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Environ Sci Technol

Title:		Molecular Characterization of Oxygenated Organic Molecules and Their Dominating Roles in Particle Growth in Hong Kong
Author(s):		Zheng P; Chen Y; Wang Z; Liu Y; Pu W; Yu C; Xia M; Xu Y; Guo J; Guo Y; Tian L; Qiao X; Huang DD; Yan C; Nie W; Worsnop DR; Lee S; Wang T;
Address:		"Division of Environment and Sustainability, The Hong Kong University of Science and Technology, Kowloon, Hong Kong SAR 999077, China. Department of Civil and Environmental Engineering, The Hong Kong Polytechnic University, Kowloon, Hong Kong SAR 999077, China. Joint International Research Laboratory of Atmospheric and Earth System Research, School of Atmospheric Sciences, Nanjing University, Nanjing 210023, China. Environmental Central Facility, The Hong Kong University of Science and Technology, Kowloon, Hong Kong SAR 999077, China. Aerosol and Haze Laboratory, Beijing Advanced Innovation Center for Soft Matter Science and Engineering, Beijing University of Chemical Technology, Beijing 100084, China. Department of Civil and Environmental Engineering, Faculty of Science and Technology, University of Macau, Taipa, Macau 999078, China. State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing 100084, China. State Environmental Protection Key Laboratory of Formation and Prevention of Urban Air Pollution Complex, Shanghai Academy of Environmental Sciences, Shanghai 200233, China. Institute for Atmospheric and Earth System Research/Physics, Faculty of Science, University of Helsinki, Helsinki 00014, Finland. Aerodyne Research Inc., Billerica, Massachusetts 01821, United States"
Journal Title:		Environ Sci Technol
Year:		2023
Volume:		20230508
Issue:		20
Page Number:		7764 - 7776
DOI:		10.1021/acs.est.2c09252
ISSN/ISBN:		1520-5851 (Electronic) 0013-936X (Linking)
Abstract:		"Oxygenated organic molecules (OOMs) are critical intermediates linking volatile organic compound oxidation and secondary organic aerosol (SOA) formation. Yet, the understanding of OOM components, formation mechanism, and impacts are still limited, especially for urbanized regions with a cocktail of anthropogenic emissions. Herein, ambient measurements of OOMs were conducted at a regional background site in South China in 2018. The molecular characteristics of OOMs revealed dominant nitrogen-containing products, and the influences of different factors on OOM composition and oxidation state were elucidated. Positive matrix factorization analysis resolved the complex OOM species to factors featured with fingerprint species from different oxidation pathways. A new method was developed to identify the key functional groups of OOMs, which successfully classified the majority species into carbonyls (8%), hydroperoxides (7%), nitrates (17%), peroxyl nitrates (10%), dinitrates (13%), aromatic ring-retaining species (6%), and terpenes (7%). The volatility estimation of OOMs was improved based on their identified functional groups and was used to simulate the aerosol growth process contributed by the condensation of those low-volatile OOMs. The results demonstrate the predominant role of OOMs in contributing sub-100 nm particle growth and SOA formation and highlight the importance of dinitrates and anthropogenic products from multistep oxidation"
Keywords:		*Air Pollutants/analysis Hong Kong Nitrates Terpenes Aerosols/analysis categorization scheme chemical ionization mass spectrometer (CIMS) multifunctional oxidation products nanoparticle growth oxygenated organic molecules (OOMs) positive matrix factorizat;
Notes:		"MedlineZheng, Penggang Chen, Yi Wang, Zhe Liu, Yuliang Pu, Wei Yu, Chuan Xia, Men Xu, Yang Guo, Jia Guo, Yishuo Tian, Linhui Qiao, Xiaohui Huang, Dan Dan Yan, Chao Nie, Wei Worsnop, Douglas R Lee, Shuncheng Wang, Tao eng Research Support, Non-U.S. Gov't 2023/05/08 Environ Sci Technol. 2023 May 23; 57(20):7764-7776. doi: 10.1021/acs.est.2c09252. Epub 2023 May 8"