Study on the factors affecting the formation of nitrogen-containing organic compounds formed from ammonia and toluene secondary organic aerosol
XU Jun1, HUANG Ming-qiang1, FENG Zhuang-zhuang1, CAI Shun-you1, ZHAO Wei-xiong2, HU Chang-jin2, GU Xue-jun2, ZHANG Wei-jun2
1. College of Chemistry & Chemical Engineering and Environment, Minnan Normal University, Fujian Provincial Key Laboratory of Modern Analytical Science and Separation Technology, Zhangzhou 363000, China;
2. Laboratory of Atmospheric Physico-Chemistry, Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei 230031, China
Ozone was photolyzed to produce OH radicals, and photooxidation of toluene is initiated to generate secondary organic aerosol (SOA) particles in home-made smog chamber, nitrogen-containing organic compounds formed from toluene SOA reaction with ammonia were studied under different experimental conditions. The absorbance at 205 and 270nm of the reaction product solution measured by UV-visible spectrophotometer was used to study the influence of environmental factors such as irradiation time, the concentration of toluene, ammonia, ozone, and relative humidity on the formation of nitrogen-containing organic compounds. The experimental results demonstrated that the concentration of organic acid ammonium and imidazole products gradually increases with the increase of ultraviolet irradiation time and the concentrations of toluene, ammonia and ozone. However, when the concentration of ozone exceeds a certain value, the high concentration of OH radicals generated by photolysis of ozone can oxidize the photooxidation product of toluene into more volatile compounds, which is not conducive to the formation of nitrogen-containing organic compounds. Also, the increase of water molecules would reduce the concentration of OH radicals, resulting in the decrease of the concentration of organic acid ammonium and imidazole products as the relative humidity increases. These would provide the experimental basis for studying the formation of the nitrogen-containing organic brown carbon of anthropogenic SOA particles.
徐俊, 黄明强, 冯状状, 蔡顺有, 赵卫雄, 胡长进, 顾学军, 张为俊. 氨与甲苯SOA形成含氮有机物的影响因素研究[J]. 中国环境科学, 2019, 39(2): 533-541.
XU Jun, HUANG Ming-qiang, FENG Zhuang-zhuang, CAI Shun-you, ZHAO Wei-xiong, HU Chang-jin, GU Xue-jun, ZHANG Wei-jun. Study on the factors affecting the formation of nitrogen-containing organic compounds formed from ammonia and toluene secondary organic aerosol. CHINA ENVIRONMENTAL SCIENCECE, 2019, 39(2): 533-541.
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