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差分吸收光谱方法反演大气环境单环芳香烃有机物
引用本文:谢品华,付强,刘建国,刘文清,秦敏,李昂,刘世胜,魏庆农.差分吸收光谱方法反演大气环境单环芳香烃有机物[J].光谱学与光谱分析,2006,26(9):1584-1588.
作者姓名:谢品华  付强  刘建国  刘文清  秦敏  李昂  刘世胜  魏庆农
作者单位:中国科学院环境光学与技术重点实验室,中国科学院安徽光学精密机械研究所,安徽,合肥,230031;中国环境监测总站,北京,100029
基金项目:中国科学院知识创新工程项目 , 国家高技术研究发展计划(863计划) , 中国科学院所长基金
摘    要:差分吸收光谱技术(differential optical absorption spectroscopy, DOAS)是利用气体分子在紫外-可见光谱范围的特征吸收来测量其浓度含量,如SO2,NO2,O3等。由于大气环境中的芳香烃有机物含量较低,并且其在紫外的特征吸收光谱与O2和O3分子的吸收谱相互重叠,交叉干扰,使得对芳香烃有机物的测量比较困难。文章利用自制的差分吸收光谱系统,采用与实际测量光程接近、经过插值的氧气分子吸收柱密度作为氧气分子吸收的参考光谱,通过最小二乘拟合去除其干扰,另外采用不同温度下的O3吸收截面作为参考光谱修正O3的温度效应,测量了大气环境中的苯、甲苯、二甲苯和苯酚,表明差分吸收光谱方法能满足大气环境中单环芳香烃的测量。

关 键 词:差分吸收光谱(DOAS)  单环芳香烃  大气环境
文章编号:1000-0593(2006)09-1584-05
收稿时间:2005-05-14
修稿时间:2005-09-29

Retrieval of Monocyclic Aromatic Hydrocarbons with Differential Optical Absorption Spectroscopy
XIE Pin-hua,FU Qiang,LIU Jian-guo,LIU Wen-qing,QIN Min,LI Ang,LIU Shi-sheng,WEI Qing-nong.Retrieval of Monocyclic Aromatic Hydrocarbons with Differential Optical Absorption Spectroscopy[J].Spectroscopy and Spectral Analysis,2006,26(9):1584-1588.
Authors:XIE Pin-hua  FU Qiang  LIU Jian-guo  LIU Wen-qing  QIN Min  LI Ang  LIU Shi-sheng  WEI Qing-nong
Institution:1. Key Lab of Environmental Optics and Technology, Chinese Academy of Sciences, and Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei 230031, China2. China National Environmental Monitoring Center, Beijing 100029, China
Abstract:Differential optical absorption spectroscopy (DOAS) technique has been used to measure trace gases in the atmosphere by their strongly structured absorption of radiation in the UV and visible spectral range, e.g. SO_2, NO_2, O_3 etc. However, unlike the absorption spectra of SO_2 and NO_2, the analysis of aromatic compounds is difficult and strongly suffers from the cross interference of other absorbers (Herzberg bands of oxygen, ozone and sulfur dioxide), especially with relatively low concentrations of aromatic compounds in the atmosphere. In the present paper, the DOAS evaluation of aromatic compounds was performed by nonlinear least square fit with two interpolated oxygen optical density spectra at different path lengths and reference spectra of ozone at different temperature and SO_2 cross section to correct the interference from absorbers of O_2, O_3 and SO_2. The measurement of toluene, benzene, (m,p,o)xylene and phenol with a DOAS system showed that DOAS method is suitable for monocyclic aromatic compounds monitoring in the atmosphere.
Keywords:Differential optical absorption spectroscopy (DOAS)  Monocyclic aromatic hydrocarbon  Atmospheric environment
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