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Effect of Atmospheric Interfering Absorption on Measurement of BTX by DOAS
Fu-min Peng1,2, Pin-hua Xie¤1, Jun-de Wang3, Hai-yang Li3, Ying-hua Zhang1, Fu-qi Si1, Wen-qing Liu1
1.Key Laboratory of Environmental Optical and Technology, Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei 230031, China;2.College of Chemistry and Chemical Engineering, Anhui University, Hefei 230039, China Dalian Institute o;3.Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China
Abstract:
It was reported on the elimination of interfering absorption of BTX. the absorption of O2 includes different absorption bands, which change differently when the partial pressure of oxygen is varied. These cause the nonlinear absorption of O2 and the observed band shape to vary with the column density of O2. The absorption ratios of molecular absorption in each of the Herzberg bands and dimer absorptions, as well as the contribution to the correction error of molecular absorption, are studied based on the characteristic of these absorption bands. The optimized way to eliminate the interfering absorption is obtained in the end and the effectiveness of using interpolation proposed by Volkamer et al. to remove O2 absorption is proved again. As to O3 and SO2, the effect of the thermal effect of characteristic spectra on the elimination error of their absorption is studied. Solutions to these problems are discussed and demonstrated together with methods to optimize the interpolation of spectra. As a sample application, differential optical absorption spectroscopy (DOAS) measurements of BTX are carried out. Results show a low detection limit and the good correlation with point instruments are achieved. All these prove the feasibility of using spectral interpolation to improve the accuracy of DOAS measurements of aromatic hydrocarbons for practical purposes.
Key words:  Differential optical absorption spectroscopy, BTX, Herzberg band, O2 dimer
FundProject:国家高技术研究发展计划
Effect of Atmospheric Interfering Absorption on Measurement of BTX by DOAS
彭夫敏,谢品华¤,王俊德,李海洋,张英华,司福祺,刘文清
1.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,合肥230031;2.中国科学院大连化学物理研究所,大连116023
摘要:
利用差分吸收光谱技术(DOAS)研究了去除BTX(大气中芳香烃污染物的主要成分)测量中O2、O3和SO2的干扰吸收. 针对O2的非线性吸收以及特征吸收结构随柱浓度的不同而变化的特点,研究了O2吸收组成成份-各个吸收带的非同步变化,即三个Herzberg吸收带与O2二聚体吸收带间的非同步变化,以及三个Herzberg吸收带之间,O2-O2和O2-N2两种二聚体吸收带之间也存在的非同步变化;结合各个吸收带的来源与特点研究了各个吸收带在O2吸收中的比重,以及对O2吸收在大气谱中校准误差的影响,最后得出最佳去除方法并证明了光程插值去除O2吸收的可能性. 针对大气中含量较高的O3与SO2的吸收,主要研究了吸收谱主要的影响因素-温度效应对于O3和SO2吸收结构去除误差的影响,讨论了用插值方法去除O3吸收结构时应选择的最佳温度条件. 最后,通过对实际大气进行了实际监测,获得了与点式仪器GC的检测结果的较好相关性,并得到了较低的BTX的检测限,验证了该方法的可行性.
关键词:  差分吸收光谱,BTX,Herzberg吸收带,O2二聚体
DOI:10.1088/1674-0068/21/03/202-210
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