample, reagents, and other resources and can be applied for medical ...

Hlaváček, Antonín; Křivánková, Jana; Foret, František
Ústav analytické chemie, 2020

Photochemical vapour generation coupled with atomic fluorescence spectrometry
Štádlerová, Barbora; Vyhnanovský, Jaromír; Dědina, Jiří; Musil, Stanislav
2020 - English
Atomization of bismuthane in the flame-in-gas-shield atomizer by photochemical vapour generation coupled with atomic fluorescence spectrometry. Keywords: atomic fluorescence spectrometry; bismuth; photochemical vapour generation Available in digital repository of the ASCR
Photochemical vapour generation coupled with atomic fluorescence spectrometry

Atomization of bismuthane in the flame-in-gas-shield atomizer by photochemical vapour generation coupled with atomic fluorescence spectrometry.

Štádlerová, Barbora; Vyhnanovský, Jaromír; Dědina, Jiří; Musil, Stanislav
Ústav analytické chemie, 2020

Chemical vapor generation of cadmium for analytical atomic spectrometry
Sagapova, Linda; Kodríková, Barbora; Svoboda, Milan; Musil, Stanislav; Kratzer, Jan
2020 - English
Chemical vapor generation of cadmium volatile compounds was optimized, several reaction modifiers based on inorganic salts and complexes of CrIII+, CoII+, TiIII+, TiIV+ were tested. Their use resulted in 4-5 times enhancement in sensitivity, reflected also in corresponding increase of generation efficiency and better repeatability. Generation efficiency was determined from a comparison between sensitivities obtained with chemical vapor generation and conventional solution nebulization, both simultaneously coupled with inductively coupled plasma mass spectrometry. The identity of the generated cadmium compounds was identified. Keywords: cadmium; chemical vapor generation; atomic absorption spectrometry Available in digital repository of the ASCR
Chemical vapor generation of cadmium for analytical atomic spectrometry

Chemical vapor generation of cadmium volatile compounds was optimized, several reaction modifiers based on inorganic salts and complexes of CrIII+, CoII+, TiIII+, TiIV+ were tested. Their use resulted ...

Sagapova, Linda; Kodríková, Barbora; Svoboda, Milan; Musil, Stanislav; Kratzer, Jan
Ústav analytické chemie, 2020

Determination of fast changes in concentrations of volatile organic compounds using diffusion denuder
Křůmal, Kamil; Mikuška, Pavel
2019 - Czech
Determination of fast changes in concentrations of volatile organic compounds was performed using wet effluent diffusion denuder, which allows collection of samples in 2-min intervals. Stanovení rychlých změn koncentrací těkavých organických sloučenin bylo provedeno využitím difúzního denuderu se stékajícím filmem kapaliny, který umožňuje odběr vzorků v časových intervalech již od 2 minut. Keywords: monoterpenes; BTEX; denuder Available in digital repository of the ASCR
Determination of fast changes in concentrations of volatile organic compounds using diffusion denuder

Determination of fast changes in concentrations of volatile organic compounds was performed using wet effluent diffusion denuder, which allows collection of samples in 2-min intervals.

Křůmal, Kamil; Mikuška, Pavel
Ústav analytické chemie, 2019

Hydride generation in connection with inductively coupled plasma mass spectrometry
Matoušek, Tomáš
2019 - Czech
An overview describing technique of volatile hydride generation in connection with inductively coupled plasma mass spectrometry including speciation analysis. Přehledný text popisující využití techniky generování těkavých hydridů v hmotnostní spektrometrií s indukčně vázaným plazmatem včetně speciačních analýz. Keywords: hydride generation; ICP-MS; speciation analysis Available at various institutes of the ASCR
Hydride generation in connection with inductively coupled plasma mass spectrometry

An overview describing technique of volatile hydride generation in connection with inductively coupled plasma mass spectrometry including speciation analysis.

Matoušek, Tomáš
Ústav analytické chemie, 2019

Organic compounds and markers from coal combustion in different types of boilers used for household heating
Křůmal, Kamil; Mikuška, Pavel; Horák, J.; Hopan, F.
2019 - Czech
Organic compounds (polycyclic aromatic hydrocarbons) and organic markers (hopanes) used for the identification of aerosol emission sources were measured in emissions from the combustion of hard and brown coal. Coal was combusted in different\nboilers used for residential heating in the Czech Republic, i.e., overfire boiler, boiler with down-draft combustion and automatic boiler. Organické sloučeniny (polycyklické aromatické uhlovodíky) a organické markery (hopany) používané pro identifikaci zdrojů aerosolů byly měřeny v emisích ze spalování černého a hnědého uhlí. Uhlí bylo spalováno v různých kotlích používaných pro vytápění domácností v České republice, tj. prohořívací, odhořívací a automatický kotel. Keywords: household heating; coal combustion; hopanes Available in digital repository of the ASCR
Organic compounds and markers from coal combustion in different types of boilers used for household heating

Organic compounds (polycyclic aromatic hydrocarbons) and organic markers (hopanes) used for the identification of aerosol emission sources were measured in emissions from the combustion of hard and ...

Křůmal, Kamil; Mikuška, Pavel; Horák, J.; Hopan, F.
Ústav analytické chemie, 2019

Effect of metal sensitizers on photochemical vapor generation of bismuth for analytical atomic spectrometry
Vyhnanovský, Jaromír; Yildiz, D.; Musil, Stanislav
2019 - English
Three new sensitizers with a significant positive effect on the photochemical vapor generation of bismuth were described. Cobalt was found to be the most effective and led to a significant enhancement of the signal. Keywords: photochemical volatile species generation; bismuth; AAS Available at various institutes of the ASCR
Effect of metal sensitizers on photochemical vapor generation of bismuth for analytical atomic spectrometry

Three new sensitizers with a significant positive effect on the photochemical vapor generation of bismuth were described. Cobalt was found to be the most effective and led to a significant enhancement ...

Vyhnanovský, Jaromír; Yildiz, D.; Musil, Stanislav
Ústav analytické chemie, 2019

Metals in atmospheric particulate matter
Barboříková, H.; Mikuška, Pavel; Hegrová, J.; Pokorná, Petra; Krajčovič, J.
2019 - English
Atmospheric pollution is one of the most serious global enviroment problem. Metals constitute important class of pollutants which have received athe attention of researchers all over the world. Metals have strong potential to be adsorbed on particulate matter and than enter the human body through inhalation causing several health issue (asthma, lung cancer). Keywords: aerosol; metals Available at various institutes of the ASCR
Metals in atmospheric particulate matter

Atmospheric pollution is one of the most serious global enviroment problem. Metals constitute important class of pollutants which have received athe attention of researchers all over the world. Metals ...

Barboříková, H.; Mikuška, Pavel; Hegrová, J.; Pokorná, Petra; Krajčovič, J.
Ústav analytické chemie, 2019

LIBS assessment of spatial photon-upconversion nanoparticle distribution in model plants (R. sativus and L. minor)
Modlitbová, P.; Novotný, K.; Hlaváček, Antonín; Pořízka, P.; Kaiser, J.
2019 - English
In the present study, radish (Raphanus sativus L.) and common duckweed (Lemna minor L.) were treated with an aqueous dispersion of carboxylated silica-coated photon-upconversion nanoparticles containing rare-earth elements (Y, Yb, and Er). The total content of rare earths and their bioaccumulation factors were determined in the root, hypocotyl, and leaves of R. sativus after 72 hours, and in L. minor fronds after 168 hours. In R. sativus, translocation factors were determined as the ratio of rare earths content in hypocotyl versus roots and in leaves versus hypocotyl. The lengths of the root and hypocotyl in R. sativus, as well as the frond area in L. minor were monitored as toxicity end points. To distinguish rare-earth bioaccumulation patterns, two-dimensional maps of elemental distribution in the whole R. sativus plant and in L. minor fronds were obtained by using laser-induced breakdown spectroscopy with a lateral resolution of 100 μm. Obtained results revealed that the tested nanoparticles became adsorbed on L. minor fronds and R. sativus roots, and got transferred from roots through the hypocotyl into leaves in R. sativus. Our results show that bioaccumulation patterns and spatial distribution of rare earths in nanoparticle-treated plants differ from those of positive control (the mixture of YCl3, YbCl3, and ErCl3). Keywords: photonupconversion nanoparticles; luminescent nanomaterials; bioaccumulation Available in digital repository of the ASCR
LIBS assessment of spatial photon-upconversion nanoparticle distribution in model plants (R. sativus and L. minor)

In the present study, radish (Raphanus sativus L.) and common duckweed (Lemna minor L.) were treated with an aqueous dispersion of carboxylated silica-coated photon-upconversion nanoparticles ...

Modlitbová, P.; Novotný, K.; Hlaváček, Antonín; Pořízka, P.; Kaiser, J.
Ústav analytické chemie, 2019

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