Veronika Pospíšilová
A5081146288- Atmospheric chemistry and aerosols
- Air Quality and Health Impacts
- Atmospheric Ozone and Climate
- Air Quality Monitoring and Forecasting
- Advanced Chemical Sensor Technologies
- Atmospheric and Environmental Gas Dynamics
- Atmospheric aerosols and clouds
- Mass Spectrometry Techniques and Applications
- Geophysics and Gravity Measurements
- Vehicle emissions and performance
- Analytical chemistry methods development
- Glioma Diagnosis and Treatment
- Indoor Air Quality and Microbial Exposure
- 3D Printing in Biomedical Research
- Analytical Chemistry and Chromatography
- Toxic Organic Pollutants Impact
- Odor and Emission Control Technologies
- Spectroscopy and Laser Applications
- Children's Physical and Motor Development
- Respiratory and Cough-Related Research
- Bluetooth and Wireless Communication Technologies
- Wind and Air Flow Studies
- Russia and Soviet political economy
- Economic Analysis and Policy
- Safety and Risk Management
Tofwerk (Switzerland)
2020-2024
Institut de Recherches sur la Catalyse et l'Environnement de Lyon
2024
Centre National de la Recherche Scientifique
2024
Masaryk University
2023
Paul Scherrer Institute
2018-2022
PrimeCell Therapeutics (Czechia)
2021
Ionicon Analytik (Austria)
2018
Czech Academy of Sciences, J. Heyrovský Institute of Physical Chemistry
2013-2014
Charles University
2013-2014
Atmospheric aerosol formation from biogenic vapors is strongly affected by air pollutants, like NO x , SO 2 and NH 3 .
A list of authors and their affiliations appears at the end paper New-particle formation is a major contributor to urban smog1,2, but how it occurs in cities often puzzling3. If growth rates particles are similar those found cleaner environments (1-10 nanometres per hour), then existing understanding suggests that new should be rapidly scavenged by high concentration pre-existing particles. Here we show, through experiments performed under atmospheric conditions CLOUD chamber CERN, below...
Significance Recent work in Los Angeles has shown that urban volatile organic compound (VOC) emissions from consumer and industrial products—termed chemical products (VCPs)—are now an important source of ozone precursors. Using advancements VOC instrumentation, we show VCP are ubiquitous regions can be identified via unique fingerprints. Through detailed modeling, VCPs as to production fossil fuel VOCs the chemistry have significant impacts on model simulations key atmospheric processes....
Abstract. Real-time, online measurements of atmospheric organic aerosol (OA) composition are an essential tool for determining the emissions sources and physicochemical processes governing effects on climate health. However, reliance current techniques thermal desorption, hard ionization, and/or separated collection/analysis stages introduces significant uncertainties into OA measurements, hindering progress towards these goals. To address this gap, we present a novel, field-deployable...
Highly oxygenated organic molecules (HOMs) are formed from the oxidation of biogenic and anthropogenic gases affect Earth's climate air quality by their key role in particle formation growth. While these gas phase has been extensively studied, complexity aerosol (OA) lack suitable measurement techniques have hindered investigation fate post-condensation, although further reactions proposed. We report here novel real-time measurements species phase, achieved using our recently developed...
To better understand the role of aromatic hydrocarbons in new-particle formation, we measured particle-phase abundance and volatility oxidation products following reaction with OH radicals. For this used thermal desorption an iodide-adduct Time-of-Flight Chemical-Ionization Mass Spectrometer equipped a Filter Inlet for Gases AEROsols (FIGAERO-ToF-CIMS). The measurements confirm that toluene naphthalene can contribute to initial growth newly formed particles. Toluene-derived (C7) have similar...
Abstract. Nucleation of atmospheric vapours produces more than half global cloud condensation nuclei and so has an important influence on climate. Recent studies show that monoterpene (C10H16) oxidation yields highly oxygenated products can nucleate with or without sulfuric acid. Monoterpenes are emitted mainly by trees, frequently together isoprene (C5H8), which the highest emission all organic vapours. Previous have shown suppresses new-particle formation from monoterpenes, but cause this...
Abstract. Real-time, in situ molecular composition measurements of the organic fraction fine particulate matter (PM2.5) remain challenging, hindering a full understanding climate impacts and health effects PM2.5. In particular, thermal decomposition ionization-induced fragmentation affecting current techniques has limited detailed investigation secondary aerosol (SOA), which typically dominates OA. Here we deploy novel extractive electrospray ionization time-of-flight mass spectrometer...
Smog chamber experiments were conducted to characterize the light absorption of brown carbon (BrC) from primary and photochemically aged coal combustion emissions. Light was measured by UV–visible spectrophotometric analysis water methanol extracts filter samples. The single-scattering albedo at 450 nm 0.73 ± 0.10 for emissions 0.75 0.13 coefficient 365 higher than that a factor 10 7 This suggests majority BrC is water-insoluble even after aging. mass efficiency this (MAE365) OA (POA)...
Abstract. New particle formation (NPF) is a significant source of atmospheric particles, affecting climate and air quality. Understanding the mechanisms involved in urban aerosols important to develop effective mitigation strategies. However, NPF rates reported polluted boundary layer span more than 4 orders magnitude, reasons behind this variability are subject intense scientific debate. Multiple vapours have been postulated participate NPF, including sulfuric acid, ammonia, amines...
Abstract. Improving the understanding of health and climate impacts aerosols remains challenging is restricted by limitations current measurement techniques. Detailed investigation secondary organic aerosol (SOA), which typically dominating fraction (OA), requires instrumentation capable real-time, in situ measurements molecular composition. In this study, we present first ambient a novel extractive electrospray ionization time-of-flight mass spectrometer (EESI-TOF-MS). The EESI-TOF-MS was...
Abstract. In recent years, the Indian capital city of Delhi has been impacted by very high levels air pollution, especially during winter. Comprehensive knowledge composition and sources organic aerosol (OA), which constitutes a substantial fraction total particulate mass (PM) in Delhi, is central to formulating effective public health policies. Previous source apportionment studies identified key primary OA (POA) showed that secondary (SOA) played major role but were unable resolve specific...
Abstract. In recent years, intense haze events in megacities such as Beijing have received significant attention. Although secondary organic aerosol (SOA) has been identified a major contributor to events, knowledge of its sources and formation mechanisms remains uncertain. We investigate this question through the first field deployment extractive electrospray ionisation time-of-flight mass spectrometer (EESI-TOF) Beijing, together with an Aerodyne long-time-of-flight (L-TOF AMS)....
RATIONALE Inflammatory bowel disease has a relatively large incidence in modern populations and the current diagnostic methods are either invasive or have limited sensitivity specificity. Thus, there is need for new non‐invasive its diagnosis therapeutic monitoring, breath analysis represents promising direction this area of research. Specifically, method needed absolute quantification pentane human breath. METHODS Selected ion flow tube mass spectrometry (SIFT‐MS) been used to study...
During the past two decades, induced pluripotent stem cells (iPSCs) have been widely used to study human neural development and disease. Especially in field of Alzheimer's disease (AD), remarkable effort has put into investigating molecular mechanisms behind this Then, with advent 3D neuronal cultures cerebral organoids (COs), several studies demonstrated that model can adequately mimic familial sporadic AD. Therefore, we created an AD-CO using iPSCs derived from patients AD forms explored...
The objective of this experimental study was to discover volatile metabolites present in exhaled breath that could be used as biomarkers gastro-esophageal reflux disease, GERD, one the most common causes chronic cough. An vitro model based on pork tissue samples exposed a challenge by artificial gastric fluid identify specific compounds chosen for quantification directly GERD patients and controls using selected ion flow tube mass spectrometry, SIFT-MS. GC/MS analyses headspace indicated...
Truncating genetic variants of SORL1 , encoding the endosome recycling receptor SORLA, have been accepted as causal Alzheimer’s disease (AD). However, most observed in are missense variants, for which it is complicated to determine pathogenicity level because carriers come from pedigrees too small be informative penetrance estimations. Here, we describe three unrelated families coding variant rs772677709, that leads a p.Y1816C substitution, segregates with disease. Further, investigate...
Abstract. Volatile organic compounds (VOCs) and volatile inorganic (VICs) provide critical information across many scientific fields including atmospheric chemistry soil biological processes. Chemical ionization (CI) mass spectrometry has become a powerful tool for tracking these chemically complex temporally variable in variety of laboratory field environments. It is particularly with time-of-flight spectrometers, which can measure hundreds fraction second have enabled entirely new branches...
Residential coal combustion is a significant contributor to particulate urban air pollution in Chinese mega cities and some regions Europe. While the emission factors chemical characteristics of organic inorganic aerosol from have been extensively studied, composition nonmethane gas (NMOG) residential are mostly unknown. We conducted 23 individual burns traditional stove used for heating cooking using five different coals with origins, characterizing NMOG emissions proton transfer reaction...
Using real-time simultaneous gas- and particle-phase data, the condensation of naphthalene β-caryophyllene oxidation products on a molecular level is discussed.
Atmospheric secondary organic aerosol (SOA) undergoes chemical and physical changes when exposed to UV radiation, affecting the atmospheric lifetime of involved molecules. However, these photolytic processes remain poorly constrained. Here, we present a study aimed at characterizing, molecular level in real time, composition α-pinene SOA UV-A light 50% relative humidity an simulation chamber. Significant mass loss is observed high loadings (∼100 μg m–3), whereas effect less prevalent lower...
Ice cores are climate archives suitable for the reconstruction of past atmospheric composition changes. core analysis provides valuable insight into chemical nature aerosols and enables constraining emission inventories primary emissions gas-phase precursors. Changes in volatile organic compounds (VOCs) can affect formation rates mechanisms as well during preindustrial era, key information understanding aerosol effects. Here, we present an analytical method preserved glacier ice cores. A...
Abstract. In recent years, intense haze events in megacities such as Beijing have received significant study. Although secondary organic aerosol (SOA) has been identified a major contributor to events, knowledge of its sources and formation mechanisms remains uncertain. We investigate this question through the first field deployment extractive electrospray ionisation time-of-flight mass spectrometer (EESI-TOF-MS) Beijing, together with an Aerodyne long (L-TOF AMS). Measurements were...
2,4,6-Trichloroanisole (TCA) contamination of wine determines huge economic losses for the industry estimated to amount several billion dollars yearly. Over 50 years studies have determined that this problem is often caused by TCA cork stopper, which releases into wine. The human threshold extremely low. A contaminated 1–2 ng/L can be perceived as tainted. Contaminations with <0.5 are commonly considered negligible and not perceivable. possibility prescreening stoppers would an enormous...