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Observation of the nighttime nitrate radical in Hefei, China

Journal of Environmental Sciences 2008年第1期20卷 45-49页

作者： LI Suwen LIU Wenqing XIE Pinua LI Ang QIN Min PENG Fumin ZHU Yanwu Key Laboratory of Environmental Optical and Technology Anhui Institute of Optics and Fine MechanicsChinese Academy of Sciences Hefei 230031 China

Observation of nighttime nitrate radical （NO3） was performed by using long path differential optical absorption spectroscopy （LP- DOAS）, on the outskirts of Hefei, China. The time series of NO3 and supporting parameters were simultaneously measured for a week （31 May-7 June 2006）. The results indicated that the average concentration of NO3 was 15.6 pptv with an average lifetimes of 96 s, whereas, NO3 production rates varied from 8×10^2/（cm^3·s） to 2.98×10^7/（cm^3·s）. Furthermore, the calculated N2O5 concentration averaged at 380 pptv. Analysis of data indicated that direct sinks were probably dominating the NO3 loss process during this campaign. The results were compared with other campaigns in the boundary layer.

关键词： nitrate radical nighttime chemistry differential optical absorption spectroscopy sinks

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Measurements of Nighttime nitrate radical Concentrations in the Atmosphere by Long-Path Differential Optical Absorption Spectroscopy

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Advances in Atmospheric Sciences 2007年第5期24卷 875-880页

作者：李素文刘文清谢品华李昂秦敏窦科 Key Laboratory of Environmental Optical & Technology Anhui Institute of Optics & Fine Mechanics Chinese Academy of SciencesHefei 230031

The long-path differential optical absorption spectroscopy （LP-DOAS） technique was developed to mea- sure nighttime atmospheric nitrate radical （NO3） concentrations. An optimized retrieval method, resulting in a small residual structure and low detection limits, was developed to retrieve NO3. The time series of the NO3 concentration were collected from 17 to 24 March, 2006, where a nighttime average value of 15.8 ppt was observed. The interfering factors and errors are also discussed. These results indicate that the DOAS technique provides an essential tool for the quantification of NO3 concentration and in the study of its effects upon nighttime chemistry.

关键词： nitrate radical long-path differential optical absorption spectroscopy detection limits errors

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Research Progress on Photocatalytic Reduction of the nitrate radical

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Meteorological and Environmental Research 2013年第1期4卷 46-50页

作者： Yingchun Miao Guang Chen Gang Wang Yaling Gao Shipeng Wu Faculty of Chemistry and Chemical Engineering Qujing Normal University

Due to a large number of application of the nitrogen fertilizer, unreasonable treatments of the animal wastes, domestic sewage and industrial sewage including nitrogen, and garbage stacking in recent years, the concentration of NO; that was toxic to humans in worldwide ground water presented rise trend at different degrees. Photocatalytic removal technology of the nitrogen had many advantages and was widely valued. Cost was low, and there was no secondary pollution. Reaction condition was mild, and reaction time was short. The photocatalytic reduction re. search of nitrate at home and abroad was reviewed in detail, including photocatalyst, scavenger and reaction mechanism. In particular, perspectives for photocatalytic reduction of the nitrate were detailedly analyzed.

关键词： nitrate radical Photocatalysis Reduction China

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Reaction Kinetics and Secondary Organic Aerosol Composition Analysis of 2-Cyclohexen-1-one with NO3 radicals

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Chemical Research in Chinese Universities 2024年第4期40卷 730-736页

作者： HU Lin TONG Shengrui XU Yanyong ZHANG Hailiang YU Shanshan CHEN Meifang GE Maofa Structural Chemistry of Unstable and Stable Species Chinese Academy of Sciences Research/Education Center for Excellence in Molecular SciencesInstitute of ChemistryChinese Academy of SciencesBeijing100190P.R.China College of Ecology and Environment Xinjiang UniversityUrumqi830017P.R.China University of Chinese Academy of Sciences Beijing100049P.R.China

Unsaturated ketones are typical oxygenated volatile organic compounds(OVOCs)with high reactivity,and are important precursors in air *** sources of OVOCs are complex and include direct emissions and secondary oxidation formation of VOCs in the atmosphere.2-Cyclohexen-1-one is a widespread substance,and is derived from the industrial catalytic oxidation of *** this paper,we investigated the rate constants of the chemical reactions of 2-cyclohexen-1-one with NO3 radicals,which is(7.25±0.29)×10^(-15) cm^(3)·molecule^(-1)·s^(-1) at 298 K and under 1 atm(1 atm=101325Pa).It supplemented the kinetics of NO3 radicals database,and revealed its effects in the nighttime *** addition,the reaction products of 2-cyclohexen-1-one with NO3 radicals were detected by Fourier transform ion cyclotron resonance mass spectrometry(FT-ICR MS),which revealed a series of nitrate esters in the composition of the secondary organic aerosol(SOA),which may reduce atmospheric ***,the possible pathways for the generation of the products were developed.

关键词： Kinetics Unsaturated ketone nitrate radical Secondary organic aerosol

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Cavity Ring-Down Spectroscopy Measurements of Ambient NO3 and N2O5

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Chinese Journal of Chemical Physics 2020年第1期33卷 1-7页

作者： Hao Wu Jian Chen An-wen Liu Shui-ming Hu Jing-song Zhang Hefei National Laboratory for Physical Sciences at the Microscale University of Science and Technology of ChinaHefei 230026China Department of Chemical Physics School of Chemistry and Materials ScienceUniversity of Science and Technology of ChinaHefei 230026China Department of Chemistry and Air Pollution Research Center University of CaliforniaRiverside California 92521USA

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 *** effective absorption length ratio and the total loss coefficient of the instrument were calibrated using laboratory standard *** 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 *** instrument was used to monitor the concentrations of NO3 and N2O5 in the atmosphere of winter in Hefei in real *** 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

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