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Abstract

The quantitative method of iodine monoxide radical (IO) using incoherent broadband cavity enhanced absorption spectroscopy (IBBCEAS) in the 435–465 nm band is described in this paper. In order to obtain the concentration of IO accurately, the parameters such as the mirror reflectivity, effective cavity length and sample loss of the IBBCEAS system are evaluated. Using the difference of Rayleigh scattering between nitrogen and helium, the reflectivity curve of the high-reflection mirror is obtained. The reflectivity Rof the mirror at 436.1 nm of the IO absorption peak is about 0.99982, and the effective absorption optical path reaches 3.83 km under vacuum condition. According to the absorption of O ₄, the effective cavity length of the modified system is 60.7 cm. The Allan deviation is used to evaluate the performance of the system, and the standard deviation is used to analyze the detection sensitivity of the system. When the time resolution is 60 s, the detection sensitivity (2 σ) of the system for IO and NO ₂are 1.9 pptv and 20 pptv (part per trillion by volume), respectively. The iodine dissolved in potassium iodide (KI) solution is taken out by the bubbling method and react with ozone after photolysis to produce a stable concentration of IO sample gas. The IO loss in the sampling tube is calibrated, and the results show that the sampling tube has no significant effect on the IO loss. The IBBCEAS system is used to determine the linearity of IO, and the correlation coefficient R ²between the measured concentration of IO and the proportioned concentration in a concentration range from 39 to 530 pptv is 0.99. The IO produced by the reaction of iodine released from kelp with ozone is measured.

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Corresponding author:Qin Min,mqin@aiofm.ac.cn

Funds:Project supported by the National Natural Science Foundation of China (Grant Nos. 41875154, U19A2044) and the Anhui Provincial Key R&D Program, China (Grant No. 202104i07020010)

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系统	时间分辨率	检测限(2σ)	参考文献
LP-DOAS	60 s	1.25 pptv	Commane等^[2](2011)
MAX-DOAS	60 s	1.3 × 10¹³molecule·cm^–2	Coburn等^[6](2011)
LIF	300 s	0.6 pptv	Gravestocket等^[8](2010)
CRDS	30 s	10 pptv	Wada等^[9](2007)
ML-CEAS	300 s	20 ppqv	Grilli等^[10](2012)
IBBCEAS	60 s	30 pptv	Vaughan等^[14](2008)
IBBCEAS	60 s	4.4 pptv	Ashu-Ayem等^[12](2012)
IBBCEAS	22 min	0.6 pptv	Thalman等^[13](2010)
IBBCEAS	60 s	1.9 pptv	This work

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Vol. 70, Issue 15 - 2021-08-05

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