Characterizing PM<sub>2.5</sub> in Beijing and Shanxi Province using terahertz radiation

doi:10.1007/s12200-016-0608-1

Front. Optoelectron.

2016, Vol. 9

Issue (4) : 544-548 https://doi.org/10.1007/s12200-016-0608-1

RESEARCH ARTICLE

Characterizing PM_2.5 in Beijing and Shanxi Province using terahertz radiation

Ning LI¹,Honglei ZHAN¹(

),Kun ZHAO¹(

),Zhenwei ZHANG²,Chenyu LI²,Cunlin ZHANG²

¹. Beijing Key Laboratory of Optical Detection Technology for Oil and Gas, China University of Petroleum, Beijing 102249, China
². Department of Physics, Capital Normal University, Beijing 100048, China

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Abstract

Particles of aerodynamic diameter≤2.5 μm (PM_2.5) caused extremely severe and persistent haze pollution is of concern in many cities. In this study, samples of PM_2.5 were collected from atmosphere environment of Beijing and Shanxi Province, and analyzed using terahertz (THz) radiation. The transmission spectrum of PM_2.5 in Shanxi Province had two distinct absorption peaks at 6.0 and 6.7 THz, and the curve was increasing on the whole. However, the transmission spectrum of PM_2.5 in Beijing had obviously different variation tendency and the absorption peak was studied by monitoring PM_2.5 masses in conjunction with two-dimensional correlation spectroscopy (2DCOS). By comparing the pollutant species and concentrations of Shanxi Province and Beijing over the time of collecting samples, the concentrations of sulfate and ammonium were similar, which contributed to emerge absorption bands in the same position. While the concentrations of organic matter (OM), nitrate, chloride and elemental carbon (EC) were different. Furthermore, dust and some other inorganic ion are unique to Shanxi province, which lead to different variation tendency of the transmission spectrum of PM_2.5. These results will be of importance for environmental monitoring and for controlling PM emissions. According to this research, optical techniques, and especially spectral methods, should be considered for PM_2.5 monitoring.

Keywords PM_2.5 terahertz two dimensional correlation spectroscopy (2DCOS)

Corresponding Author(s): Honglei ZHAN,Kun ZHAO

Just Accepted Date: 14 September 2016 Online First Date: 17 October 2016 Issue Date: 29 November 2016

Cite this article:

Ning LI,Honglei ZHAN,Kun ZHAO, et al. Characterizing PM_2.5 in Beijing and Shanxi Province using terahertz radiation[J]. Front. Optoelectron., 2016, 9(4): 544-548.

URL:

https://academic.hep.com.cn/foe/EN/10.1007/s12200-016-0608-1
https://academic.hep.com.cn/foe/EN/Y2016/V9/I4/544

Fig.1 Frequency-dependent spectra of PM_2.5 from Beijing as well as Shanxi and reference (blank filters)

Fig.2 Frequency dependence of the absorbance spectra of the PM_2.5 samples collected in the atmospheric environment from Beijing and Shanxi, respectively. The mass of PM_2.5 collected from Beijing ranged from 0.4 to 2.5 mg. And the mass of PM_2.5 collected from Shanxi ranged from 0.6 to 1.0 mg

Fig.3 Synchronous 2-D correlation plot over the frequency range from 4.0 to 7.5 THz. The numbers represent the coordinates of the peaks in synchronous data. Positive correlation is indicated that the absorption increased with PM_2.5 mass over the entire frequency (4.0–7.5 THz)

Fig.4 Asynchronous 2-D correlation plot over the frequency range from 4.0 to 7.5 THz. The numbers represent the horizontal ordinates of the peaks in asynchronous data. Cross peaks develop only if the intensity varies out of phase with each other for some Fourier frequency components of signal fluctuations

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