Number of found documents: 493
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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 in order to determine trace Cd concentrations by atomic absorption spectrometry (AAS). Several reaction modifiers based on inorganic salts and complexes of CrIII+, CoII+, TiIII+, TiIV+ were tested to improve analytical performance and generation efficiency. Keywords: chemical vapor generation; cadmium; atomic absorption spectrometry Available on request at various institutes of the ASCR
Chemical vapor generation of cadmium for analytical atomic spectrometry

Chemical vapor generation of cadmium volatile compounds was optimized in order to determine trace Cd concentrations by atomic absorption spectrometry (AAS). Several reaction modifiers based on ...

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

Surface modification of nanoparticles for sustaining sensitivity of surface-enhanced raman spectrometric measurements in salinated environment
Týčová, Anna; Přikryl, Jan; Vaňhara, P.; Klepárník, Karel; Foret, František
2020 - English
Surface-enhanced Raman spectrometry (SERS) represents a powerful method for analysis of a broad spectrum of analytes ranging from inorganic ions to biomolecules of high complexity. It combines the potential\nof Raman spectrometry for a definite identification of an analyte with remarkable sensitivity achieved by the surface enhancement effect occurring on metal nanoparticles. While low ionic strength influences positively\nthe sensitivity of the SERS measurement, a higher level of inorganic salts leads to fast ruining of colloidal character, which completely devastates the effect of the surface enhancement. The common stabilization of\nnanoparticles by a layer of polymers has a negative impact on the SERS sensitivity since it shields the nanoparticle surface from the analytes. In this work, we aim at the development of the bi-ligand system of\nnanoparticles surface modification for improved stability of colloid in saline solution at sustaining the potential for sensitive SERS analyses. The proposed system relies on the binding of 3-mercaptopropionic acid and\nthiolated polyethylene glycol in a suitable ratio onto the nanoparticle surfaces. While the short chains of the acid sustain the accessibility of the surface for analytes, the polymeric structures act as a steric barrier\npreventing colloid aggregation. Keywords: bi-ligand; nanoparticle; saline solution; surface-enhanced Raman spectrometry Available at various institutes of the ASCR
Surface modification of nanoparticles for sustaining sensitivity of surface-enhanced raman spectrometric measurements in salinated environment

Surface-enhanced Raman spectrometry (SERS) represents a powerful method for analysis of a broad spectrum of analytes ranging from inorganic ions to biomolecules of high complexity. It combines the ...

Týčová, Anna; Přikryl, Jan; Vaňhara, P.; Klepárník, Karel; Foret, František
Ústav analytické chemie, 2020

Photochemical vapour generation of bismuth 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 of bismuth 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

DNA damage induced by occupational exposure to copper oxide nanoparticles
Rössner st., Pavel; Pelcová, D.; Elzeinová, Fatima; Mikuška, Pavel; Večeřa, Zbyněk; Coufalík, Pavel; Vlčková, Š.; Fenclová, Z.; Rössnerová, Andrea
2020 - English
Copper oxide nanoparticles (CuO NPs) have a widespread use in industry, chemistry, in production of electronic devices and as an antimicrobial agent. Although copper is an important biogenic element, CuO NPs are toxic with the ability to induce oxidative stress, apoptosis, cell cycle arrest or DNA damage. For humans, the inhalation route is the most common way of exposure to CuO NPs. In the body, CuO NPs may be either deposited in the lungs, or transported to other organs. Their presence usually causes oxidative stress or inflammatory responses, consequently leading to DNA damage. In this study, we investigated the effect of CuO NPs inhalation on DNA damage in a group of researches conducting animal exposure experiments. The subjects were exposed to various metal oxide nanoparticles, including CuO NPs, by inhalation for an average of 4.9 ± 0.4 years. The average mass concentration of Cu in the air during the experiment was 7.3 ± 3.2 ng/m3. Subjects not exposed to nanoparticles served as a control group. We applied micronucleus assay using Human Pan Centromeric probes to detect DNA damage and to distinguish between the frequency of centromere positive (CEN+) and centromere negative (CEN−) micronuclei (MN) in the binucleated cells. We\ndid not find differences between both groups for either mean MN frequency (10.38 ± 2.50 vs. 11.88 ± 3.01 MN/1000 binucleated cells), or CEN+/CEN- ratio (58%/42% vs. 55%/45%), for the exposed and controls, respectively. In conclusion, inhalation of CuO NPs at this low-level exposure had no effect on chromosomal losses and/or breaks. Keywords: copper oxide nanoparticles; inhalation; DNA damage Available in digital repository of the ASCR
DNA damage induced by occupational exposure to copper oxide nanoparticles

Copper oxide nanoparticles (CuO NPs) have a widespread use in industry, chemistry, in production of electronic devices and as an antimicrobial agent. Although copper is an important biogenic element, ...

Rössner st., Pavel; Pelcová, D.; Elzeinová, Fatima; Mikuška, Pavel; Večeřa, Zbyněk; Coufalík, Pavel; Vlčková, Š.; Fenclová, Z.; Rössnerová, Andrea
Ústav analytické chemie, 2020

Deposition of dried colloidal suspension via nanoelectrospray
Jonas, Vladimír; Týčová, Anna; Přikryl, Jan; Kotzianová, A.; Velebný, V.; Foret, František
2020 - English
Electrospray is a relatively well-established tool for the deposition of nanoparticles. In this work, we use nanoelectrospray (nES) operating at flow rates down to tens of nanoliters per minute. As a result, the formed aerosol consists of very small droplets quickly drying during the flight towards a counter-electrode. Therefore, we obtained deposits of increased homogeneous distribution without an undesirable coffee-ring effect. Moreover, the character of the aerosol plume is only a few millimeters wide, so it allows good control over the deposit localization. Keywords: nanoparticles; nanoelectrospray; silver Fulltext is available at external website.
Deposition of dried colloidal suspension via nanoelectrospray

Electrospray is a relatively well-established tool for the deposition of nanoparticles. In this work, we use nanoelectrospray (nES) operating at flow rates down to tens of nanoliters per minute. As a ...

Jonas, Vladimír; Týčová, Anna; Přikryl, Jan; Kotzianová, A.; Velebný, V.; Foret, František
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

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

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

Přehledný text popisující využití techniky generování těkavých hydridů v hmotnostní spektrometrií s indukčně vázaným plazmatem včetně speciačních analýz....

Matoušek, Tomáš
Ústav analytické chemie, 2019

Stanovení rychlých změn koncentrací těkavých organických sloučenin pomocí difúzního denuderu
Křůmal, Kamil; Mikuška, Pavel
2019 - Czech
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. 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. Keywords: monoterpenes; BTEX; denuder Available in digital repository of the ASCR
Stanovení rychlých změn koncentrací těkavých organických sloučenin pomocí difúzního denuderu

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 ...

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

Organické sloučeniny a markery ze spalování uhlí v různých typech kotlů používaných pro vytápění domácností
Křůmal, Kamil; Mikuška, Pavel; Horák, J.; Hopan, F.
2019 - Czech
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. 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. Keywords: household heating; coal combustion; hopanes Available in digital repository of the ASCR
Organické sloučeniny a markery ze spalování uhlí v různých typech kotlů používaných pro vytápění domácností

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 ...

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

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