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ACS Earth Space Chem

Title:		Detecting and Characterizing Particulate Organic Nitrates with an Aerodyne Long-ToF Aerosol Mass Spectrometer
Author(s):		Graeffe F; Heikkinen L; Garmash O; Aijala M; Allan J; Feron A; Cirtog M; Petit JE; Bonnaire N; Lambe A; Favez O; Albinet A; Williams LR; Ehn M;
Address:		"Institute for Atmospheric and Earth System Research/Physics, Faculty of Science, University of Helsinki, Helsinki00014, Finland. Department of Environmental Science and Bolin Centre for Climate Research, Stockholm University, StockholmSE-10691, Sweden. Aerosol Physics Laboratory, Physics Unit, Tampere University, Tampere33014, Finland. Department of Earth and Environmental Sciences and National Centre for Atmospheric Science (NCAS), University of Manchester, Oxford Road, ManchesterM13 9PL, U.K. Univ Paris Est Creteil and Universite Paris Cite, CNRS, LISA, Creteil, ParisF-94010, France. Laboratoire des Sciences du Climat et de l'Environnement (LSCE), Gif-sur-Yvette91191, France. Aerodyne Research Inc., Billerica, Massachusetts01821, United States. Institut National de l'Environnement Industriel et des Risques (INERIS), Verneuil-en-Halatte60550, France"
Journal Title:		ACS Earth Space Chem
Year:		2023
Volume:		20221222
Issue:		1
Page Number:		230 - 242
DOI:		10.1021/acsearthspacechem.2c00314
ISSN/ISBN:		2472-3452 (Print) 2472-3452 (Electronic)
Abstract:		"Particulate organic nitrate (pON) can be a major part of secondary organic aerosol (SOA) and is commonly quantified by indirect means from aerosol mass spectrometer (AMS) data. However, pON quantification remains challenging. Here, we set out to quantify and characterize pON in the boreal forest, through direct field observations at Station for Measuring Ecosystem Atmosphere Relationships (SMEAR) II in Hyytiala, Finland, and targeted single-precursor laboratory studies. We utilized a long time-of-flight AMS (LToF-AMS) for aerosol chemical characterization, with a particular focus to identify C (x) H (y) O (z) N(+) ('CHON(+)') fragments. We estimate that during springtime at SMEAR II, pON (including both the organic and nitrate part) accounts for approximately 10% of the particle mass concentration (calculated by the NO(+)/NO(2) (+) method) and originates mainly from the NO(3) radical oxidation of biogenic volatile organic compounds. The majority of the background nitrate aerosol measured is organic. The CHON(+) fragment analysis was largely unsuccessful at SMEAR II, mainly due to low concentrations of the few detected fragments. However, our findings may be useful at other sites as we identified 80 unique CHON(+) fragments from the laboratory measurements of SOA formed from NO(3) radical oxidation of three pON precursors (beta-pinene, limonene, and guaiacol). Finally, we noted a significant effect on ion identification during the LToF-AMS high-resolution data processing, resulting in too many ions being fit, depending on whether tungsten ions (W(+)) were used in the peak width determination. Although this phenomenon may be instrument-specific, we encourage all (LTOF-) AMS users to investigate this effect on their instrument to reduce the possibility of incorrect identifications"
Keywords:
Notes:		"PubMed-not-MEDLINEGraeffe, Frans Heikkinen, Liine Garmash, Olga Aijala, Mikko Allan, James Feron, Anais Cirtog, Manuela Petit, Jean-Eudes Bonnaire, Nicolas Lambe, Andrew Favez, Olivier Albinet, Alexandre Williams, Leah R Ehn, Mikael eng 2023/01/28 ACS Earth Space Chem. 2022 Dec 22; 7(1):230-242. doi: 10.1021/acsearthspacechem.2c00314. eCollection 2023 Jan 19"