Broadband cavity enhanced absorption spectroscopy for measuring atmospheric NO3 radical

doi:10.7498/aps.70.20201066

	Broadband cavity enhanced absorption spectroscopy for measuring atmospheric NO3 radical
	Duan Jun 2; Tang Ke 2; Qin Min 2; Wang Dan 1; Wang Mu-Di 3; Fang Wu 2; Meng Fan-Hao 2; Xie Pin-Hua 2,4,5; Liu Jian-Guo 2,4,5; Liu Wen-Qing 2,4,5
刊名	ACTA PHYSICA SINICA
	2021-01-05
卷号	70
关键词	NO3 BBCEAS high sensitivity
ISSN号	1000-3290
DOI	10.7498/aps.70.20201066
通讯作者	Qin Min(mqin@aiofm.ac.cn)
英文摘要	NO3 radical is the most important oxidant in atmospheric chemistry at night, and it controls the oxidation and removal of various trace gas components in the atmosphere. The understanding of the chemical process of NO3 radical is of great significance for studying the atmospheric pollution processes such as haze. The NO3 radical has a low concentration and strong activity, so it is relatively difficult to measure accurately. We report here in this paper an instrument for unambiguously measuring NO3 based on broadband cavity enhanced absorption spectroscopy (BBCEAS). To achieve the robust performance and system stability under diverse conditions, this BBCEAS instrument has been developed, with efficient sampling, and resistance against vibration and temperature change improved, and the BBCEAS instrument also has low-power consumption. The 660-nm-wavelemngth light-emitting diode (LED) is used as a light source of the BBCEAS system. The sampling gas path with low loss and suitable for domestic high-particle environment is designed. Through the LED light source test, the optimal working current and temperature can be obtained to achieve the acquisition of NO3 absorption spectrum with high signal-to-noise ratio. Considering the fact that the water vapor absorption is an important interference factor for the measurement of NO3 radical by BBCEAS, the daytime atmospheric measurement spectrum is used as a background spectrum, and participates in spectral fitting of NO3 to reduce the effect of water vapor. The mirror reflectivity and effective cavity length are calibrated, and the Allan variance analysis is also carried out. The reflectance of the mirror can reach about 0.99993 at 662 nm (NO3 absorption peak), and the corresponding theoretical effective optical path can reach more than 7 km, which can meet the measurement requirements of atmospheric NO3 radicals. The detection limit (1 sigma) of 0.75 pptv for NO3 is achieved with an acquisition time of 10 s and a total measurement error of about 16%. The atmospheric NO3 radical observation is carried out in Hefei. During the observation period, the highest NO3 concentration is 23.4 pptv, demonstrating the promising potential applications in in-situ, sensitive, accurate and fast simultaneous measurements of NO3 in the future by using the developed broadband cavity enhanced absorption spectroscopy.
资助项目	National Key R&D Program of China[2017YFC0209400] ; National Natural Science Foundation of China[41705015] ; National Natural Science Foundation of China[41905130] ; Youth Science and Technology Talents Support Program (2020) by Anhui Association for Science and Technology[RCTJ202002] ; Foundation of Director of Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, China[AGHH201601]
WOS关键词	IN-SITU MEASUREMENT ; NITROGEN-DIOXIDE ; SPECTROMETER ; N2O5 ; INSTRUMENT ; GLYOXAL ; RING ; TEMPERATURE ; DEPENDENCE ; HONO
WOS研究方向	Physics
语种	英语
出版者	CHINESE PHYSICAL SOC
WOS记录号	WOS:000607836900007
资助机构	National Key R&D Program of China ; National Natural Science Foundation of China ; Youth Science and Technology Talents Support Program (2020) by Anhui Association for Science and Technology ; Foundation of Director of Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, China
内容类型	期刊论文
源URL	[http://ir.hfcas.ac.cn:8080/handle/334002/119787]
专题	中国科学院合肥物质科学研究院
通讯作者	Qin Min
作者单位	1.Anhui Univ Technol, Sch Math & Phys, Maanshan 243002, Peoples R China 2.Chinese Acad Sci, Anhui Inst Opt & Fine Mech, HFIPS, Key Lab Environm Opt & Technol, Hefei 230031, Peoples R China 3.Anhui Med Univ, Sch Basic Med Sci, Hefei 230032, Peoples R China 4.Univ Sci & Technol China, Sch Environm Sci & Optoelect Technol, Hefei 230026, Peoples R China 5.Chinese Acad Sci, Ctr Excellence Reg Atmospher Environm, Xiamen 361021, Peoples R China
推荐引用方式 GB/T 7714	Duan Jun,Tang Ke,Qin Min,et al. Broadband cavity enhanced absorption spectroscopy for measuring atmospheric NO3 radical[J]. ACTA PHYSICA SINICA,2021,70.
APA	Duan Jun.,Tang Ke.,Qin Min.,Wang Dan.,Wang Mu-Di.,...&Liu Wen-Qing.(2021).Broadband cavity enhanced absorption spectroscopy for measuring atmospheric NO3 radical.ACTA PHYSICA SINICA,70.
MLA	Duan Jun,et al."Broadband cavity enhanced absorption spectroscopy for measuring atmospheric NO3 radical".ACTA PHYSICA SINICA 70(2021).