School of Materials Science and Engineering, Beijing Institute of Technology, Beijing 100011, China; State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing 100012, China.
State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing 100012, China; Collaborative Innovation Center on Atmospheric Environment and Equipment Technology, Nanjing University of Information Science and Technology, Nanjing 210044, China.
J Environ Sci (China). 2018 Sep;71:150-167. doi: 10.1016/j.jes.2017.12.017. Epub 2018 Jan 5.
Continuous observation of isoprene, α-pinene and β-pinene was carried out in a typical urban area of Beijing from March 2014 to February 2015, using an AirmoVOC online analyzer. Based on the analysis of the ambient level and variation characteristics of isoprene, α-pinene and β-pinene, the chemical reactivity was studied, and their sources were identified. Results showed that the concentrations of isoprene, α-pinene and β-pinene in the urban area of Beijing were lower than those in richly vegetated areas; the concentrations of isoprene were at a moderate level compared with those of previous studies of Beijing. Concentrations of isoprene, α-pinene and β-pinene showed different seasonal, monthly, daily and diurnal variations, and all of the three species showed higher level at night than those in the daytime as a whole, the variations of isoprene, α-pinene and β-pinene mainly influenced by emission of sources, photochemical reaction, and meteorological parameters. Isoprene was the largest contributor to the total OFP values than α-pinene and β-pinene. α-Pinene was the largest contributor to the total SOAFP values than isoprene and β-pinene in autumn, while isoprene was the largest one in other seasons. Isoprene, α-pinene and β-pinene were derived mainly from biological sources; and α-pinene level were also affected by industrial sources. To reduce the concentrations of isoprene, α-pinene and β-pinene, it is necessary to scientifically select urban green plant species, and more strict control measures should be taken to reduce the emission of α-pinene from industrial sources, such as artificial flavors and resins synthesis processes.
从 2014 年 3 月到 2015 年 2 月，我们在北京的一个典型城区使用 AirmoVOC 在线分析仪对异戊二烯、α-蒎烯和β-蒎烯进行了连续观测。通过分析异戊二烯、α-蒎烯和β-蒎烯的环境水平和变化特征，研究了它们的化学活性，并确定了它们的来源。结果表明，北京城区的异戊二烯、α-蒎烯和β-蒎烯浓度低于植被丰富地区；与北京以前的研究相比，异戊二烯浓度处于中等水平。异戊二烯、α-蒎烯和β-蒎烯的浓度表现出不同的季节性、月度、日变化和昼夜变化，总体上所有三种物质在夜间的浓度都高于白天，异戊二烯、α-蒎烯和β-蒎烯的变化主要受排放源、光化学反应和气象参数的影响。异戊二烯对总 OFP 值的贡献大于α-蒎烯和β-蒎烯。在秋季，α-蒎烯对总 SOAFP 值的贡献大于异戊二烯和β-蒎烯，而在其他季节，异戊二烯的贡献最大。异戊二烯、α-蒎烯和β-蒎烯主要来源于生物源；α-蒎烯水平还受到工业源的影响。为了降低异戊二烯、α-蒎烯和β-蒎烯的浓度，有必要科学地选择城市绿化植物种类，并采取更严格的控制措施来减少工业源（如人工香料和树脂合成过程）排放的α-蒎烯。
