Chen Mu-Lan, Wang Sai-Nan, Chen Tian-Shu, Zhu Bo, Peng Chao, Zhou Jia-Wei, Che Han-Xiong, Huang Rui-Hui, Yang Fu-Mo, Liu He-Fan, Tan Qin-Wen, Han Li, Chen Jun-Hui, Lu Ke-Ding, Chen Yang
Research Center for Atmospheric Environment, Chongqing Institute of Green and Intelligent Technology, Chinese Academy of Sciences, Chongqing 400714, China.
College of Resources and Environment, Chongqing School, University of Chinese Academy of Sciences(UCAS Chongqing), Chongqing 400714, China.
Huan Jing Ke Xue. 2021 Jun 8;42(6):2648-2658. doi: 10.13227/j.hjkx.202010101.
Oxygenated volatile organic compounds (OVOCs) are important intermediates in the troposphere and the most important sources of ozone. Proton-transfer-reaction time-of-flight mass spectrometry (PTR-TOF-MS) was used to measure VOCs in the Chengdu Plain, Southwestern China. The diurnal variations, photochemical reactivity, O formation potential, and sources were also investigated. The mixing ratios of ten kinds of VOCs (acetaldehyde, acetone, isoprene, Methyl ethyl ketone, Methyl vinyl ketone and Methacrolein, benzene, toluene, styrene, C8 aromatics, and C9 aromatics) were (10.97±4.69)×10. The concentrations of OVOCs, aromatic hydrocarbons, and biogenic VOCs were (8.54±3.44)×10, (1.53±0.93)×10, and (0.90±0.32)×10, respectively. Isoprene, acetaldehyde, and m-xylene were the top three photochemically active species with the greatest O formation potentials. The dominant three OVOCs species (acetaldehyde, acetone, and MEK) were mainly derived from local biogenic sources and anthropogenic secondary sources, and acetone had a strong regional background level, indicating that pollution in this area is significantly affected by regional transmission. This study deepens the understanding of regional O formation mechanisms in southwest China and provides a basis for the scientifically informed control of O pollution.
含氧挥发性有机化合物（OVOCs）是对流层中的重要中间体，也是臭氧的最重要来源。采用质子转移反应飞行时间质谱（PTR-TOF-MS）对中国西南部成都平原的挥发性有机化合物（VOCs）进行了测量。还研究了其日变化、光化学反应活性、臭氧生成潜力和来源。十种挥发性有机化合物（乙醛、丙酮、异戊二烯、甲乙酮、甲基乙烯基酮和甲基丙烯醛、苯、甲苯、苯乙烯、C8芳烃和C9芳烃）的混合比为（10.97±4.69）×10。OVOCs、芳烃和生物源挥发性有机化合物的浓度分别为（8.54±3.44）×10、（1.53±0.93）×10和（0.90±0.32）×10。异戊二烯、乙醛和间二甲苯是臭氧生成潜力最大的三种光化学活性物质。三种主要的OVOCs物质（乙醛、丙酮和甲乙酮）主要来自本地生物源和人为二次源，丙酮具有较强的区域背景水平，表明该地区的污染受区域传输影响显著。本研究加深了对中国西南地区臭氧生成机制的理解，为科学控制臭氧污染提供了依据。
