Partitioning of Organonitrates in the Production of Secondary Organic Aerosols from α-Pinene Photo-Oxidation

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review

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Author(s)

  • Eleonora Aruffo
  • Junfeng Wang
  • Jianhuai Ye
  • Paul Ohno
  • Matthew Stewart
  • Karena McKinney
  • Piero Di Carlo
  • Scot T. Martin

Detail(s)

Original languageEnglish
Pages (from-to)5421-5429
Journal / PublicationEnvironmental Science and Technology
Volume56
Issue number9
Online published12 Apr 2022
Publication statusPublished - 3 May 2022
Externally publishedYes

Link(s)

Abstract

The chemical pathways for the production of secondary organic aerosols (SOA) are influenced by the concentration of nitrogen oxides (NOx), including the production of organonitrates (ON). Herein, a series of experiments conducted in an environmental chamber investigated the production and partitioning of total organonitrates from α-pinene photo-oxidation from <1 to 24 ppb NOx. Gas-phase and particle-phase organonitrates (gON and pON, respectively) were measured by laser-induced fluorescence (LIF). The composition of the particle phase and the particle mass concentration were simultaneously characterized by online aerosol mass spectrometry. The LIF and MS measurements of pON concentrations had a Pearson correlation coefficient of 0.91 from 0.3 to 1.1 μg m-3. For 1-6 ppb NOx, the yield of SOA particle mass concentration increased from 0.02 to 0.044 with NOconcentration. For >6 ppb NOx, the yield steadily dropped, reaching 0.034 at 24 ppb NOx. By comparison, the yield of pON steadily increased from 0.002 to 0.022 across the range of investigated NOconcentrations. The yield of gON likewise increased from 0.005 to 0.148. The gas-to-particle partitioning ratio (pON/(pON + gON)) depended strongly on the NOx concentration, changing from 0.27 to 0.13 as the NOx increased from <1 to 24 ppb. In the atmosphere, there is typically a cross-over point between clean and polluted conditions that strongly affects SOA production, and the results herein quantitatively identify 6 ppb NOx as that point for α-pinene photo-oxidation under these study conditions, including the production and partitioning of organonitrates. The trends in SOA yield and partitioning ratio as a function of NOx occur because of the changes in pON volatility. © 2022 American Chemical Society. All rights reserved.

Research Area(s)

  • AMS, chamber experiments, organonitrates, SOA, TDLIF, α-pinene

Citation Format(s)

Partitioning of Organonitrates in the Production of Secondary Organic Aerosols from α-Pinene Photo-Oxidation. / Aruffo, Eleonora; Wang, Junfeng; Ye, Jianhuai et al.
In: Environmental Science and Technology, Vol. 56, No. 9, 03.05.2022, p. 5421-5429.

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review

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