Concentrations and size distributions of water-soluble inorganic ions in aerosol particles in Taiyuan, Shanxi

被引：3
|
作者：
Wang L. [1 ,2 ]
Wen T.-X. [1 ]
Miao H.-Y. [1 ,3 ]
Gao W.-K. [1 ]
Wang Y.-S. [1 ]
机构：
[1] State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry (LAPC), Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing
[2] University of Chinese Academy of Sciences, Beijing
[3] China Meteorological Administration Training Center Liaoning Branch, Shenyang
来源：
Wen, Tian-Xue (wtx@dq.cern.ac.cn) | 1600年 / Science Press卷 / 37期
关键词：
Seasonal variation; Size distribution; Source; Taiyuan; Water-soluble inorganic ions;
D O I：
10.13227/j.hjkx.2016.09.002
中图分类号：
学科分类号：
摘要：
Size-resolved filter samples were collected in Taiyuan every other week from June 2012 to May 2014. The mass concentrations of water-soluble ions (Na+, NH4+, K+, Mg2+, Ca2+, F-, Cl-, NO3- and SO42-) were measured by ion chromatography. The results showed that the total concentrations of measured water-soluble ions were (15.39±9.91), (21.10±15.49) and (36.34±18.51) μg·m-3 in PM1.1, PM2.1 and PM9, respectively. In PM1.1 and PM2.1, secondary water-soluble ions (SO42-, NO3- and NH4+) comprised 87.59% and 86.30% of all water-soluble ions, respectively, while in PM9, SO42- and Ca2+ comprised 32.78% and 28.54% of all water-soluble ions, respectively. SO42- and NH4+ had higher concentrations in winter and summer, and lower in spring and autumn. NO3-, K+and Cl- presented similar seasonal variation with a descending order of winter>autumn>spring>summer, and Ca2+ and Mg2+ followed the sequence of spring>winter>autumn>summer. SO42- and NH4+ showed a unimodal size distribution and the peak in the fine mode shifted from 0.43-0.65 μm in spring and autumn to 0.65-1.1 μm in summer. NO3- showed a bimodal size distribution. NO3- and NH4+ were dominated by the fine mode peaking at 0.43-2.1 μm in winter, and NO3- was dominated by the coarse mode peaking at 4.7-5.8 μm in summer. K+, Na+and Cl- also showed a bimodal size distribution with the fine mode at 0.43-1.1 μm and the coarse mode at 4.7-5.8 μm. Ca2+, Mg2+ and F- were unimodal with the peak in the coarse mode of 4.7-5.8 μm. On heavily polluted days, the mass concentrations of secondary water-soluble ions and Cl- accumulated, and secondary water-soluble ions were unimodal with the peak in the fine mode of 1.1-2.1 μm. However, on clear days, secondary water-soluble ions showed a bimodal size distribution with the fine mode at 0.43-0.65 μm and the coarse mode at 4.7-5.8 μm. The peak of secondary water-soluble ions in the fine mode shifted. PCA analysis showed that the sources of water-soluble ions were dominated by the secondary formation, coal combustion, industrial emission, biomass burning, and soil particles or falling dust. © 2016, Science Press. All right reserved.
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页码：3249 / 3257
页数：8
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