A novel calibration method for atmospheric NO 3 radical via high reflectivity cavity

A novel calibration method for atmospheric NO 3 radical via high reflectivity cavity Dan Wang http://orcid.org/0000-0001-9277-5652 Renzhi Hu Pinhua Xie Zhiyan Li Abstract

The NO 3 radical is one of the important indicators of atmospheric oxidation capability at night, and its accurate detection has been extensively investigated. High reflectivity cavity instruments, such as cavity ring-down spectroscopy (CRDS) and cavity-enhanced absorption spectroscopy (CEAS), are generally employed for NO 3 radical detection. However, sampling detection easily adsorbs radicals on surfaces, which causes complications and even additional loss. According to the chemical conversion relationship between NO 3 radical and NO 2 , a method of absolute calibration different from the previous relative calibration method is applied by combining the CRDS and CEAS instruments for the NO 3 radical and NO 2 , respectively. Experimental results show that the overall transmission efficiency of the NO 3 radical for the CRDS instrument is approximately 75% ± 9% at a flow rate of 6.5 SLPM. Comparative experiments between the two methods are conducted to estimate the accuracy of this method. The achieved results indicate that absolute calibration is a reliable and feasible method for radical calibration in the laboratory. Furthermore, the absolute calibration method has the potential to realize accurate real-time calibration in field measurements.
05 11 2020 08 01 2020 085801 http://dx.doi.org/10.1088/crossmark-policy iopscience.iop.org A novel calibration method for atmospheric NO 3 radical via high reflectivity cavity Measurement Science and Technology paper © 2020 The Author(s). Published by IOP Publishing Ltd 2020-01-14 2020-04-09 2020-05-11 Natural Science Foundation of Anhui Province of China 1908085QD159 Open Fund of Key Laboratory of Environmental Optics and Technology, Chinese Academy of Sciences 2005DP173065-2016-03 National Natural Science Foundation of China http://dx.doi.org/10.13039/501100001809 http://dx.doi.org/10.13039/501100001809 41571130023 http://creativecommons.org/licenses/by/4.0 https://iopscience.iop.org/info/page/text-and-data-mining 10.1088/1361-6501/ab8833 https://iopscience.iop.org/article/10.1088/1361-6501/ab8833 https://iopscience.iop.org/article/10.1088/1361-6501/ab8833/pdf https://iopscience.iop.org/article/10.1088/1361-6501/ab8833/pdf https://iopscience.iop.org/article/10.1088/1361-6501/ab8833 https://iopscience.iop.org/article/10.1088/1361-6501/ab8833/pdf https://iopscience.iop.org/article/10.1088/1361-6501/ab8833/pdf https://iopscience.iop.org/article/10.1088/1361-6501/ab8833/pdf https://iopscience.iop.org/article/10.1088/1361-6501/ab8833 https://iopscience.iop.org/article/10.1088/1361-6501/ab8833/pdf https://iopscience.iop.org/article/10.1088/1361-6501/ab8833/pdf https://iopscience.iop.org/article/10.1088/1361-6501/ab8833 https://iopscience.iop.org/article/10.1088/1361-6501/ab8833 https://iopscience.iop.org/article/10.1088/1361-6501/ab8833/pdf Rev. 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