Secondary reactions of aromatics-derived oxygenated organic molecules lead to plentiful highly oxygenated organic molecules within an intraday OH exposure DOI Creative Commons
Yuwei Wang, Chuang Li, Ying Zhang

et al.

Atmospheric chemistry and physics, Journal Year: 2024, Volume and Issue: 24(13), P. 7961 - 7981

Published: July 12, 2024

Abstract. Highly oxygenated organic molecules (HOMs) can participate in new particle formation (NPF) and enhance growth of newly formed particles partially because their low volatility. Previous studies have shown HOMs via autoxidation reactions RO2 intermediates generated by OH-initiated oxidation anthropogenic volatile compounds (VOCs). It was also suggested that multi-generation OH could be an important source for aromatics-derived HOMs. However, our understanding the generation is still insufficient, especially mechanisms, which determine molar yields are essential to establishment global chemical box models related In this study, with a potential aerosol mass flow reactor (PAM OFR), two series experiments 1,3,5-trimethylbenzene (1,3,5-TMB) were conducted investigate first series, evolution products 1,3,5-TMB exposure range (0.5–5.0) × 1010 cm−3 s, equivalent 0.7–6.9 h at concentration ([OH]) 2×106 cm−3, investigated nitrate-based ionization spectrometer Vocus proton-transfer-reaction spectrometer, indicating significant secondary chemistry during aging stabilized first-generation within intraday various lower double-bond equivalence (DBE). addition, organonitrates, after introduction NOx into reaction systems, further confirmed existence such reactions. The second same residence time but much [OH], shows [OH] as 1.06×107 53 i.e., around 5.86×108 s. Our study suggests role aromatics if these survived long enough ambient atmosphere elucidates detailed mechanisms certain HOM products.

Language: Английский

Study of secondary organic aerosol formation and aging using ambient air in an oxidation flow reactor during high pollution events over Delhi DOI
Vikas Goel, Nidhi Tripathi, Mansi Gupta

et al.

Environmental Research, Journal Year: 2024, Volume and Issue: 251, P. 118542 - 118542

Published: Feb. 23, 2024

Language: Английский

Citations

3
SO<sub>2</sub> and NH<sub>3</sub> emissions enhance organosulfur compounds and fine particle formation from the photooxidation of a typical aromatic hydrocarbon DOI Creative Commons
Zhaomin Yang, Li Xu, Narcisse T. Tsona

et al.

Atmospheric chemistry and physics, Journal Year: 2021, Volume and Issue: 21(10), P. 7963 - 7981

Published: May 25, 2021

Abstract. Aromatic hydrocarbons can dominate the volatile organic compound budget in urban atmosphere. Among them, 1,2,4-trimethylbenzene (TMB), mainly emitted from solvent use, is one of most important secondary aerosol (SOA) precursors. Although atmospheric SO2 and NH3 levels affect formation, influenced extent their impact detailed driving mechanisms are not well understood. The focus present study to examine chemical compositions formation SOA TMB photooxidation by and/or NH3. Here, we show that emission could considerably enhance particle due SO2-induced sulfate generation acid-catalyzed heterogeneous reactions. Orbitrap mass spectrometry measurements revealed only typical products but also hitherto unidentified organosulfates (OSs) SO2-added experiments. OSs designated as being unknown origin earlier field were detected SOA, indicating might be originated photooxidation. For NH3-involved experiments, results demonstrated a positive correlation between volume number concentrations. effects on composition slight under SO2-free conditions stronger presence SO2. A series multifunctional with carbonyl, alcohols, nitrate functional groups tentatively characterized experiments based infrared spectra analysis. Plausible pathways proposed for phase. volatility distributions products, estimated using parameterization methods, suggested gradually condense onto nucleation particles contribute growth. Our suggest strict control emissions remarkably reduce burden Updating aromatic oxidation mechanism models result more accurate treatment regions considerable SO2, NH3, aromatics emissions.

Language: Английский

Citations

19
Secondary organic aerosol formation from monocyclic aromatic hydrocarbons: insights from laboratory studies DOI
Zhaomin Yang, Lin Du, Yongjie Li

et al.

Environmental Science Processes & Impacts, Journal Year: 2022, Volume and Issue: 24(3), P. 351 - 379

Published: Jan. 1, 2022

This review summarizes in detail the current knowledge chemical compositions, formation mechanisms, and physicochemical properties of secondary organic aerosols formed from monocyclic aromatic hydrocarbons.

Language: Английский

Citations

14
Chamber investigation of the formation and transformation of secondary organic aerosol in mixtures of biogenic and anthropogenic volatile organic compounds DOI Creative Commons
Aristeidis Voliotis, Mao Du, Yu Wang

et al.

Atmospheric chemistry and physics, Journal Year: 2022, Volume and Issue: 22(21), P. 14147 - 14175

Published: Nov. 4, 2022

Abstract. A comprehensive chamber investigation of photochemical secondary organic aerosol (SOA) formation and transformation in mixtures anthropogenic (o-cresol) biogenic (α-pinene isoprene) volatile compound (VOC) precursors the presence NOx inorganic seed particles was conducted. To enable direct comparison across systems, initial concentration (hence reactivity) systems towards dominant OH oxidant adjusted. Comparing experiments conducted single-precursor at various reactivity levels (referenced to a nominal base case VOC concentration, e.g. halving for 1/2 experiment) as well their binary ternary mixtures, we show that molecular interactions from mixing can be investigated discuss challenges interpretation. The observed average SOA particle mass yields (the produced consumed) descending order were found following systems: α-pinene (32 ± 7 %), α-pinene–o-cresol (28 9 (21 5 α-pinene–isoprene (16 1 1/3 (15 4 o-cresol (13 3 α-pinene–o-cresol–isoprene (11 o-cresol–isoprene (6 2 isoprene (0 0 %). We find clear suppression yield when it is mixed with isoprene, whilst no or enhancement similarly isoprene. system appeared increased compared calculated based on additivity, measured predicted comparable. However, which more than one precursor contributes unclear whether changes potential are attributable physical chemical interactions, since reference basis complex. Online offline composition volatility, water uptake, “phase” behaviour measurements used interpret introduced detailed elsewhere.

Language: Английский

Citations

14
Secondary reactions of aromatics-derived oxygenated organic molecules lead to plentiful highly oxygenated organic molecules within an intraday OH exposure DOI Creative Commons
Yuwei Wang, Chuang Li, Ying Zhang

et al.

Atmospheric chemistry and physics, Journal Year: 2024, Volume and Issue: 24(13), P. 7961 - 7981

Published: July 12, 2024

Abstract. Highly oxygenated organic molecules (HOMs) can participate in new particle formation (NPF) and enhance growth of newly formed particles partially because their low volatility. Previous studies have shown HOMs via autoxidation reactions RO2 intermediates generated by OH-initiated oxidation anthropogenic volatile compounds (VOCs). It was also suggested that multi-generation OH could be an important source for aromatics-derived HOMs. However, our understanding the generation is still insufficient, especially mechanisms, which determine molar yields are essential to establishment global chemical box models related In this study, with a potential aerosol mass flow reactor (PAM OFR), two series experiments 1,3,5-trimethylbenzene (1,3,5-TMB) were conducted investigate first series, evolution products 1,3,5-TMB exposure range (0.5–5.0) × 1010 cm−3 s, equivalent 0.7–6.9 h at concentration ([OH]) 2×106 cm−3, investigated nitrate-based ionization spectrometer Vocus proton-transfer-reaction spectrometer, indicating significant secondary chemistry during aging stabilized first-generation within intraday various lower double-bond equivalence (DBE). addition, organonitrates, after introduction NOx into reaction systems, further confirmed existence such reactions. The second same residence time but much [OH], shows [OH] as 1.06×107 53 i.e., around 5.86×108 s. Our study suggests role aromatics if these survived long enough ambient atmosphere elucidates detailed mechanisms certain HOM products.

Language: Английский

Citations

2