Device and method for measuring OH and HO2 free radicals in atmosphere by chemical ionization mass spectrometry
A technology of mass spectrometry and chemical ionization, applied in color/spectral characteristic measurement, fluorescence/phosphorescence, material excitation analysis, etc., can solve problems such as low concentration, real-time, online measurement and difficult atmospheric monitoring
Inactive Publication Date: 2019-06-14
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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However, since the survival time of free radicals is less than 1s, and the concentration is extremely low, for OH, HO 2 The real-time and online measurement of free radicals has always been a difficult point in the field of atmospheric monitoring
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Embodiment 1
[0110] Measure atmospheric OH and HO for chemical ionization mass spectrometry described in the present invention 2 The performance of free radical devices and methods is investigated. On April 30, 2017, the daytime concentration trend of atmospheric OH free radicals was continuously monitored on the roof of the fifth floor of the Biotechnology Building, No. 457, Zhongshan Road, Shahekou District, Dalian City. The results are as follows: Figure 4 As shown, it shows that the concentration of atmospheric OH radicals gradually rises from 05:00 to 12:00 and reaches a peak value, and then gradually decays with the weakening of sunlight at 12:00 to 18:00, and the resulting change The law is consistent with literature reports (Atmospheric Environment 154(2017) 167-178; Journal of Environmental Sciences 20(2008) 28-32).
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Abstract
The invention discloses a method for carrying out online measurement on OH and HO2 free radicals in the atmosphere, particularly relates to implementation of real-time online analysis on the OH and HO2 free radicals in the atmosphere on the basis of high-sensitivity chemical ionization time-of-flight mass spectrometry. A device comprises a free radical sampling device, a chemical ionization sourceand a time-of-flight mass spectrometer; the free radical sampling device implements sampling of the OH and HO2 free radicals; and the chemical ionization source and the time-of-flight mass spectrometer implement measurement of the OH and HO2 free radicals. The main measurement principle is that: by titrating a proper amount of SO2, the OH and HO2 free radicals are all transformed into H2SO4; H2SO4 is ionized into HSO4- ions by NO3- through a chemical ionization method; and finally, by utilizing strength of NO3- and HSO4- ions, which is obtained by measurement, calculation and analysis on real-time concentration of the OH and HO2 free radicals are completed. The instrument and method utilized by the invention have the advantages of high sensitivity, high stability, quick response and the like, meet analysis requirements of free radicals in the atmosphere for real time performance, online performance, dynamic changes and the like, and have wide application prospect in the fields of environmental monitoring and the like.
Description
technical field [0001] The invention relates to the field of atmospheric monitoring, in particular to the field of atmospheric free radical measurement, in particular to a method based on high-sensitivity chemical ionization time-of-flight mass spectrometry technology to realize atmospheric OH and HO 2 Device and method for real-time and online analysis of free radicals. Background technique [0002] With the advancement of industrial processes and the extensive use of fossil fuels, the atmospheric environment has been increasingly affected. where OH and HO 2 Free radicals are the most active oxidants and catalysts in atmospheric chemistry, and can chemically react with most components in the atmosphere. However, since the survival time of free radicals is less than 1s, and the concentration is extremely low, for OH, HO 2 The real-time and online measurement of free radicals has always been a difficult point in the field of atmospheric monitoring. [0003] Currently used...
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IPC IPC(8): G01N21/64G01N21/31
Inventor 李海洋李庆运花磊何梦琦陈璇
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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