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Atmospheric Measurement Techniques An interactive open-access journal of the European Geosciences Union
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Preprints
https://doi.org/10.5194/amt-2020-308
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/amt-2020-308
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

  27 Oct 2020

27 Oct 2020

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This preprint is currently under review for the journal AMT.

Study on the measurement of isoprene by Differential Optical Absorption Spectroscopy

Song Gao1,4, Shanshan Wang1,2, Chuanqi Gu1, Ruifeng Zhang1, Yanlin Guo1, Yuhao Yan1, and Bin Zhou1,2,3 Song Gao et al.
  • 1Shanghai Key Laboratory of Atmospheric Particle Pollution and Prevention (LAP3), Department of Environmental Science and Engineering, Fudan University, Shanghai 200438, China
  • 2Institute of Eco-Chongming (IEC), No. 20 Cuiniao Road, Shanghai 202162, China
  • 3Institute of Atmospheric Sciences, Fudan University, Shanghai, 200433, China
  • 4Shanghai Environmental Monitoring Center, Shanghai, 200235, China

Abstract. In this paper, the continuous on-line measurements of isoprene in the atmosphere have been carried out by using the Differential Optical Absorption Spectroscopy (DOAS) in the band of 202.71–227.72 nm for the first time. Under the zero optical path in the laboratory, different equivalent concentrations of isoprene were measured by the combination of known concentration gas and series calibration cells. The correlation between the measured concentrations and the equivalent concentrations was 0.9996, and the slope was 1.065. The correlation coefficient between DOAS and on-line VOCs instrument is 0.85 and the slope is 0.86 in the comparison of 23 days field observation. It is estimated that the detection limit of isoprene with DOAS is about 0.1 ppb at an optical path of 75 m, and it is verified that isoprene could be measured in the ultraviolet absorption band using DOAS method with high temporal resolution and low maintenance cost.

Song Gao et al.

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Song Gao et al.

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