Wang Lu, Wen Tian-Xue, Miao Hong-Yan, Gao Wen-Kang, Wang Yue-Si
State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry(LAPC), Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029, China.
University of Chinese Academy of Sciences, Beijing 100049, China.
Huan Jing Ke Xue. 2016 Sep 8;37(9):3249-3257. doi: 10.13227/j.hjkx.2016.09.002.
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, NH, K, Mg, Ca, F, Cl, NO and SO) 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 in PM, PM and PM, respectively. In PM and PM, secondary water-soluble ions (SO, NO and NH) comprised 87.59% and 86.30% of all water-soluble ions, respectively, while in PM, SO and Ca comprised 32.78% and 28.54% of all water-soluble ions, respectively. SO and NH had higher concentrations in winter and summer, and lower in spring and autumn. NO, Kand Cl presented similar seasonal variation with a descending order of winter >autumn >spring >summer, and Ca and Mg followed the sequence of spring >winter >autumn >summer. SO and NH 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. NO showed a bimodal size distribution. NO and NH were dominated by the fine mode peaking at 0.43-2.1 μm in winter, and NO was dominated by the coarse mode peaking at 4.7-5.8 μm in summer. K, Naand 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. Ca, Mg 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.
2012年6月至2014年5月期间，每隔一周在太原采集粒径分辨的滤膜样本。通过离子色谱法测量水溶性离子（Na、NH、K、Mg、Ca、F、Cl、NO和SO）的质量浓度。结果表明，在PM、PM和PM中，测得的水溶性离子总浓度分别为（15.39±9.91）、（21.10±15.49）和（36.34±18.51）μg·m。在PM和PM中，二次水溶性离子（SO、NO和NH）分别占所有水溶性离子的87.59%和86.30%，而在PM中，SO和Ca分别占所有水溶性离子的32.78%和28.54%。SO和NH在冬季和夏季浓度较高，在春季和秋季较低。NO、K和Cl呈现相似的季节变化，顺序为冬季>秋季>春季>夏季，Ca和Mg的顺序为春季>冬季>秋季>夏季。SO和NH呈现单峰粒径分布，细模态峰值在春季和秋季为0.43 - 0.65μm，在夏季变为0.65 - 1.1μm。NO呈现双峰粒径分布。冬季，NO和NH以细模态为主，峰值在0.43 - 2.1μm，夏季NO以粗模态为主，峰值在4.7 -
