1. Key Laboratory of Optics and Technology, Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei 230031, China
2. University of Science and Technology of China, Hefei 230026, China
3. Key Laboratory of Optical Monitoring Technology for Environment of Anhui Province, Hefei 230031, China
Abstract：Polycyclic aromatic hydrocarbons (PAHs) are a group of persistent organic pollutants (POPs) which are mutagenic, carcinogenic and teratogenic. They are widely distributed in air, water and soil. Once PAHs enter the soil, they remain in the soil for a long time. PAHs are concentrated in the soil. They can enter the human body in many ways and pose a threat to human health. Therefore, it is necessary to monitor PAHs in soil. Now, traditional detection methods are cumbersome and time-consuming, which is not conducive to the widely rapid detection of PAHs in the contaminated sites. The method based on laser-induced fluorescence spectroscopy can quickly identify and detect organic pollutants in the soil. However, PAHs are volatile and can be degraded by ultraviolet light, so the selection of UV laser energy is very important. In this work,a 266nm laser-induced fluorescence system is established in the laboratory. Anthracene, pyrene, and phenanthrene are used to investigate the decomposition and fluorescence spectra of PAHs under different laser energies. The results showed that when the energy density of the laser changed, the peak positions of the fluorescence center did not shift, but the relative standard deviations of the maximum intensity at the fluorescence peaks of three PAHs decreased firstly and increased then. When the energy density was 8.54 mJ·cm-2, the relative standard deviations of the three PAHs in 10 spectral measurements were the largest, and the relative standard deviations of the fluorescence peak intensities of anthracene, pyrene and phenanthrene reach the minimum value at 1.72，1.00 and 1.47 mJ·cm-2. The decomposition rates were 59.3%, 69.8% and 63.6% for anthracene, pyrene and phenanthrene at 100 s, respectively. At higher energies, three PAHs decompose rapidly. Compared with the other two PAHs, pyrene was more prone to photodegradation and thermal decomposition, and the relative standard deviation of fluorescence peak intensity was also higher than that of anthracene and phenanthrene. For anthracene, when the laser energy density was 1.72 mJ·cm-2, the decomposition rate was close to 0 at 10 s and 12.8% at 100 s, and the relative standard deviation of the fluorescence peak intensity was the lowest. When the laser energy density was reduced to 0.88 mJ·cm-2, the decomposition of anthracene in 100s was almost negligible. For pyrene, when the laser energy density dropped below 1.00 mJ·cm-2, the decomposition tended to be consistent, and the decomposition rate was 47.3%～47.4% at 100 s. For phenanthrene, when the energy density of the laser was lower than 1.47 mJ·cm-2, the decomposition rates no longer decreased, and the decomposition rates were 36.8%～38.6%. Pyrene and phenanthrene still decompose in low energy density.
Key words：Laser-induced fluorescence; Soil; Polycyclic aromatic hydrocarbons; Energy density
基金资助: National Natural Science Foundation of China(61705238), Anhui Science and Technology Major Projects (16030801117), The National Key Research and Development Program of China (2016YFD0800902-2), Foundation of Director of AIOFM(AGHH201602)
通讯作者:
赵南京
E-mail: njzhao@aiofm.ac.cn
作者简介: HUANG Yao, (1991—), postgraduate in Key Laboratory of Environmental Optics ＆ Technology, Anhui Institute of Optics and Fine Mechanics of CAS e-mail:
yhuang@aiofm.ac.cn
引用本文:
黄 尧，赵南京，孟德硕，左兆陆，陈宇男，陈晓伟，殷高方. 紫外脉冲激光作用下土壤中多环芳烃的分解与荧光发射特性[J]. 光谱学与光谱分析, 2020, 40(07): 2319-2324.
HUANG Yao, ZHAO Nan-jing, MENG De-shuo, ZUO Zhao-lu, CHEN Yu-nan, CHEN Xiao-wei, YIN Gao-fang. Study on Characteristics of Decomposition and Fluorescence Emission of PAHs in Soil by Pulsed Ultraviolet Laser. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2020, 40(07): 2319-2324.
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