A5050132533- Atmospheric chemistry and aerosols
- Air Quality Monitoring and Forecasting
- Air Quality and Health Impacts
- Atmospheric Ozone and Climate
- Mass Spectrometry Techniques and Applications
- Advanced Chemical Sensor Technologies
- Water Quality Monitoring and Analysis
- Smart Materials for Construction
- Analytical Chemistry and Chromatography
- Analytical chemistry methods development
- Atmospheric aerosols and clouds
- Catalysis and Oxidation Reactions
- Toxic Organic Pollutants Impact
- Spectroscopy and Chemometric Analyses
- Marine and coastal ecosystems
- Chemistry and Chemical Engineering
- Analytical Chemistry and Sensors
- Indoor Air Quality and Microbial Exposure
University of Basel
2022-2025
University of Vienna
2019-2022
We report on a novel automated oxidation flow reactor to generate wide variety of organic aerosol samples. The instrument is equipped with humidifier, dosing system for volatile precursors and an (OFR) generation secondary matter (SOM). instrument, known as coating unit (OCU), can produce homogeneously nucleated SOM particles or, used in combination standard combustion generator (e.g., diffusion flame soot or any other seed particle), coated controlled amount SOM. physical chemical...
Ozonolysis of alkenes is known to produce reactive intermediates─stabilized Criegee intermediates (SCIs), and their subsequent bimolecular reactions with various carboxylic acids can form α-acyloxyalkyl hydroperoxides (AAHPs), which considered a major class organic peroxides in secondary aerosol (SOA). Despite atmospheric health importance, the molecular-level identification aerosols highly challenging, preventing further assessment environmental fate. Here, we synthesize 20 atmospherically...
Organic peroxides are health-relevant organic components in secondary aerosols (SOA), which is also a major compound class substantially contributing to SOA mass. However, their molecular identification and characterization highly challenging uncertain. Ozonolysis of alkenes known produce reactive intermediates ─ stabilized Criegee intermediates, subsequent bimolecular reactions with various carboxylic acids can form α-acyloxyalkyl hydroperoxides (AAHPs), considered SOA....
Exposure to airborne particulate matter (PM) has been attributed millions of deaths annually. However, the PM components responsible for observed health effects remain unclear. Oxidative potential (OP) gained increasing attention as a key property that may explain toxicity. Using online measurement methods impinge particles OP quantification within seconds, we reveal 60 99% reactive oxygen species (ROS) and in secondary organic aerosol combustion-generated have lifetime minutes hours ROS...
Molecular singly charged clusters generated by electrospray sources are commonly used for calibration measurements of ultrafine Condensation Particle Counters (CPCs) in the sub-2 nm size range. This technique has been limited to smallest clusters. In this study, we a bipolar source combining two electrosprays opposite polarities generate ammonium salts dissolved acetonitrile, i.e., tetra-heptyl bromide (THABr) and tetra-butyl iodide (TBAI) A high-resolution UDMA acts as classifier positively...
Abstract. A significant fraction of atmospheric aerosol particles, which affect both the Earth's climate and human health, can be attributed to organic compounds especially secondary (SOA). To better understand sources processes generating detailed chemical characterization is necessary, particles are often collected onto filters subsequently analyzed by liquid chromatography–mass spectrometry (LC–MS). downside such offline analysis techniques uncertainty regarding artifactual changes in...
Sea spray is a significant global aerosol source with impacts on marine cloud formation and climate. The physical properties atmospheric fate of the sea (SSA) depend its chemical composition, but current understanding sources composition or SSA remains limited particularly for smallest aerosol. ultrafine (<100 nm diameter) particles controls critical diameter activation to droplets. This study presents online measurements salt organic mass fractions in an measured during Spray Chemistry...
Organic peroxides are health-relevant organic components in secondary aerosols (SOA), which is also a major compound class substantially contributing to SOA mass. However, their molecular identification highly challenging and uncertain. Iodide known selectively react with peroxides, kinetics fundamentally determined by the structures of individual peroxides. Here we extrapolate this knowledge develop novel analytical strategy for characterization α-pinene via iodometry kinetic experiments,...
Abstract. A significant fraction of atmospheric aerosol particles, which affect both the Earth’s climate and human health, can be attributed to organic compounds especially secondary (SOA). To better understand sources processes generating detailed chemical characterization is necessary, particles are often collected onto filters subsequently analyzed by liquid chromatography mass spectrometry (LC-MS). downside such offline analysis techniques uncertainty regarding artefactual changes in...
SSample collection and preparationFigure S1: Setup used for the of laboratory-generated secondary organic aerosol samples.5 Table all SOA filters collected displaying time each filter, sum mass per filter quarter average concentration in OCU measured by SMPS.
Collection of secondary organic aerosol (SOA) onto filters is often used in combination with LC-MS for detailed chemical characterization. Studies have shown that a large fraction laboratory-generated SOA can be attributed to high molecular weight oligomeric compounds. Often there significant delay between sample collection and analysis (e.g., during automated filter collection) which may lead changes the profile samples. In this study &#946;-pinene was generated by O3 OH oxidation...
Secondary organic aerosol (SOA) represents a large fraction of atmospheric particles that significantly affect both the Earth's climate and human health. Laboratory-generated SOA or ambient are routinely collected on filters for detailed chemical analysis. Such filter sampling is prone to artifactual changes in composition during collection, storage, sample workup, In this study, we investigate differences generated laboratory, kept at room temperature as aqueous extracts filters, analyzed...
Abstract. We present an electrical mobility classifier for mass-mobility measurements of atmospheric ions. Size segregation coupled with mass spectrometric detection naturally occurring ions in the atmosphere is challenging due to low ion concentration. Conventional classifying devices were not yet spectrometry resolve natural composition. This either insufficient transmission efficiency, or design concepts are incompatible this application e.g., using high electric fields close inlets push...
Abstract. We present an electrical mobility classifier for mass–mobility measurements of atmospheric ions. Size segregation coupled with mass spectrometric detection naturally occurring ions in the atmosphere is challenging due to low ion concentration. Conventional classifying devices were not yet spectrometry resolve natural composition. This either insufficient transmission efficiency or design concepts being incompatible this application, e.g. using high electric fields close inlets push...