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Environmental Science and Pollution Research

, Volume 25, Issue 31, pp 31091–31100 | Cite as

Photochemical oxidation of di-n-butyl phthalate in atmospheric hydrometeors by hydroxyl radicals from nitrous acid

  • Yu Lei
  • Chengzhu Zhu
  • Jun Lu
  • Yongchao Zhu
  • Qiuyue Zhang
  • Tianhu Chen
  • Hongbin Xiong
Research Article
  • 39 Downloads

Abstract

The photochemical oxidation of di-n-butyl phthalate (DBP) by OH radicals from nitrous acid (HONO) in atmospheric hydrometeors was explored by two techniques, steady-state irradiation, and laser flash photolysis (LFP). The effects of atmospheric liquid parameters on DBP transformation were systematically evaluated, showing that DBP does not react with HONO directly and OH-initiated reactions are crucial steps for consumption and transformation of DBP. Two reaction channels are operative: OH addition and hydrogen atom abstraction. The overall rate constant for the reaction of DBP with OH is 5.7 × 109 M−1 s−1, and its specific rate constant for addition is 3.7 × 109 M−1 s−1 determined by using laser flash photolysis technique. Comparing the individual reaction rate constant for aromatic ring addition with the total rate constant, the majority of the OH radicals (about 65%) attack the aromatic ring. The major transformation products were identified by GC-MS, and the trends of their yields derived from both ring addition and H-abstraction with time are discussed. These results provide important insights into the photochemical transformation of DBP in atmospheric hydrometeors and contribute to atmospheric aerosol chemistry.

Keywords

Di-butyl phthalate Nitrous acid Hydroxyl radicals Kinetics Mechanisms Atmospheric hydrometeors 

Notes

Funding information

Financial support was provided by the National Natural Science Foundation of China (NSFC) (21876038) and the Key University Science Research Project of Anhui Provincial Education Department of China (KJ2017ZD46).

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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2018

Authors and Affiliations

  1. 1.Institute of Atmospheric Environment and Pollution Control, School of Resource and Environmental EngineeringHefei University of TechnologyHefeiPeople’s Republic of China
  2. 2.Center of Analysis and MeasurementHefei University of TechnologyHefeiPeople’s Republic of China

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