Analysis of textile waste streams in the Czech Republic
Shtukaturova, Anastasia
2022 - English
Our results confirm that the Czech Republic is not well prepared to fulfill the ambitious goals of the CEAP in respect to textile waste because of continually growing volumes of this type of the waste and hardly available official data about its production, lack of recycling technologies and obsolete waste collection system.\n
Keywords:
textile waste streams; analysis; new waste treatment law
Available in a digital repository NRGL
Analysis of textile waste streams in the Czech Republic
Our results confirm that the Czech Republic is not well prepared to fulfill the ambitious goals of the CEAP in respect to textile waste because of continually growing volumes of this type of the waste ...
What happens to microplastics in nature
Spáčilová, Markéta
2022 - English
This work was focused on preparation of microplastic particles which correspond to microplastics in the environment. The five most used plastics (polyethylene, polyamide, polytetrafluoroethylene, polyethylene glycol terephthalate, and polystyrene) were used for preparation. Microplastics were prepared by grinding common used plastics to match the actual microplastics present in the environment as closely as possible. The shape and size of the prepared particles\nwere obtained by scanning electron microscopy. Raman and infrared spectroscopy were used to characterize the microplastic structures. Simultaneously, methodology to determine the amount of microplastic particles in simulated water samples was developed.
Keywords:
microplastic particles; raman spectroscopy; uv degradation
Available in a digital repository NRGL
What happens to microplastics in nature
This work was focused on preparation of microplastic particles which correspond to microplastics in the environment. The five most used plastics (polyethylene, polyamide, polytetrafluoroethylene, ...
Adaptive synthesis of functional amphiphilic dendrons for drug nanocarrier assembly
Edr, Antonín
2022 - English
In this work, an adaptive synthesis of new type of amphiphilic dendrons for nanocarrier purposes will be presented. This methodology was applied in preparation of vast library of substrates.
Keywords:
symmetrical dendrons; drug nanocarrier assembly; drug delivery
Available in a digital repository NRGL
Adaptive synthesis of functional amphiphilic dendrons for drug nanocarrier assembly
In this work, an adaptive synthesis of new type of amphiphilic dendrons for nanocarrier purposes will be presented. This methodology was applied in preparation of vast library of substrates.
The Impact of the IMO-2020 Shipping Regulation on the Atmospheric Deposition of Sulfur around the Western English Channel and the Use of the V/Ni ratio as a Shipping Marker.
Windell, L.; Bell, T.; White, C.; Schwarz, Jaroslav; Ussher, S.
2022 - English
Anthropogenic aerosols are shown to have a great impact on marine ecosystems and human health, with the shipping industry contributing as a significant source of these\nemissions, and annual growth on the rise. In the marine environment, shipping emissions often dominate atmospheric deposition of sulfur. With around 70% of shipping activity\nbeing carried out within 400 km of the coast, its contribution to atmospheric sulfur is of great interest. The International Maritime Organisation (IMO) introduced a regulation on\n01/01/2020 restricting global marine fuel sulfur content from 3.5% to 0.5% w/w. The vanadium/nickel (V/Ni) ratio has been widely used as a marker of shipping emissions, with the range of 2.5 to 4 indicating shipping activity. The regulation has called into question the viability of the earlier use of the V/Ni ratio.
Keywords:
IMO-2020 Global sulfur cap; shipping emissions; sulfur
Available in a digital repository NRGL
The Impact of the IMO-2020 Shipping Regulation on the Atmospheric Deposition of Sulfur around the Western English Channel and the Use of the V/Ni ratio as a Shipping Marker.
Anthropogenic aerosols are shown to have a great impact on marine ecosystems and human health, with the shipping industry contributing as a significant source of these\nemissions, and annual growth on ...
NMR Aerosolomics Study of Water-Soluble Organic Compounds in Size-Resolved Particulate Matter
Horník, Štěpán; Vodička, Petr; Pokorná, Petra; Schwarz, Jaroslav; Ždímal, Vladimír; Sýkora, Jan
2022 - English
Organic aerosols (OA) account for a significant fraction (10 – 90%) of atmospheric particulate matter (Hallquist et al., 2009). The composition of organic aerosols is very complex and is usually characterized by their water solubility. Water-soluble organic compounds (WSOC) constitute a large fraction of OA (10 – 80%) and consist of chemical species containing oxygenated functional groups such as hydroxyl, carboxyl, or carbonyl groups. NMR spectroscopy represents an alternative to commonly used techniques (gas chromatography-mass spectrometry, liquid chromatography-based techniques) for WSOC analysis. Our recently introduced method, called NMR aerosolomics, allows quantitative analysis of dozens of individual compounds from different aerosol samples. An important part of the characterization of aerosols is their classification by particle size. The analysis of individual compounds in the size-resolved fractions of the WSOC class has been performed only in a few studies that focus mainly on a particular subclass of compounds or use multiple analytical techniques.
Keywords:
NMR; aerosolomics; organic composition
Available in a digital repository NRGL
NMR Aerosolomics Study of Water-Soluble Organic Compounds in Size-Resolved Particulate Matter
Organic aerosols (OA) account for a significant fraction (10 – 90%) of atmospheric particulate matter (Hallquist et al., 2009). The composition of organic aerosols is very complex and is usually ...
Three Years of Experience with Measurement of Cloud Condensation Nuclei Concentrations Using Cloud Condensation Nuclei Counter CCN-200
Moravec, Pavel; Lhotka, Radek; Ždímal, Vladimír
2022 - English
Aerosol particles in the atmosphere that allow water vapor to condense and form cloud droplets are called Cloud Condensation Nuclei (CCN). Elevated concentrations of \nCCN tend to increase the concentration and decrease the size of droplets. This can lead to suppression of precipitation in shallow and short-lived clouds and to greater convective \noverturning and more precipitation in deep convective clouds. The response of cloud properties and precipitation processes to increasing anthropogenic aerosol concentrations represents one of the largest uncertainties in the current understanding of climate change. One of the fundamental challenges is to determine the ability of aerosol particles to act as CCN under relevant atmospheric conditions. Knowledge of the spatial and temporal distribution in the atmosphere is essential to incorporate the effects of CCN into meteorological models of all scales, Huang et al. (2007). Long-term CCN measurements are performed at aerosol monitoring sites such as those forming ACTRIS (Aerosols, Clouds and Trace Gases Research Infrastructure) network. In this paper, we present the three-year experience of measuring CCN concentrations over the National Atmospheric Observatory Košetice (NAOK), a rural background site in the Czech Republic. The first results of these measurements were presented by Mishra et al. (2022)
Keywords:
atmospheric aerosols; CCN; CCN concentration measurement
Available in a digital repository NRGL
Three Years of Experience with Measurement of Cloud Condensation Nuclei Concentrations Using Cloud Condensation Nuclei Counter CCN-200
Aerosol particles in the atmosphere that allow water vapor to condense and form cloud droplets are called Cloud Condensation Nuclei (CCN). Elevated concentrations of \nCCN tend to increase the ...
Personal exposure measurement during dental nanocomposite grinding
Ždímal, Vladimír; Ondráčková, Lucie; Ondráček, Jakub; Schwarz, Jaroslav; Bradna, P.; Roubíčková, A.; Pelclová, D.; Rössnerová, Andrea
2022 - English
The purpose of this study was to measure the personal exposure of each participant of the study and to compare the results with those of static monitoring. Personal nanoparticle sam-plers (PENS), which can simultaneously detect both nanoparticles (PM0.1) and respirable parti-cles (PMA), were used to determine personal exposure (Tsai et al., 2012). Area monitoring in-cluded measurement of mass concentrations using the Berner Low Pressure Impactor (BLPI 25/0.018 /2, Hauke GmbH, Gmunden, Austria) and the Low Volume Sampler (LV5, Sven Leckel Ingenieurbüro GmbH, Germany). The number concentrations and their size distributions were measured with the Scanning Mobility Particle Sizer (5MP5 3936, T5I Inc., USA) and the Aerody-namic Particle Sizer (APS 3321, TSI Inc., USA). Measurements with all of the above- mentioned instruments were performed in four shifts with six participants per shift. Each participant milled for 10 minutes and then remained in the room until the group finished the session, so the total exposure lasted about 70 minutes. Due to the high content of filler nanoparticles, the nanocom-posite Filtek Ultimate (body A2, 3M ESPE, USA) was selected for these measurements.
Keywords:
dental treatment; personal exposure; nanocomposites
Available in a digital repository NRGL
Personal exposure measurement during dental nanocomposite grinding
The purpose of this study was to measure the personal exposure of each participant of the study and to compare the results with those of static monitoring. Personal nanoparticle sam-plers (PENS), ...
Multiplication of urea sites—impact on binding phosphates
Salvadori, Karolína
2022 - English
In our work, we focused on the synthesis of sensory groups based on urea structural motifs, suitable for binding phosphates. These units were tested for their selectivity and binding efficiency in HB competitive solvent (DMSO).\n
Keywords:
urea; phosphates; concentrations
Available in a digital repository NRGL
Multiplication of urea sites—impact on binding phosphates
In our work, we focused on the synthesis of sensory groups based on urea structural motifs, suitable for binding phosphates. These units were tested for their selectivity and binding efficiency in HB ...
A seven-years based characterization of aerosol light scattering properties at Central European rural site: Variability and source apportionment
Suchánková, Lenka
2022 - English
In addition, the sources of scattering aerosols, chemical composition, meteorological conditions, particle size distribution, and radiative forcing will be further investigated at NAOK to better understand the direct effects of aerosols on local climate.
Keywords:
organic aerosol; measurements; aerosol light scattering properties
Available in a digital repository NRGL
A seven-years based characterization of aerosol light scattering properties at Central European rural site: Variability and source apportionment
In addition, the sources of scattering aerosols, chemical composition, meteorological conditions, particle size distribution, and radiative forcing will be further investigated at NAOK to better ...
Use of photoautotrophic microorganisms in bioremediation of surface waters
Mušálková, Petra
2022 - English
The aim of my thesis is to develop an alternative method of removing this overplus of nutrients from surface waterbodies in a biological way, withthe use of microalgae and cyanobacteria. \n
Keywords:
microalgae; cyanobacteria; water eutrophication
Available in a digital repository NRGL
Use of photoautotrophic microorganisms in bioremediation of surface waters
The aim of my thesis is to develop an alternative method of removing this overplus of nutrients from surface waterbodies in a biological way, withthe use of microalgae and cyanobacteria. \n
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