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Kinetics and mechanism of syringic acid degradation initiated by hydroxyl radical and sulphate radical in the aqueous phase.

Authors
  • Tong, Xin1
  • Wang, Sainan1
  • Wang, Liming2
  • 1 School of Chemistry & Chemical Engineering, South China University of Technology, Guangzhou, 510640, China. , (China)
  • 2 School of Chemistry & Chemical Engineering, South China University of Technology, Guangzhou, 510640, China; Guangdong Provincial Key Laboratory of Atmospheric Environment and Pollution Control, South China University of Technology, Guangzhou, 510006, China. Electronic address: [email protected] , (China)
Type
Published Article
Journal
Chemosphere
Publication Date
Oct 01, 2020
Volume
256
Pages
126997–126997
Identifiers
DOI: 10.1016/j.chemosphere.2020.126997
PMID: 32473466
Source
Medline
Keywords
Language
English
License
Unknown

Abstract

Syringic acid (Syr) is an abundant component in aerosol particles. Multiphase photo-oxidation in aerosol phase provides an important oxidation pathway for Syr in the atmosphere. In this work, we studied the multiphase degradation of Syr by measuring rate coefficients of its reactions with potential radical oxidants (OH and SO4-) in aqueous solutions and by theoretical calculations, and degradation mechanisms by identifying the (intermediate) products. Rate coefficients, in 109 M-1 s-1, were obtained as 32 ± 2 (pH 3) and 25 ± 2 (pH 6) for reactions with OH radical, and 1.7 ± 0.1 (pH 3) and 0.9 ± 0.02 (pH 6) for reactions with SO4-. Reactions of Syr with OH and SO4- were all in diffusion-control limit. Rate coefficients' difference under pH 6 and pH 3 in SO4- reaction was caused by Coulomb's force between negatively charged species. Theoretical calculations showed that the reaction of Syr with OH starts mainly by hydrogen atom transfer (HAT) from phenolic groups and secondly by OH addition to the aromatic ring. No product was identified in the reaction of Syr and OH radical at pH 3 due probably to the rapid mineralization of phenoxy radical formed from HAT, while products after OH additions were identified for a reaction at pH 6. On the other hand, reaction of Syr with SO4- starts by single-electron transfer (SET), forming Syr+, which can undergo hydrolysis, sulfation, and dimerization with Syr and other aromatic intermediates, etc. Dimerization products from the phenoxy-type radical were not found here. Copyright © 2020 Elsevier Ltd. All rights reserved.

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