Chinese Journal of Applied Chemistry ›› 2020, Vol. 37 ›› Issue (1): 96-102.DOI: 10.11944/j.issn.1000-0518.2020.01.190136

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Online Ozone Detection Method Based on Gas-Liquid Phase Chemiluminescence Technology

LI Jiaqia,FU Dayoua*(),WANG Zhuqinga,TAN Wenyuana,CHEN Yuqina,JI Gangyangb   

  1. aSichuan University of Science and Engineering,College of Chemical Engineering,Zigong,Sichuan 643000,China
    bBeijing Kechuang Haiguang Instrument Co.,Ltd.,Beijing 100020,China
  • Received:2019-05-13 Accepted:2019-05-13 Published:2020-01-08 Online:2020-01-08
  • Contact: FU Dayou
  • Supported by:
    Supported by the Innovation Fund of Postgraduate, Sichuan University of Science and Engineering(No.y2018057), the Sichuan Institute of Technology Talent Introduction Project(No.2016RCL17), the Sichuan Zigong City Science and Technology Bureau Project(No.2018YYJC12), the Fine Chemical Additives and Surfactants Sichuan Higher Education Funded by the Key Laboratory Project(No.2018JXY06), the Innovation Fund of Postgraduate, Sichuan University of Science and Engineering(No.y2018058), and the Zigong City Science and Technology Bureau Project(No.2017xc20)

Abstract:

Based on luminol chemiluminescence system, a self-developed online ozone concentration detector was used to establish a real-time online method for detecting ozone concentration for the determination of ozone gas at trace level. The effects of luminol, potassium hydroxide, alcohols and surfactants on the chemiluminescence intensity were investigated. The results showed that ethylene glycol (volume fraction 1.5%), methanol (volume fraction 1.5%), ethanol (volume fraction 1.0%), and glycerol (volume fraction 3.0%) were added to luminol (0.005 mol/L) and potassium hydroxide (0.05 mol/L) can significantly enhance the luminescence signal of O3 in the luminol system, and formaldehyde (volume fraction 3.0%) can effectively inhibit the interference of NO2 signal. At the same time, the detection limit of ozone was 1.26 μg/m3, the relative standard deviation was 0.32%, and the relative error was 0.75%. This ozone determination system has the advantages of stable signal, good precision, high accuracy and low detection limit. It is suitable for online continuous detection of trace O3 in the atmosphere.

Key words: luminol, gas-liquid phase, chemiluminescence, detection, ozone