Cavity Ring-Down Spectroscopy Measurements of Ambient NO3 and N2O5  

作　　者：Hao Wu Jian Chen An-wen Liu Shui-ming Hu Jing-song Zhang 

机构地区：[1]Hefei National Laboratory for Physical Sciences at the Microscale,University of Science and Technology of China,Hefei 230026,China [2]Department of Chemical Physics,School of Chemistry and Materials Science,University of Science and Technology of China,Hefei 230026,China [3]Department of Chemistry and Air Pollution Research Center,University of California,Riverside California 92521,USA

出　　处：《Chinese Journal of Chemical Physics》2020年第1期1-7,共7页化学物理学报（英文）

基　　金：Hao Wu,Jian Chen,An-wen Liu,and Shui-ming Hu acknowledge the supports from the Ministry of Science and Technology of China(No.2013BAK12B00);the National Natural Science Foundation of China(No.21427804).

摘　　要：NO3 and N2O5 are important participants in nocturnal atmospheric chemical processes,and their concentrations are of great significance in the study of the mechanism of nocturnal atmospheric chemical reactions.A two-channel diode laser based cavity ring-down spectroscopy(CRDS)instrument was developed to monitor the concentrations of NO3 and N2O5 in the atmosphere.The effective absorption length ratio and the total loss coefficient of the instrument were calibrated using laboratory standard samples.The effective absorption cross section of NO3 at 662 nm was derived.A detection sensitivity of 1.1 pptv NO3 in air was obtained at a time resolution of 1 s.N2O5 was converted to NO3 and detected online in the second CRDS channel.The instrument was used to monitor the concentrations of NO3 and N2O5 in the atmosphere of winter in Hefei in real time.By comparing the concentration changes of pollutants such as nitrogen oxides,ozone,PM2:5 in a rapid air cleaning process,the factors affecting the concentrations of NO3 and N2O5 in the atmosphere were discussed.

关 键 词：Cavity ring-down spectroscopy Nitrate radical Dinitrogen pentoxide Field measurement 

分 类 号：O657.3[理学—分析化学] P402[理学—化学]