Analysis of characteristics of water-soluble ions in PM2.5 in Guilin based on the MARGA
HUANG Jiong-li1, CHEN Zhi-ming1, MO Zhao-yu1,2, LI Hong3, LIU Hui-lin1, LI Hong-jiao1, LIANG Gui-yun1, YANG Jun-chao1, ZANG Da-biao1, LI Yong-shan4
1. Scientific Research Academy of Guangxi Environmental Protection, Nanning 530022, China;
2. Department of Environmental Science and Engineering, Fudan University, Shanghai 200433, China;
3. Chinese Research Academy of Environmental Sciences, Beijing 100012, China;
4. Guilin Environmental Monitoring Centre, Guilin 541002, China
The composition of PM2.5 was serially on-line monitored by using Monitor for Aerosols and Gases in Ambient Air (MARGA ADI 2080) at atmosphere monitoring sites of Guilin in a time span of February 17 to March 24, 2017 continuously. Composition characteristics of water-soluble inorganic matter, secondary conversion mechanism and aerosol acidity were analyzed combining with environmental monitoring data and meteorological monitoring data. The results shown that variability of 8water-soluble ions concentration was in consistent with the trend of PM2.5 varieties in Guilin. The average mass concentration of the total water-soluble ions was 29.27μg/m3, and the average mass concentration of three secondary water soluble ions SO42-, NH4+and NO3- was 26.91μg/m3, accounting for 93.50% of PM2.5, indicating that secondary water-soluble ions were the major components of PM2.5 in Guilin. There was a significant positive correlation between secondary water-soluble ions, namely SO42-, NH4+ and NO3- (all the correlation coefficients were over 0.80), indicating that the mechanism of evolution and deposition of secondary water-soluble ions in the atmosphere are similar to each other. Visibility declined in terms of power function with the increase of the water-soluble ions, especially secondary water-soluble ions despite if there was rain fell or not. When the rain fell significantly (accumulated rainfall of 24hours≥10mm), the effect of wet removal was obvious. In sunny days and days of light rainy, the focal point should be the control of vehicle exhaust, biomass burning and dust pollution. SOR and NOR were 0.35 and 0.12, respectively. SO2 was converted to SO42- by homogeneous and heterogeneous oxidation reactions at the same time. NOx was mainly converted to NO3- by photochemical reactions during the day. A pronounced diurnal cycle was found for most ions and gaseous precursors which could be attributed to their respective sources, formation mechanisms and meteorological conditions. The mean value of CE/AE was 1.5, indicating that most aerosols in Guilin were relatively alkaline. In PM2.5, SO42-, NO3- and Cl- mainly exist in the forms of (NH4)2SO4, NH4NO3 and NH4Cl, respectively. NH4+ in PM2.5 was related to local vehicle emissions. Regulatory actions in minimizing traffic emissions may represent the critical step in mitigating haze in Guilin.
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HUANG Jiong-li, CHEN Zhi-ming, MO Zhao-yu, LI Hong, LIU Hui-lin, LI Hong-jiao, LIANG Gui-yun, YANG Jun-chao, ZANG Da-biao, LI Yong-shan. Analysis of characteristics of water-soluble ions in PM2.5 in Guilin based on the MARGA. CHINA ENVIRONMENTAL SCIENCECE, 2019, 39(4): 1390-1404.
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