PM2.5 samples were collected during autumnin Xingtai City from October 15th to November 14th, 2017, and the water- soluble ions Cl-, NO3-, SO42-, NH4+, Ca2+, Na+, Mg2+ and K+ in the PM2.5 were determinedby ion chromatography. The results showed during sample collection period r(PM2.5) was (130.0±74.9)mg/m3. The average water-soluble ion concentration was (69.8±11.4)mg/m3, which accounted for 33.6% of r(PM2.5). SO42-, NO3- and NH4+ were the main ions in PM2.5, totally accounting for 89.7% of the water-soluble ions in autumn. With the air pollution getting serious, the concentration of water-soluble ions increased with the increase of ρ(PM2.5), and the proportion of NO3-, NH4+ and SO42- increased gradually. Conversely the proportion of other ions decreased, and Ca2+ was especially obvious which indicated that ρ(PM2.5) was mainly affected by secondary inorganic transformation. The average value of SOR and NOR during sample collection period were 0.36 and 0.25, respectively, and showed that the secondary transformation of SO2 and NO2 is seriously important and the secondary pollution was more serious. In addition, SOR and NOR are positively correlated with relative humidity and air temperature, and SOR is more sensitive to both. PM2.5 in Xingtai City was slightly alkaline during autumn. NH4+ were primarily in NH4NO3 and NH4HSO4 forms in PM2.5. The N/S average value was 2.13, indicating that mobile source contributed more to PM2.5 during autumn. PMF analysis revealed that secondary transformation, combustion and dust were the main potential sources of the ionic components of PM2.5 during autumn in Xingtai City.
王少博, 王涵, 张敬巧, 李慧, 吴亚君, 刘锐泽, 王淑兰. 邢台市秋季PM2.5及水溶性离子污染特征[J]. 中国环境科学, 2020, 40(5): 1877-1884.
WANG Shao-bo, WANG Han, ZHANG Jing-qiao, LI Hui, WU Ya-jun, LIU Rui-ze, WANG Shu-lan. Characterization analysis of PM2.5 and water-soluble ions during autumn in Xingtai City. CHINA ENVIRONMENTAL SCIENCECE, 2020, 40(5): 1877-1884.
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