| In recent years,the environmental pollution problems in China have become more and more serious.Because of the complexity and diversity of PM2.5 sources,and the different environmental conditions in different regions,the traditional PM2.5 monitoring methods have difficulties in determining the source of pollutants due to its limitations.Since different sources of atmospheric PM2.5 have different response characteristics in the terahertz band,it is of great significance to study the composition and concentration of PM2.5 using terahertz technology.In this paper,Fourier infrared spectrometer is used to analysis the absorption spectrum in the terahertz band?3-10 THz?of the samples collected from Changping district of Beijing and Shanxi Pacific atmosphere,a coal-fired power plant in Hebei,the chimney port of one school's cafeteria in Changping district of Beijing,as well as the decoration of the indoor environment.The results show that samples from different sources have different absorption characteristics and main absorption bands,and the absorbance of the sample has a positive correlation to the sample mass.The absorbance-mass curves of different samples have different slopes.The terahertz band absorption spectrum of the sample was processed by synchronously and asynchronously two-dimensional correlation spectroscopy?2DCOS?.The analysis showed that the sample has different absorption peaks of anion and cation in the terahertz band.SEM-EDS analysis techniques can make the structure characteristics of PM2.5 more clear and quantitatively analyze the composition of PM2.5.The results show that terahertz spectroscopy can provide an effective basis of rapid identification of PM2.5 pollution sources.The principle and method of discrimination is simple,rapid,and direct. |
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