globalchange  > 气候变化与战略
DOI: 10.1016/j.atmosenv.2019.117240
Aqueous-phase oxidation of three phenolic compounds by hydroxyl radical: Insight into secondary organic aerosol formation yields, mechanisms, products and optical properties
Author: Ye Z.; Zhuang Y.; Chen Y.; Zhao Z.; Ma S.; Huang H.; Chen Y.; Ge X.
Source Publication: Atmospheric Environment
ISSN: 1352-2310
Publishing Year: 2020
Volume: 223
Language: 英语
Keyword: Aerosols ; Combustion ; Gas chromatography ; Mass spectrometry ; Optical properties ; Oxalic acid ; Oxidation ; Aqueous phase ; Brown carbons ; Chemical compositions ; Phenolic precursors ; Reaction mechanism ; Secondary organic aerosols ; Organic carbon ; aerosol ; aerosol formation ; chemical composition ; combustion ; hydroxyl radical ; optical property ; oxidation ; phenolic compound
Subject Area: Aqueous-phase ; Brown carbon ; Chemical composition ; Phenolic precursors ; Reaction mechanisms ; Secondary organic aerosol
Abstract: This work performed a systematic investigation on the aqueous hydroxyl radical (OH) - induced photochemical oxidation of three modestly-soluble precursors from biomass combustion including 4-methylsyringol (DMP), eugenol (Eug), and 2,4,6-trimethylphenol (TRMP) under both simulated sunlight and ultraviolet (UV) light irradiations. An Aerodyne soot particle aerosol mass spectrometer (SP-AMS) was used to monitor the bulk chemical and elemental compositions of aqueous secondary organic aerosol (aqSOA) formed. AqSOA mass yields varied in ranges of 80–190% and 0–200% under sunlight and UV light conditions, respectively. AqSOA oxygen-to-carbon (O/C) ratio and carbon oxidation state increased steadily under sunlight + OH condition, but increased then decreased under UV + OH condition. Organic acids including malic acid, glycolic acid, formic acid and oxalic acid were formed, and their total accounted for ~12% of SOA mass. The UV–vis spectral change suggested formation of light-absorbing organics. Reaction pathways were proposed by combining gas chromatography-mass spectrometry (GC-MS) and SP-AMS results. Under sunlight + OH condition, oligomerization, functionalization, and fragmentation processes all involved in aqSOA evolution, with more contribution from functionalization via hydroxylation and oxygenation reactions. Reaction mechanism of UV + OH oxidation was initially dominated by functionalization then by fragmentation, indicating by the decrease of total organic carbon (TOC) contents, formation of small organic acids and low-molecular-weight products. Our work highlights that combination of SP-AMS with GC-MS is a powerful method for laboratory investigation of aqueous-phase reactions. © 2019 Elsevier Ltd
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Document Type: 期刊论文
Appears in Collections:气候变化与战略

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Affiliation: College of Chemistry and Environmental Engineering, Jiangsu University of Technology, Changzhou, 213001, China; Jiangsu Key Laboratory of Atmospheric Environment Monitoring and Pollution Control, Collaborative Innovation Center of Atmospheric Environment and Equipment Technology, School of Environmental Sciences and Engineering, Nanjing University of Information Science and Technology, Nanjing, 210044, China

Recommended Citation:
Ye Z.,Zhuang Y.,Chen Y.,et al. Aqueous-phase oxidation of three phenolic compounds by hydroxyl radical: Insight into secondary organic aerosol formation yields, mechanisms, products and optical properties[J]. Atmospheric Environment,2020-01-01,223
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