Department of Chemistry, Analytical and Testing Center, Capital Normal University, Beijing 100048, China; State Key Laboratory of Severe Weather & Key Laboratory for Atmospheric Chemistry of China Meteorology Administration, Chinese Academy of Meteorological Sciences, Beijing 100081, China.
Department of Chemistry, Analytical and Testing Center, Capital Normal University, Beijing 100048, China.
J Environ Sci (China). 2019 Jun;80:107-115. doi: 10.1016/j.jes.2018.11.009. Epub 2018 Nov 29.
Secondary organic aerosols (SOAs) are an important component of particulates, but whether biogenic SOAs (BSOAs) or anthropogenic SOAs (ASOAs) are the dominant contributors to haze pollution remains poorly characterized. In this study, particulate samples were collected from September 2014 to August 2015 at an urban site in Jinan, which is the capital of Shandong Province and a typical city in the North China Plain. The PM samples were analyzed for BSOA (isoprene (SOA) and monoterpenes (SOA)) and ASOA (aromatic (SOA)) tracers. The concentrations of the SOA tracer (1.1 ± 1.0 ng/m) were lowest, and those of SOA tracers (41.8 ± 86.2 ng/m) were highest, with the concentrations of SOA tracers (19.4 ± 9.9 ng/m) being intermediate. The SOA tracers were more abundant in the summer and less abundant in the winter. Both SOA and SOA increased with increasing ozone level but decreased with increasing NOx level. Correlation analysis revealed a good correlation between 2,3-dihydroxy-4-oxopentanoic acid and levoglucosan levels in three seasons. These results suggested that biomass burning activities occurring in the NCP can enhance the emissions of aromatics and should be controlled, especially in the autumn and winter. SOA tracers were classified according to pollution degree, and the results showed that as pollution increases, the contributions of SOA increase. These results indicate that reducing anthropogenic emissions is necessary to prevent SOA pollution, especially during heavy pollution episodes.
次生有机气溶胶 (SOAs) 是颗粒物的重要组成部分，但生物源 SOAs (BSOAs) 和人为源 SOAs (ASOAs) 哪个是霾污染的主要贡献者仍不清楚。本研究于 2014 年 9 月至 2015 年 8 月在山东省省会济南的一个城区采集了颗粒物样品。利用 PM 样品分析了 BSOA（异戊二烯 SOA 和单萜 SOA）和 ASOA（芳香族 SOA）示踪剂。SOA 示踪剂（1.1 ± 1.0 ng/m）浓度最低，SOA 示踪剂（41.8 ± 86.2 ng/m）浓度最高，SOA 示踪剂（19.4 ± 9.9 ng/m）浓度居中。夏季 SOA 示踪剂较丰富，冬季较匮乏。SOA 和 SOA 都随着臭氧浓度的增加而增加，随着氮氧化物浓度的增加而减少。相关性分析表明，三个季节中 2,3-二羟基-4-氧戊酸和左旋葡聚糖水平之间存在很好的相关性。这些结果表明，华北平原发生的生物质燃烧活动会增加芳香族化合物的排放，应加以控制，尤其是在秋季和冬季。根据污染程度对 SOA 示踪剂进行了分类，结果表明随着污染程度的增加，SOA 的贡献也随之增加。这些结果表明，减少人为排放对于防止 SOA 污染，尤其是在重污染期间是必要的。
