Field Measurement of NO2 and RNO2 by Two-Channel Thermal Dissociation Cavity Ring Down Spectrometer  

双腔热解光腔衰荡光谱仪测量大气中NO2和RNO2

作　　者：陈剑[1,2] 吴昊 刘安雯[1] 胡水明[1] 张劲松[1,2] 

机构地区：[1]中国科学技术大学,合肥微尺度国家实验室(筹),合肥230026 [2]加州大学河滨分校化学系及空气污染研究中心,加州92521

出　　处：《Chinese Journal of Chemical Physics》2017年第5期493-498,I0001,共7页化学物理学报（英文）

摘　　要：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.

关 键 词：Cavity ring-down spectroscopy Molybdenum converted chemiluminescence Thermal dissociation Organic nitrates 

分 类 号：O[理学]