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Field Measurement of NO2 and RNO2 by Two-Channel Thermal Dissociation Cavity Ring Down Spectrometer
Jian Chen,Hao Wu,An-wen Liu,Shui-ming Hu*,Jingsong Zhang
Author NameAffiliationE-mail
Jian Chen Hefei National Laboratory for Physical Sciences at the Microscale, University of Science and Tech-nology of China, Hefei 230026, China;Department of Chemistry and Air Pollution Research Center, University of California, Riverside, California 92521, America  
Hao Wu Hefei National Laboratory for Physical Sciences at the Microscale, University of Science and Tech-nology of China, Hefei 230026, China  
An-wen Liu Hefei National Laboratory for Physical Sciences at the Microscale, University of Science and Tech-nology of China, Hefei 230026, China  
Shui-ming Hu* Hefei National Laboratory for Physical Sciences at the Microscale, University of Science and Tech-nology of China, Hefei 230026, China smhu@ustc.edu.cn 
Jingsong Zhang Hefei National Laboratory for Physical Sciences at the Microscale, University of Science and Tech-nology of China, Hefei 230026, China;Department of Chemistry and Air Pollution Research Center, University of California, Riverside, California 92521, America  
Abstract:
A two-channel thermal dissociation cavity ring down spectroscopy (CRDS) instrument has been built for in situ, real-time measurement of NO2 and total RNO2 (peroxy nitrates and alkyl nitrates) in ambient air, with a NO2 detection limit of 0.10 ppbv at 1 s. A 6-day long measurement was conducted at urban site of Hefei by using the CRDS instrument with a time resolution of 3 s. A commercial molybdenum converted chemiluminescence (Mo-CL) instrument was also used for comparison. The average RNO2 concentration in the 6 days was measured to be 1.94 ppbv. The Mo-CL instrument overestimated the NO2 concentration by a bias of +1.69 ppbv in average, for the reason that it cannot distinguish RNO2 from NO2. The relative bias could be over 100% during the afternoon hours when NO2 was low but RNO2 was high.
Key words:  Cavity ring-down spectroscopy  Molybdenum converted chemiluminescence  Thermal dissociation  Organic nitrates
FundProject:This work was supported from the Ministry of Sci- ence and Technology of China (No.2013CB834602 and 2013BAK12B00), the National Natural Science Foun- dation of China (No.21427804 and No.21225314).
双腔热解光腔衰荡光谱仪测量大气中NO2和RNO2
陈剑,吴昊,刘安雯,胡水明*,张劲松
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DOI:10.1063/1674-0068/30/cjcp1705084
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