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Intercomparison of IBBCEAS, NitroMAC and FTIR for HONO, NO2 and HCHO measurements during the reaction of NO2 with H2O vapor in the atmospheric simulation chamber of CESAM
Atmospheric Measurement Techniques ( IF 3.8 ) Pub Date : 2021-02-16 , DOI: 10.5194/amt-2021-19
Hongming Yi , Mathieu Cazaunau , Aline Gratien , Vincent Michoud , Edouard Pangui , Jean-Francois Doussin , Weidong Chen

Abstract. We report on applications of ultraviolet light emitted diode based incoherent broadband cavity enhanced absorption spectroscopy (UV-LED-IBBCEAS) technique for optical monitoring of HONO, NO2 and CH2O in a simulation chamber. Performance intercomparison of the UV-LED-IBBCEAS with a wet chemistry-based NitroMAC sensor and a FTIR spectrometer has been carried out on real time simultaneous measurement of HONO, NO2 and CH2O concentrations during the reaction of NO2 with H2O vapor in the CESAM atmospheric simulation chamber. 1-σ (SNR = 1) detection limits of 200 pptv for NO2, 100 pptv for HONO and 5 ppbv for CH2O over 120 s were found for the UV-LED-IBBCEAS measurement. On the contrary to many set-ups where cavities are installed outside the simulation chamber, we describe here an original in-situ permanent installation. The intercomparison results demonstrate that IBBCEAS is a very well suitable technique for in situ simultaneous measurements of multiple chemically reactive species with high sensitivity and high precision even if the absorption bands of these species are overlapped. It offers excellent capacity to non-invasive optical monitoring of chemical reaction without any perturbation. For the application to simulation chamber, it has the advantage to provide a spatially integrated measurement across the reactor and hence to avoid point sampling related artefact.

中文翻译:

在CESAM大气模拟室内NO 2与H 2 O蒸气反应过程中IBBCEAS,NitroMAC和FTIR在HONO,NO 2和HCHO测量中的比对

摘要。我们报告了基于紫外发光二极管的非相干宽带腔增强吸收光谱(UV-LED-IBBCEAS)技术在模拟室中光学监测HONO,NO 2和CH 2 O的应用。在实时同时测量NO 2与H 2 O反应过程中HONO,NO 2和CH 2 O浓度的同时,还进行了UV-LED-IBBCEAS与基于湿化学的NitroMAC传感器和FTIR光谱仪的性能对比。CESAM大气模拟室内的蒸汽。1-σ(SNR = 1)NO 2的检测限为200 pptv,HONO为100 pptv,CH 2为5 ppbvUV-LED-IBBCEAS测量发现超过120秒。与将腔体安装在模拟腔室外的许多设置相反,我们在此描述原始的现场永久性安装。相互比较的结果表明,IBBCEAS是一种非常合适的技术,即使它们的吸收谱带重叠,也可以高灵敏度和高精度地同时测量多种化学反应物种。它为化学反应的非侵入性光学监控提供了出色的功能,而不会产生任何干扰。对于应用于模拟室,其优点是在整个反应堆上提供空间集成的测量,从而避免了与点采样有关的伪像。
更新日期:2021-02-16
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