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| Analysis of PM2.5 water-soluble ionic pollution characteristics in Shijiazhuang based on high resolution MARGA |
| An Xuewen, Ni Shuangying, Zhao Weifeng, Wang Honghua, Meng Chenchen, Su Wenkang |
| Hebei Provincial Academy Environmental Science, Shijiazhuang 050037, China |
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Abstract From December 1, 2018 to November 30, 2019, the high time resolution online gas and aerosol composition monitoring system (MARGA) was used to monitor the mass concentration of atmospheric PM2.5 water-soluble ions in Shijiazhuang city, combining with the gaseous pollutants and meteorological monitoring data analyze the pollution characteristics of PM2.5 and its water-soluble ions before and after the spring festival. The results showed, that during the monitoring period, the average annual mass concentration of water-soluble ions of PM2.5 was 43.9±43.1 μg·m-3, which accounted for 58.2% of PM2.5, and the order of mass concentration was NO3->SO42->NH4+>Cl->Ca2+>K+>Na+>Mg2+. The characteristics of seasonal changes are: winter (70.1 μg·m-3)>autumn (40.3 μg·m-3)>spring (37.5 μg·m-3)>summer (28.1 μg·m-3). Water-soluble ions are in the "ammonium-rich" state in all four seasons. In summer, NH4+ mainly exists in the form of (NH4)2SO4, and NH4NO3, and there is also some NH4Cl; in winter, NH4+ was mainly (NH4)2SO4. The average value of NO3-/SO42- ratio was 1.61, it can be considered that Shijiazhuang was mainly affected by mobile sources during the monitoring period, and the impact was greatest in autumn. The hourly average values of SOR and NOR were 0.31 and 0.21 respectively and there was obvious secondary conversion.
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