11:30am - 11:45amTU2-2: 1
Continuous chemical characterization and source apportionment of ultrafine particulate matter (PM0.1) in an urban and a background site
Georgia A. Argyropoulou1,2, Christina N. Vasilakopoulou1, Kalliopi Florou1, Christos Kaltsonoudis1, Angeliki Matrali1,2, Andreas Aktypis1, Maria Georgopoulou1,2, Katerina Seitanidi1, Christina Christopoulou1,2, Panayiotis Kalkavouras3, Nikos Mihalopoulos3, Spyros N. Pandis1,2
1Institute of Chemical Engineering Sciences, ICE-HT/FORTH, Patras, 265 04, Greece; 2Department of Chemical Engineering, University of Patras, Patras, 265 04, Greece; 3Institute for Environmental Research and Sustainable Development, National Observatory of Athens, Athens, 118 10, Greece
Ultrafine particles (PM0.1) can penetrate sensitive organs and pose health risks, but measuring their chemical composition is challenging due to low mass concentration and interference from larger particles. Traditional methods using cascade impactors have limitations in temporal resolution and labor demands. This study used an Aerodynamic Aerosol Classifier (AAC) to isolate PM0.1, followed by instruments for continuous composition measurements. Field campaigns in Greece revealed different PM0.1 chemical composition profiles: Poros (background site; secondary formation, sulfate-dominated) and Athens (urban site; traffic, biomass burning, and cooking sources). The temporal variations in concentration, composition, and sources at both locations have been analyzed.
11:45am - 12:00pmTU2-2: 2
Assessing the chemical composition of 10-50 nm particles with an online DMA-VIA-MION-Orbitrap setup
Henning Finkenzeller1,2, Arttu Yli-Kujala1, Ella Häkkinen1, Jian Zhao1, Runlong Cai3, Mrisha Koirala1, Anna Bengs1, Paxton Juuti2, Aleksei Shcherbinin2, Mikael Ehn1, Juha Kangasluoma1
1University of Helsinki, Finland; 2Karsa Ltd, Helsinki, Finland; 33Shanghai Key Laboratory of Atmospheric Particle Pollution and Prevention (LAP3), Department of Environmental Science & Engineering, Fudan University, 200438 Shanghai, China
Measuring the compositon of aerosol particles at the start of their formation, when they are only several nanometers large, is interesting as it reveals what vapours specifically contribute to nucleation. However, attaining molecular information is difficult due to low masses and the requirement of soft ionization. In this study, we employ a novel DMA-VIA-MION-Orbitrap setup to characterize the composition of size-selected aerosol particles in the laboratory and ambient measurements. We present first results from a deployment of the novel approach to Mace Head, Ireland, where marine VOC emissions and the composition of 10-20 nm particles were targeted.
12:00pm - 12:15pmTU2-2: 3
A new method to characterize aerosol chemical composition using Nanoelectromechanical Systems Fourier Transform Infrared Spectroscopy: NEMS-FTIR
Mihnea Surdu1, Jelena Timarac-Popović2,3, Tatjana Penn2, Niklas Luhmann2, Johannes Hiesberger2, Veljko Vukićević2, Radiance Calmer1, Erine Louisiane Alvino Démolis1, Lionel Favre1, Hajrudin Bešić2,3, Silvan Schmid3, Josiane P. Lafleur2, Satoshi Takahama4, Julia Schmale1
1Extreme Environments Research Laboratory, École Polytechnique Féderale de Lausanne, Sion, 1951, Switzerland; 2Invisible-Light Labs GmbH, Vienna, 1040, Austria; 3Institute of Sensor and Actuator Systems, TU Wien, Vienna, 1040, Austria; 4Laboratory of Atmospheric Processes and their Impacts, École Polytechnique Féderale de Lausanne, Lausanne, 1015, Switzerland
Ultrafine particles affect climate, by growing to cloud-forming sizes, and pose health risks due to their deep body penetration. However, because of their low mass, chemical characterization of such small particles has been a challenge to date. A lot of knowledge of chemical composition has been obtained from offline measurements, where the time resolution is lowered to the filter collection time. In low-concentration environments, this can be as long as weeks. Here, we show that nanoelectromecahnical systems coupled to fourier-transform infrared spectroscopy can enable both chemical characterization of ultrafine particles and shortening collection times to minutes-hours in pristine environments.
12:15pm - 12:30pmTU2-2: 4
A Round Robin exercise of Xact 625i elemental analysis by intercomparison with reference-free PIXE and XRF techniques
Cosimo Fratticioli1,2, André Wählisch3, Brukhard Beckhoff3, Giulia Calzolai2, Claudio Crazzolara5, Massimo Chiari2, Fabio Giardi2, Armin Gross5, Franco Lucarelli1,2, Manousos-Ioannis Manousakas6, Silvia Nava1,2, Andreas Nowak4
1Department of Physics and Astronomy, Università degli Studi di Firenze, Italy; 2National Institute for Nuclear Physics (INFN), via G. Sansone 1, 50019, Sesto Fiorentino, Italy; 3Physikalisch-Technische Bundesanstalt (PTB), Abbestraße 2-12, 10587 Berlin, Germany; 4Airborne Nanoparticles (3.43), Physikalisch-Technische Bundesanstalt (PTB), Braunschweig, 38116, Germany; 5Bruker Nano GmbH, Am Studio 2D, 12489 Berlin, Germany; 6Environmental Radioactivity & Aerosol Tech. for Atmospheric & Climate Impacts, INRaSTES, National Centre of Scientific Research “Demokritos”, Ag. Paraskevi, 15310, Greece
The Xact625i instrument is increasingly used for measuring trace elements in atmospheric aerosols due to its capability to produce Near-Real-Time measurements. Despite its advantages, discrepancies with respect to reference methods (ICP-MS) highlight the need for a robust calibration approach. Results from a Round-Robin exercise involving 10 Xact625i within ACTRIS-ERIC and MI-TRAP will be presented. Partial results show strong correlations and over/underestimation for some elements. Xact625i measurements were compared with reference-free PIXE and XRF. These results will provide comprehensive information about the inter-comparability of different instruments and represent a first step towards the definition of robust QA/QC procedures for Xact625i.
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