A5101469004- Atmospheric chemistry and aerosols
- Air Quality and Health Impacts
- Atmospheric Ozone and Climate
- Air Quality Monitoring and Forecasting
- Atmospheric and Environmental Gas Dynamics
- Advanced Chemical Sensor Technologies
- Plant responses to elevated CO2
- Mass Spectrometry Techniques and Applications
- Atmospheric aerosols and clouds
- Microbial bioremediation and biosurfactants
- Vehicle emissions and performance
- Spectroscopy and Laser Applications
- Microbial Metabolic Engineering and Bioproduction
- Catalytic Processes in Materials Science
- Indoor Air Quality and Microbial Exposure
- Analytical Chemistry and Chromatography
- Arctic and Antarctic ice dynamics
- Toxic Organic Pollutants Impact
- Biofuel production and bioconversion
- Glycosylation and Glycoproteins Research
- Enzyme Production and Characterization
- Viral Infectious Diseases and Gene Expression in Insects
- Enzyme Catalysis and Immobilization
- Insect Pheromone Research and Control
- Microbial Community Ecology and Physiology
Ionicon Analytik (Austria)
2010-2024
Fraunhofer Institute for Cell Therapy and Immunology
2024
Universität Innsbruck
2014-2023
Utrecht University
2018
Université Claude Bernard Lyon 1
2011-2017
Institut de Recherches sur la Catalyse et l'Environnement de Lyon
2011-2017
University of Montana
2016-2017
Centre National de la Recherche Scientifique
2011-2017
Boehringer Ingelheim (Germany)
2015-2016
Oak Ridge Associated Universities
2015
We present the unprecedented capability to identify and quantify volatile organic compounds (VOCs) by means of proton transfer reaction time-of-flight (PTR-TOF) mass spectrometry on-line with high time resolution. A resolving power 4000-5000 a accuracy 2.5 ppm allow for unambiguous sum-formula identification hydrocarbons (HCs) oxygenated VOCs (OVOCs). Test masses measured over an 11-wk period are very precise (SD < 3.4 ppm) shows good stability 5%). Based on 1 min resolution, we demonstrate...
Abstract Wildfires emit significant amounts of pollutants that degrade air quality. Plumes from three wildfires in the western U.S. were measured aircraft during Studies Emissions and Atmospheric Composition, Clouds Climate Coupling by Regional Surveys (SEAC 4 RS) Biomass Burning Observation Project (BBOP), both summer 2013. This study reports an extensive set emission factors (EFs) for over 80 gases 5 components submicron particulate matter (PM 1 ) these temperate wildfires. These include...
Biogenic sources contribute to cloud condensation nuclei (CCN) in the clean marine atmosphere, but few measurements exist constrain climate model simulations of their importance. The chemical composition individual atmospheric aerosol particles showed two types sulfate-containing air masses addition mass-based Estimated Salt particles. Both sulfate lack combustion tracers and correlate, for some conditions, or seawater dimethyl sulfide (DMS) concentrations, which means source was largely...
Abstract. Chamber oxidation experiments conducted at the Fire Sciences Laboratory in 2016 are evaluated to identify important chemical processes contributing hydroxy radical (OH) chemistry of biomass burning non-methane organic gases (NMOGs). Based on decay primary carbon measured by proton transfer reaction time-of-flight mass spectrometry (PTR-ToF-MS), it is confirmed that furans and oxygenated aromatics among NMOGs emitted from western United States fuel types with highest reactivities...
We report on on-line breath gas analysis with a new type of analytical instrument, which represents the next generation proton-transfer-reaction mass spectrometers. This time-of-flight spectrometer in combination soft ionization (PTR-TOF) offers numerous advantages for sensitive detection volatile organic compounds and overcomes several limitations. First, instrument allows measurement complete spectrum within fraction second. Second, high resolving power enables separation isobaric...
Abstract. The climate in the Arctic is changing faster than anywhere else on earth. Poorly understood feedback processes relating to clouds and aerosol–cloud interactions contribute a poor understanding of present changes system, also large spread projections future Arctic. problem exacerbated by paucity research-quality observations central Improved formulations models require such observations, which can only come from measurements situ this difficult-to-reach region with logistically...
Abstract. We present results from the international field campaign DAURE (Determination of sources atmospheric Aerosols in Urban and Rural Environments Western Mediterranean), with objective apportioning fine carbonaceous aerosols. Submicron particulate matter (PM1) samples were collected during February–March 2009 July at an urban background site Barcelona (BCN) a forested regional Montseny (MSY). radiocarbon (14C) analysis for elemental organic carbon (EC OC) source apportionment these...
Proton transfer reaction-time of flight (PTR-TOF) mass spectrometry was used to improve detection biogenic volatiles organic compounds (BVOCs) induced by leaf wounding and darkening. PTR-TOF measurements unambiguously captured the kinetic large emissions green (GLVs) acetaldehyde after GLVs emission correlated with extent wounding, thus confirming be an excellent indicator mechanical damage. Transient methanol, C5 isoprene from plant species that do not emit constitutively were also detected...
Abstract Satellite‐based measurements of the column CH 2 O/NO ratio have previously been used to estimate near‐surface ozone (O 3 ) sensitivity (i.e., NO x or VOC limited), and forthcoming launch air quality‐focused geostationary satellites provides a catalyst for reevaluating ability satellite‐measured be in this manner. In study, we use 0‐D photochemical box model evaluate O find that relative rate radical termination from radical‐radical interactions radical‐NO (referred as LRO /LNO good...
The recently developed PTR-TOF instrument was evaluated to measure methanol fluxes emitted from grass land using the eddy covariance method. high time resolution of allowed storing full mass spectra up m/z 315 with a frequency 10 Hz. Three isobaric ions were found at nominal 33 due resolving power PTR-TOF. Only one three peaks contributed fluxes. exact this peak agrees well protonated (m/z 33.0335). measured compared virtual disjunct simultaneously conventional PTR-MS. both instruments show...
Abstract. Measurements of submicron aerosol chemical composition were made over the central Arctic Ocean from 5 August to 8 September 2008 as a part Summer Cloud Study (ASCOS) using an mass spectrometer (AMS). The median levels sulphate and organics for entire study 0.051 0.055 μ g m−3, respectively. Positive matrix factorisation was performed on spectral time series this enabled marine biogenic continental sources particles be separated. These factors accounted 33% 36% sampled ambient mass,...
Abstract. We herein present a novel modular inlet system designed to be coupled low-pressure gas analyzers for online chemical characterization of semi-volatile submicron particles. The "chemical analysis aerosol online" (CHARON) consists gas-phase denuder stripping off analytes, an aerodynamic lens particle collimation combined with inertial sampler the particle-enriched flow and thermodesorption unit volatilization prior analysis. was measured remove organics efficiency > 99.999%...
Abstract. Herein, we report on the development of a compact proton-transfer-reaction time-of-flight mass spectrometer (PTR-ToF-MS) for airborne measurements volatile organic compounds (VOCs). The new instrument resolves isobaric ions with resolving power (m/Δm) ~1000, provides accurate m/z (Δm < 3 mDa), records full spectra at 1 Hz and thus overcomes some major analytical deficiencies quadrupole-MS-based instruments. detection limits biogenic VOCs (isoprene, α total monoterpenes),...
Abstract High time resolution measurements of volatile organic compounds (VOCs) were collected using a proton‐transfer‐reaction quadrupole mass spectrometry (PTR‐QMS) instrument at the Platteville Atmospheric Observatory (PAO) in Colorado to investigate how oil and natural gas (O&NG) development impacts air quality within Wattenburg Gas Field (WGF) Denver‐Julesburg Basin. The carried out July August 2014 as part NASA's “Deriving Information on Surface Conditions from Column Vertically...
We report on a new method for analyzing atmospheric submicrometer particulate organic matter which combines direct particle sampling and volatilization with online chemical ionization mass spectrometric analysis. Technically, the relies combined use of CHARON ("Chemical Analysis Aerosol Online") inlet proton-transfer-reaction time-of-flight spectrometer (PTR-ToF-MS). Laboratory studies target analytes showed that conditions in PTR-ToF-MS lead to extensive fragmentation levoglucosan...
Credible climate change predictions require reliable fundamental scientific knowledge of the underlying processes. Despite extensive observational data accumulated to date, atmospheric aerosols still pose key uncertainties in understanding Earth's radiative balance due direct interaction with radiation and because they modify clouds' properties. Specifically, major gaps exist physicochemical pathways that lead aerosol growth atmosphere changes their properties while atmosphere....
Eddy covariance (EC) is the preferable technique for flux measurements since it only direct determination method. It requires a continuum of high time resolution (e.g. 5-20 Hz). For volatile organic compounds (VOC) soft ionization via proton transfer reaction has proven to be quantitative method real mass spectrometry; here we use flight spectrometer (PTR-TOF) 10 Hz EC full spectra up m/z 315. The PTR-TOF enabled identification chemical formulas and separation oxygenated hydrocarbon species...
Abstract. An instrumented NASA P-3B aircraft was used for airborne sampling of trace gases in a plume that had emanated from small forest understory fire Georgia, USA. The sampled at its origin to derive emission factors and followed ∼ 13.6 km downwind observe chemical changes during the first hour atmospheric aging. payload included proton-transfer-reaction time-of-flight mass spectrometer (PTR-ToF-MS), which measured non-methane organic (NMOGs) unprecedented spatiotemporal resolution (10 m...
The human pathogenic bacterium Pseudomonas aeruginosa produces rhamnolipids, glycolipids with functions for bacterial motility, biofilm formation, and uptake of hydrophobic substrates. Rhamnolipids represent a chemically heterogeneous group secondary metabolites composed one or two rhamnose molecules linked to mostly 3-hydroxyfatty acids various chain lengths. biosynthetic pathway involves rhamnosyltransferase I encoded by the rhlAB operon, which synthesizes 3-(3-hydroxyalkanoyloxy)alkanoic...