Xu Chen-Xi, Chen Jun-Hui, Jiang Tao, Han Li, Wang Bo, Li Ying-Jie, Wang Cheng-Hui, Liu Zheng, Qian Jun
Sichuan Academy of Environmental Sciences, Chengdu 610000, China.
Huan Jing Ke Xue. 2020 Dec 8;41(12):5316-5324. doi: 10.13227/j.hjkx.202006040.
In the research, volatile organic compounds (VOCs) were observed online in urban areas of Chengdu to study VOC concentration level, change characteristics, ozone generation contribution (OFP), and source contribution from June to September 2019. The results showed that the average concentration of TVOCs (total volatile organic compounds) was 112.66 μg·m, with alkanes (29.51%) and halogenated hydrocarbons (23.23%) forming the main components. The diurnal peak in VOCs mainly occurred from 10:00 am to 11:00 am, which is affected by urban motor vehicles, oil or gas volatilization, and industrial emissions. For OFP contribution of VOCs in summer, the contribution rate of aromatic hydrocarbons (42.7%) was the highest, followed by alkenes (27.4%). The key active species were -xylene, ethylene, propylene, -xylene, isopentane, cyclopentane, and acrolein. According to the source analysis by the PMF model, mobile sources are the main contributors of VOCs in summer in Chengdu, contributing 34% to TVOCs, followed by industrial sources (17%), volatile oil and gas (14%), and solvent use and natural sources contributing 11% and 13%. Therefore, motor vehicle and industrial emissions are the key control sources of VOCs in Chengdu, although control of pollution sources such as solvent use and oil or gas volatilization cannot be ignored.
在该研究中，于2019年6月至9月对成都市区的挥发性有机化合物（VOCs）进行了在线观测，以研究VOCs的浓度水平、变化特征、臭氧生成贡献（OFP）及来源贡献。结果表明，总挥发性有机化合物（TVOCs）的平均浓度为112.66 μg·m，其中烷烃（29.51%）和卤代烃（23.23%）为主要成分。VOCs的日峰值主要出现在上午10:00至11:00，受城市机动车、油气挥发及工业排放影响。对于夏季VOCs的OFP贡献，芳烃的贡献率最高（42.7%），其次是烯烃（27.4%）。关键活性物种为对二甲苯、乙烯、丙烯、邻二甲苯、异戊烷、环戊烷和丙烯醛。根据PMF模型的源解析，移动源是成都夏季VOCs的主要贡献者，对TVOCs的贡献率为34%，其次是工业源（17%）、挥发性油气（14%），溶剂使用和自然源的贡献率分别为11%和13%。因此，机动车和工业排放是成都VOCs的关键控制源，不过溶剂使用和油气挥发等污染源的控制也不容忽视。
