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| 南京市冬季PM2.5中水溶性离子污染特征研究 |
| Pollution Characteristics of Water soluble Ions in PM2.5 in Winter in Nanjing |
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| DOI： |
| 中文关键词: PM2.5 水溶性离子 污染特征 在线监测 冬季 南京 |
| 英文关键词: PM2.5 Water-soluble ions Pollution characteristic Online monitoring Winter Nanjing |
| 基金项目:江苏省环境监测科研基金资助项目（1707）；南京市环保科技基金资助项目（201909） |
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| 中文摘要: |
| 基于城市超级站对2018年12月—2019年2月南京市在线水溶性离子污染特征进行研究。结果表明：监测期间水溶性无机离子(WSIs)质量浓度均值为45.7μg/m3，占PM2.5的67.8%，各离子排序为NO3-＞ SO42-＞NH4+＞Cl-＞K+＞Ca2+＞Na+＞Mg2+。二次离子（SNA）是PM2.5主要组分，大气气溶胶呈中性。各离子日变化存在差异，SNA变化趋势和WSIs基本一致。南京市冬季存在明显SO2和NO2向SO42-和NO3-二次转化；NO3-/SO42-均值为1.96，移动源增量大于固定源。通过相关性和三相聚类分析可知，SNA主要结合方式为(NH4)2SO4和NH4NO3。主成分分析表明，南京市冬季PM2.5中水溶性离子主要来源是二次转化，燃煤、生物质燃烧和土壤建筑扬尘也有贡献。 |
| 英文摘要: |
| The pollution characteristics of online water-soluble ions in Nanjing from December 2018 to February 2019 were studied based on urban atmospheric supersite. The results showed that the average mass concentration of water-soluble inorganic ions (WSIs) during the monitoring period was 45.7 μg/m3, accounting for 67.8% of PM2.5. The order of ion concentration was NO3-＞ SO42-＞NH4+＞Cl-＞K+＞Ca2+＞Na+＞Mg2+. Secondary ions（SNA）were the main components of PM2.5, and atmospheric aerosol was neutral. The daily variation of each ion concentration was different. The variation trend of SNA was basically consistent with that of WSIs. There was obvious secondary transformation of SO2 and NO2 to SO42- and NO3- in Nanjing in winter. The ratio of average concentration of NO3-/ SO42- was 1.96, and the increment of mobile source was greater than that of stationary source. Correlation and three-phase cluster analysis showed that the main combination modes of SNA were (NH4)2SO4 and NH4NO3. Principal component analysis showed that the main source of water-soluble ions in PM2.5 in Nanjing in winter was from secondary transformation. In addition, coal combustion, biomass combustion, soil dust and building construction dust also made contribution. |
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