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Peroxyacetyl nitrate measurements by thermal dissociation–chemical ionization mass spectrometry in an urban environment: performance and characterizations

  • Xinfeng Wang
  • Tao Wang
  • Likun Xue
  • Wei Nie
  • Zheng Xu
  • Steven C. N. Poon
  • Wenxing Wang
Research Article

Abstract

Peroxyacetyl nitrate (PAN) is an important indicator of photochemical smog and has adverse effects on human health and vegetation growth. A rapid and highly selective technique of thermal dissociation–chemical ionization mass spectrometry (TD-CIMS) was recently developed to measure the abundance of PAN in real time; however, it may be subject to artifact in the presence of nitric oxide (NO). In this study, we tested the interference of the PAN signal induced by NO, evaluated the performance of TD-CIMS in an urban environment, and investigated the concentration and formation of PAN in urban Hong Kong. NO caused a significant underestimation of the PAN signal in TD-CIMS, with the underestimation increasing sharply with NO concentration and decreasing slightly with PAN abundance. A formula was derived to link the loss of PAN signal with the concentrations of NO and PAN, which can be used for data correction in PAN measurements. The corrected PAN data from TDCIMS were consistent with those from the commonly used gas chromatography with electron capture detection, which confirms the utility of TD-CIMS in an urban environment in which NO is abundant. In autumn of 2010, the hourly average PAN mixing ratio varied from 0.06 ppbv to 5.17 ppbv, indicating the occurrence of photochemical pollution in urban Hong Kong. The formation efficiency of PAN during pollution episodes was as high as 3.9 to 5.9 ppbv per 100 ppbv ozone. The efficiency showed a near-linear increase with NO x concentration, suggesting a control policy of NOx reduction for PAN pollution.

Keywords

TD-CIMS Peroxyacetyl nitrate Interference Photochemical pollution Formation efficiency 

Notes

Acknowledgments

This work was supported by the Environment and Conservation Fund of Hong Kong (Project No. 2009-07), National Natural Science Foundation of China (Grant Nos. 41275123, 21407094 and 91544213), China Postdoctoral Science Foundation (No. 2014M561932), and the Jiangsu Collaborative Innovation Center for Climate Change. The authors thank Dr. Pamela Holt for proofreading the manuscript.

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Copyright information

© Higher Education Press and Springer-Verlag Berlin Heidelberg 2017

Authors and Affiliations

  • Xinfeng Wang
    • 1
  • Tao Wang
    • 1
    • 2
  • Likun Xue
    • 1
  • Wei Nie
    • 3
  • Zheng Xu
    • 3
  • Steven C. N. Poon
    • 2
  • Wenxing Wang
    • 1
  1. 1.Environment Research InstituteShandong UniversityJinanChina
  2. 2.Department of Civil and Environmental EngineeringHong Kong Polytechnic UniversityHong KongChina
  3. 3.Institute for Climate and Global Change Research & School of Atmospheric SciencesNanjing UniversityNanjingChina

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