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Atmospheric Measurement Techniques An interactive open-access journal of the European Geosciences Union
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Discussion papers
https://doi.org/10.5194/amt-2018-459
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/amt-2018-459
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.

Research article 14 Jan 2019

Research article | 14 Jan 2019

Review status
This discussion paper is a preprint. A revision of this manuscript was accepted for the journal Atmospheric Measurement Techniques (AMT) and is expected to appear here in due course.

Simultaneous measurement of NO and NO2 by dual-channel cavity ring down spectroscopy technique

Renzhi Hu1,*, Zhiyan Li1,2,*, Pinhua Xie1,3,5, Hao chen1, Xiaoyan Liu4, Shuaixi Liang1,2, Dan Wang6, Fengyang Wang1, Yihui Wang1,3, Chuan Lin1, Jianguo Liu1,3,5, and Wenqing Liu1,3,5 Renzhi Hu et al.
  • 1Key Lab. of Environmental Optics and Technology, Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei 230031,China
  • 2Science Island Branch of Graduate School, University of Science and Technology of China, Hefei 230026, China
  • 3School of Environmental Science and Optoelectronic Technology, University of Science and Technology of China, Hefei 230027, China
  • 4College of Pharmacy, Anhui Medical University, 81 Meis han Road, Hefei 230032, China
  • 5CAS Center for Excellence in Regional Atmospheric Environment, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen, 361000, Fujian, China
  • 6School of Mathematics and Physics, Anhui University of Technology, Ma an Shan 243032, China
  • *These authors contributed equally to this work.

Abstract. Nitric oxide (NO) and nitrogen dioxide (NO2) are relevant to air quality due to their role in tropospheric ozone (O3) production. In China, NOx emission is high and exhausted from on-road vehicles makes up 20 % of total NOx emissions. Too much NOx are harmful to the human body and animals. In order to detect the NO and NO2 emissions on road, a dual-channel CRDS system for NO2 and NO detection is reported. In this system, NO is converted to NO2 by its reaction with excess O3 in NOx channel, such that NO can be determined through the difference between two channels. The detection limits of the developed CRDS system for NO2 and NOx measurements are estimated to be about 0.030 ppb (1σ, 1 s) and 0.040 ppb (1σ, 1 s), respectively. Considering the error sources of NO2 absorption cross section and RL determination, the total uncertainty of NO2 measurements is about 5 %. The CRDS method is capable of measuring species with high sensitivity and accuracy. The performance of the system was validated against a chemiluminescence (CL) analyzer (42i, Thermo Scientific, Inc.) when measuring the NO2 standard mixtures. The results of NO2 with standard mixtures sampled showed a linear correction factor (R2) of 0.99 in a slope of 1.031 ± 0.006, with an offset of (−0.940 ± 0.323) ppb. An intercomparison between the system and a cavity-enhanced absorption spectroscopy (CEAS) instrument for NO2 measurement was also conducted alone in ambient environment. Least-squares analysis showed that the slope and intercept of the regression line are 1.042 ± 0.002 and (−0.393 ± 0.040) ppb, respectively, with a linear correlation factor of R2 = 0.99. Another intercomparison conducted between the system and the CL analyzer for NO detection also showed a good agreement within their uncertainties, with an absolute shift of (0.352 ± 0.013) ppb, a slope of 0.957 ± 0.007 and a correlation coefficient of R2 = 0.99. The measurements of on-road vehicle emission plumes by this mobile CRDS instrument show the different emission characteristics in the urban and suburban areas of Hefei. The instrument provides a new method for retrieving fast variations of NO and NO2 plumes.

Renzhi Hu et al.
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Renzhi Hu et al.
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Short summary
A dual-channel CRDS system for NO2 and NO detection is reported. The detection limits of the developed CRDS system for NO2 and NOx measurements are estimated to be about 0.030 ppb (1σ, 1 s) and 0.040 ppb (1σ, 1 s), respectively. The measurements of on-road vehicle emission plumes by this mobile CRDS instrument show the different emission characteristics in the urban and suburban areas of Hefei. The instrument provides a new method for retrieving fast variations of NO and NO2 plumes.
A dual-channel CRDS system for NO2 and NO detection is reported. The detection limits of the...
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