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Field measurement of NO2 and RNO2 by two-channel thermal dissociation cavity ring down spectrometer
胡水明
作者单位E-mail
胡水明 中国科学技术大学 smhu@ustc.edu.cn 
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 sec. 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 is low but RNO2 is high.
关键词:  Cavity ring-down spectroscopy, molybdenum converted chemiluminescence, thermal dissociation, organic nitrates.
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Field measurement of NO2 and RNO2 by two-channel thermal dissociation cavity ring down spectrometer
胡水明
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 sec. 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 is low but RNO2 is high.
Key words:  Cavity ring-down spectroscopy, molybdenum converted chemiluminescence, thermal dissociation, organic nitrates.