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Title: INVESTIGATIONS OF POTENTIALLY HARMFUL LIMONENE PHOTOOXIDATION PRODUCTS UNDER NOX AND NOX-FREE ATMOSPHERIC SIMULATED CONDITIONS
INVESTIGATIONS OF POTENTIALLY HARMFUL LIMONENE PHOTOOXIDATION PRODUCTS UNDER NOX AND NOX-FREE ATMOSPHERIC SIMULATED CONDITIONS

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Alina Giorgiana Negru; Claudiu Roman ; Cornelia Amarandei; Cecilia Arsene ; Romeo Iulian Olariu
10.5593/sgem2023V/4.2/s19.35
10.5593/sgem2023v/4.2
1314-2704
978-619-7603-65-1
English
23
4.2
•    Prof. DSc. Oleksandr Trofymchuk, UKRAINE 
•    Prof. Dr. hab. oec. Baiba Rivza, LATVIA
Air Pollution and Climate Change
Given the ubiquity of limonene in cleaning and cosmetic products, investigating its gasphase oxidation products from reactions with OH radicals and ozone has become important for human health. The present study investigates limonene gas-phase reaction with OH radicals under controlled NOx or NOx-free conditions using facilities from the 760 L Environmental Simulation Chamber made of Quartz (ESC-Q-UAIC) together with state-of-the-art instruments such as proton-transfer-reaction time-of-flight mass spectrometer (PTR-ToF-MS, model 6000 X2, IONICON). The obtained kinetic results (klimonene+OH = (16.42 ± 2.20) ? 10-11 cm3?molecule-1?s-1), based on the relative rate techniques with 1,3,5-trimethylbenzene and cyclohexene as reference compounds, are in good agreement with the previous kinetic studies. The PTR-ToF-MS mass spectra acquired within the NOx-free experiments revealed signals at mass-to-charge ratios of 101.060, 139.112, and 169.122, that may be assigned to potentially harmful oxidation products, namely 4-oxopentanal (C5H8O2), 4-acetyl-1-methylcyclohexene (C9H14O), and 3-isopropenyl-6-oxo-heptanal (C10H16O2), respectively. Additionally, observed differences between NOx and NOx-free experiments highlight that NOx strongly suppresses the formation of secondary organic aerosols during limonene oxidation and favours the formation of 4-acetyl-1-methylcyclohexene.
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This work was supported by a grant of the “Alexandru Ioan Cuza” University of Iasi, within the Research Grants program, Grant UAIC, code GI-UAIC-2022-04. The authors acknowledge the Operational Program Competitiveness 2014-2020, Axis 1, under POC/448/1/1 research infrastructure projects for public R&D institutions/sections F 2018, through the Research Center with Integrated Techniques for Atmospheric Aerosol Investigation in Romania (RECENT AIR) project, under grant agreement MySMIS no. 127324. A.G.N. thanks the European Social Fund, through Operational Programme Human Capital 2014-2020, project number POCU/993/6/13/153322, project title “Educational and training support for PhD students and young researchers in preparation for insertion into the labor market”.
conference
https://doi.org/10.5593/sgem2023V/4.2/s19.35
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Proceedings of 23rd International Multidisciplinary Scientific GeoConference SGEM 2023
23rd International Multidisciplinary Scientific GeoConference SGEM 2023, 28-30 November, 2023
Proceedings Paper
STEF92 Technology
International Multidisciplinary Scientific GeoConference-SGEM
SWS Scholarly Society; Acad Sci Czech Republ; Latvian Acad Sci; Polish Acad Sci; Russian Acad Sci; Serbian Acad Sci and Arts; Natl Acad Sci Ukraine; Natl Acad Sci Armenia; Sci Council Japan; European Acad Sci, Arts and Letters; Acad Fine Arts Zagreb Croatia; Croatian Acad Sci and Arts; Acad Sci Moldova; Montenegrin Acad Sci and Arts; Georgian Acad Sci; Acad Fine Arts and Design Bratislava; Russian Acad Arts; Turkish Acad Sci.
291-298
28-30 November, 2023
website
9461
limonene, OH radicals, gas-phase reaction rate, gas-phase oxidation products, secondary organic aerosols, PTR-ToF-MS