SO₂ enhances aerosol formation from anthropogenic volatile organic compound ozonolysis by producing sulfur-containing compounds

Atmospheric chemistry and physics, Journal Year: 2023, Volume and Issue: 23(1), P. 417 - 430

Published: Jan. 11, 2023

Abstract. Sulfur dioxide (SO2) can affect aerosol formation in the atmosphere, but underlying mechanisms remain unclear. Here, we investigate and composition from ozonolysis of cyclooctene with without SO2 addition a smog chamber. Liquid chromatography equipped high-resolution tandem mass spectrometry measurements indicates that monomer carboxylic acids corresponding dimers acid anhydride aldol structures are important components particles formed absence SO2. A 9.4–12.6-times increase particle maximum number concentration is observed presence 14–192 ppb This largely attributed to sulfuric (H2SO4) reactions stabilized Criegee intermediates In addition, organosulfates (OSs) detected SO2, which likely products heterogeneous oxygenated species H2SO4. The molecular OSs also identified based on analysis. It should be noted some these have been found previous field studies were classified as compounds unknown sources or structures. less volatile than their precursors therefore more effective contributors growth, partially leading volume under SO2-presence conditions. Our results provide an in-depth molecular-level insight into how alters composition.

Language: Английский

---

Influence of COVID-19 lockdown on the variation of organic aerosols: Insight into its molecular composition and oxidative potential

Environmental Research, Journal Year: 2021, Volume and Issue: 206, P. 112597 - 112597

Published: Dec. 24, 2021

Language: Английский

---

Biogenic secondary organic aerosol formation in an urban area of eastern central India: Seasonal variation, size distribution and source characterization

Environmental Research, Journal Year: 2021, Volume and Issue: 195, P. 110802 - 110802

Published: Jan. 28, 2021

Language: Английский

---

Formation mechanism of secondary organic aerosol in aerosol liquid water: A review

Chinese Science Bulletin (Chinese Version), Journal Year: 2020, Volume and Issue: 65(28-29), P. 3118 - 3133

Published: Aug. 21, 2020

Secondary organic aerosol (SOA) is the main component of PM2.5, with great impact on regional air quality and global climate. The traditional view that SOA forms through partitioning photochemical processing involving volatile compounds (VOCs) cannot fully explain measured concentrations. It has been increasing recognized can form aqueous reactions in recent years. Besides cloud/fog chemistry, (aqSOA) formation liquid water become one frontier scientific problems atmospheric chemistry. AqSOA precursors enter into phase uptake to wet particles, participate inside then aqSOA such as sulfur nitrogen compounds. This paper provides an overview precursors, mechanism current research methods aqSOA. include oxidants (OH, HO2, O3, etc.), anthropogenic biogenic VOCs related gas-phase oxidation products. Aerosol influence aerosols, but researches are limited. OH coefficient ( γ OH) different kinds aerosols varies from 0.02 2.41, depending chemical composition relative humidity. For VOCs, take methylglyoxal example, theoretical MGLY) differ by 4 5 orders magnitude. may change ionic strength, diffusion limitation viscosity how these affect process remain poorly understood. Based previous analyses aqueous-phase be divided radical non-radical reactions. Aqueous-phase resemble general. However, there also unique phase: efficient conversion aldehydes carboxylic acids, rapid carboxylate, induced oligomerization. Recent studies pay attention role other like singlet oxygen, peroxyl radicals, peroxides, molecular oxygen (1O2*), triplet excited states (3C*). Non-radical hemiacetal formation, aldol condensation, imine types (anhydride organosulfate etc.). Most lead high weight Although a lot investigations have taken explore mechanism, majority laboratory studies, because limit technology field measurements. Laboratory simulation includes bulk solution reaction chamber experiments. Bulk simulate typical ambient well, so nowadays used more widely. There two chambers: smog flow tube, differing volume simulated timescale. appropriate application results observations model framework needs further efforts. Moreover, key factor enabled progress chemistry development mass-spectrometric methods, mainly including electrospray ionization-mass spectrometry (ESI-MS), Fourier transform ion cyclotron resonance ionization mass (FTICR-MS), (CIMS) extractive (EESI-MS). These techniques realize accurate level identification complex But quantification remains thorny issue, owing absence available authentic standards. Finally, possible future directions regarding discussed.

Language: Английский

---

Assessing the influence of environmental conditions on secondary organic aerosol formation from a typical biomass burning compound

Journal of Environmental Sciences, Journal Year: 2022, Volume and Issue: 114, P. 136 - 148

Published: Jan. 15, 2022

Language: Английский

---