Diurnal Variations and Source Apportionment of Water-soluble Ions in PM2.5 During Winter in Nanjing Jiangbei New Area

QIU Chen-chen1 YU Xing-na1 DING Cheng1 SHI Zheng1 ZHANG Rui-fang1 HOU Si-yu1 HOU Xin-hong1

(1.Key Laboratory for Aerosol-Cloud-Precipitation of China Meteorological Administration, Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disaster, Nanjing University of Information Science and Technology, Nanjing, China 210044)

【Abstract】To gain a better understanding of the day-night variation characteristics of water-soluble ions, PM2.5 samples were continuously collected for two months in the Nanjing Jiangbei New Area during winter. The diurnal variation and sources of watersoluble ions were studied. Results showed that the mass concentration of water-soluble ions ranged from 17.07 μg·m−3 to 168.43μg·m−3 with a mean value of (59.01 ± 30.75) μg·m−3. The average mass concentration of water-soluble ions in daytime was higher than that in the nighttime. The concentration ratio of NO3 and NH4+ to total ion concentrations was higher at night, while SO42− and Cl were higher during daytime. SO42−, NO3, and NH4+ (SNA) were the dominant species of water-soluble ions in PM2.5 in Nanjing. The mass concentration of SNA on polluted days was higher than that on clean days. The ratio of the anion-cation balance ( AE/CE) was larger than 1, indicating that the PM2.5 was acidic. There was a significant linear correlation between NH4+ with NO3 and SO42−, indicating that it occurred mainly in the form of NH4NO3 and (NH4)2SO4 in PM2.5. The PMF source apportionment indicated that water-soluble ions of PM2.5 were mainly derived from motor vehicle emissions, fossil fuel combustion, biomass burning, and dust in the Nanjing Jiangbei New Area.

【Keywords】 Nanjing; PM2.5; water-soluble ions; day-night characteristics; source analysis;


【Funds】 The National Key Research and Development Program of China (2016YFC0203501) National Natural Science Foundation of China (41775154) Six Talent Peaks Project of Jiangsu (JNHB-057)

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This Article


CN: 11-1895/X

Vol 41, No. 02, Pages

February 2020


Article Outline


  • 1 Materials and methods
  • 2 Results and discussion
  • 3 Conclusions
  • References