Formation and Evolution of aqSOA from Aqueous-Phase Reactions of Phenolic Carbonyls : Comparison between Ammonium Sulfate and Ammonium Nitrate Solutions

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

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Author(s)

  • Dan Dan Huang
  • Qi Zhang
  • Heidi H. Y. Cheung
  • Lu Yu
  • Shan Zhou
  • Cort Anastasio
  • Jeremy D. Smith

Related Research Unit(s)

Detail(s)

Original languageEnglish
Pages (from-to)9215-9224
Journal / PublicationEnvironmental Science and Technology
Volume52
Issue number16
Online published9 Jul 2018
Publication statusPublished - 21 Aug 2018

Abstract

We investigate the effects of sulfate and nitrate on the formation and evolution of secondary organic aerosol formed in the aqueous phase (aqSOA) from photooxidation of two phenolic carbonyls emitted from wood burning. AqSOA was formed efficiently from the photooxidation of both syringaldehyde (C9H10O4) and acetosyringone (C10H12O4) in ammonium sulfate and ammonium nitrate solutions, with mass yields ranging from 30% to 120%. Positive matrix factorization on the organic mass spectra acquired by an Aerosol Mass Spectrometer revealed a combination of functionalization, oligomerization and fragmentation processes in the chemical evolution of aqSOA. Functionalization and oligomerization dominated in the first 4 hours of reaction, with phenolic oligomers and their derivatives significantly contributing to aqSOA formation; andoxidation of the first-generation products led to an abundance of oxygenated ring-opening products. Degradation rates of syringaldehyde and acetosyringone in nitrate solutions were 1.5 and 3.5 times faster than rates in sulfate solutions, and aqSOA yields in nitrate experiments are twice as high as in sulfate experiments. Nitrate likely promoted the reactions because it is a photolytic source of OH radicals, while sulfate is not, highlighting the importance of aerosol-phase nitrate in the formation of aqSOA by facilitating the photooxidation of organic precursors.

Citation Format(s)

Formation and Evolution of aqSOA from Aqueous-Phase Reactions of Phenolic Carbonyls : Comparison between Ammonium Sulfate and Ammonium Nitrate Solutions. / Huang, Dan Dan; Zhang, Qi; Cheung, Heidi H. Y.; Yu, Lu; Zhou, Shan; Anastasio, Cort; Smith, Jeremy D.; Chan, Chak K.

In: Environmental Science and Technology, Vol. 52, No. 16, 21.08.2018, p. 9215-9224.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review