| 沈阳市冬季大气PM2.5中水溶性离子污染特征及来源解析 |
| 摘要点击 2793 全文点击 876 投稿时间：2020-06-25 修订日期：2020-07-17 |
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| 中文关键词 PM2.5 污染事件 水溶性离子 来源解析 沈阳 |
| 英文关键词 PM2.5 pollution episode water-soluble ions source apportionment Shenyang |
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| 中文摘要 |
| 为研究沈阳市冬季PM2.5和水溶性离子的污染特征，使用URG-9000D在线监测系统于2018年冬季对大气颗粒物和气体组分进行连续采样.结果表明，采样期间沈阳市PM2.5的平均质量浓度为80.67 μg·m-3，总水溶性离子质量浓度变化范围为2.68~132.79 μg·m-3.与清洁天相比，污染天NO3-、SO42-和NH4+（SNA）占比明显增加，占到PM2.5的43.7%.静稳天气时SO2短时间内的迅速累积使得沈阳市冬季大气PM2.5有暴发性增长现象.Pearson相关性分析可知，SNA、Cl-与PM2.5之间的相关系数均达0.78以上，表明沈阳市冬季PM2.5的主要贡献组分为SNA和Cl-.PMF源解析表明沈阳市冬季污染物来源主要包括二次反应源、燃煤和生物质燃烧源以及扬尘源. |
| 英文摘要 |
| In order to explore the characteristics of PM2.5 and water-soluble ions in Shenyang in winter, the URG-9000D online monitoring system was used to continuously sample PM2.5 and gas components during 2018. The results indicated that the average concentration of PM2.5 in Shenyang during the sampling period was 80.67 μg·m-3, and the total water-soluble ion concentration ranged from 2.68 to 132.79 μg·m-3. Compared with clean days, the proportion of NO3-, SO42-, and NH4+ (SNA) in polluted days increased significantly, reached 43.7% of PM2.5. The rapid accumulation of SO2 in a short period of time made atmospheric PM2.5 explosively increase in Shenyang in winter. A Pearson correlation analysis showed that the correlation coefficients of SNA, Cl-, and PM2.5 were all above 0.78, indicating that the main contribution components of winter PM2.5 in Shenyang were SNA and Cl-. The apportionment of PMF sources indicated that the sources of pollutants in winter in Shenyang mainly included secondary reaction sources, coal and biomass combustion sources, and dust sources. |
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