Pollution characteristics and source apportionment of water-soluble ions in atmospheric PM2.5 in two urban areas of Baotou city,China,2022
Objective To analyze the pollution characteristics and source apportionment of water-soluble ions in atmospheric fine particulate matter(PM2.5)in Donghe district and Qingshan district of Baotou city,China.Methods On the 10th-16th days of each month and haze days in 2022,atmospheric PM2.5 samples were collected at two surveillance sites in Donghe district and Qingshan dis-trict of Baotou city,and the mass concentrations of five water-soluble ions(SO42-,NO3-,Cl-,F-,and NH4+)in atmospheric PM2.5 were determined by ion chromatography.The secondary conversion of SO2 and NO2 in the atmosphere was determined by sulfur oxida-tion ratio(SOR)and nitrogen oxidation ratio(NOR).Whether the air pollution was caused by stationary pollution sources or mobile pollution sources was determined by[NO3-]/[SO42-]ratio.Results The mass concentrations M(P25,P75)of SO4-2,NO3-,Cl-,F-,and NH4+in atmospheric PM2.5 at the surveillance sites in Donghe district and Qingshan district were 3.282(2.055,4.620),1.510(0.747,3.284),0.916(0.268,1.750),0.228(0.097,0.473),1.553(0.829,3.019)µg/m3 and 2.856(1.720,4.963),1.451(0.747,2.940),0.679(0.171,1.860),0.177(0.076,0.423),and 1.408(0.672,2.272)μg/m3,respec-tively.The SOR of atmospheric PM2.5 was the highest in the first quarter in Donghe district and the highest in the third quarter in Qing-shan district.The NOR of atmospheric PM2.5 in both Donghe district and Qingshan district was the highest in the first quarter.The an-nual[NO3-]/[SO42-]ratios in Donghe district and Qingshan district were 0.49 and 0.48,respectively.Conclusion In two urban areas of Baotou city,there are some differences in the pollution levels of five water-soluble ions in atmospheric PM2.5.Stationary pollu-tion sources are the main sources of air pollution in this city.
fine particulate matter(PM2.5)water-soluble ionspollution characteristics
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