Volume 7 Issue 1
Jan.  2017
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QI Xuekui, WANG Xinxin, ZHANG Tingting, WANG Yu, LIU Yanju, WU Yanwen, SUN Zhenquan. Conditions optimization and application for determining concentrations of HNO3 and HNO2 in atmosphere of Beijing by annular denuders method[J]. Journal of Environmental Engineering Technology, 2017, 7(1): 120-124. DOI: 10.3969/j.issn.1674-991X.2017.01.018
Citation: QI Xuekui, WANG Xinxin, ZHANG Tingting, WANG Yu, LIU Yanju, WU Yanwen, SUN Zhenquan. Conditions optimization and application for determining concentrations of HNO3 and HNO2 in atmosphere of Beijing by annular denuders method[J]. Journal of Environmental Engineering Technology, 2017, 7(1): 120-124. DOI: 10.3969/j.issn.1674-991X.2017.01.018
shu

Conditions optimization and application for determining concentrations of HNO3 and HNO2 in atmosphere of Beijing by annular denuders method

  • 1.

    Beijing Center for Physical and Chemical Analysis, Beijing 100089, China

  • 2.

    Beijing Milu Ecological Research Centre, Beijing 100076, China

  • 3.

    Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190, Chin

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  • Received Date: May 24, 2016
  • Published Date: January 19, 2017
    Graphical Abstract
    • Abstract
  • In order to study the pollution characteristics of HNO3 and HNO2 in ambient air of Beijing City, the experiments for determining the optimal concentrations of annular denuders coatings were performed, and application study carried out in Beijing in the autumn of 2014. The results showed that when the concentration of Na2CO3 coating solution was 2%, the removal rate of acid gases in the atmosphere reached over 90%. The concentrations of HNO3 and HNO2 in air sampled in downtown Beijing were determined by the optimization approach. The concentrations of HNO3 and HNO2 in the measurement period ranged from 0.77 to 3.23 μg/m 3 and from 1.12 to 5.51 μg/m 3, with an average value of 2.33 μg/m 3 and 2.96 μg/m 3, respectively. HNO2 concentration was higher than that of HNO3 in the study area. The weak light during sampling might result in HNO2 photolysis reduction. Also, because of the sampling point nearby trunk road, the homo- and heterogeneous reactions of NOx from automobile exhaust may lead to a higher HNO2 concentration. The highest concentration of HNO3 occurred in haze day, followed by sunny day, while HNO2 had the highest concentration in haze day, which was far more than that in sunny day.
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    • References (17)
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