Characteristics and optical properties of water-soluble ion pollution in the northern suburbs of Nanjing
WANG Xin1, AN Jun-lin1, SU Xiao-qian1, LANG Jing-shu2, LIU Jing-da1
1. Key Laboratory of Meteorological Disaster, Ministry of Education, Joint International Research Laboratory of Climate and Environment Change, Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters, Nanjing University of Information Science and Technology, Nanjing 210044, China;
2. Meteorological Observation Centre of CMA, Beijing 100081, China
In order to analyze the characteristics of water-soluble ion pollution and its extinction contribution in the northern suburbs of Nanjing, PM2.5 observation experiments were carried out from March 15 to April 15, July, and October in 2017, and the concentration characteristics of PM2.5 and its components, the conversion characteristics of water-soluble ions and their precursors, and the optical characteristics of water-soluble ions in the three seasons of in Nanjing were analyzed. The results showed that the mass concentration of PM2.5 during sampling is (93.8 ±40.3)μg/m3. Among them, 54.2% were water-soluble ions, and its total mass concentration was (50.9±25.6)μg/m3, and secondary water-soluble ions (SNA) accounted for 76.8% of water-soluble ions. The distribution of each water-soluble ion component was:NO3- > SO42- > NH4+ > Ca2+ > Cl- > NO2- > K+ > F- > Mg2 + > Na+. In terms of seasonal changes, PM2.5 and main water-soluble ions were high in spring and low in summer, but NO3- < SO42- in summer. The average values ??of sulfur conversion rate (SOR) and nitrogen conversion rate (NOR) during the sampling period were 0.38 and 0.22, which indicated that Nanjing had a strong secondary conversion process. During the sampling period, the average[NO3-]/[SO42-] The value of was 1, which indicated that water-soluble ions were mainly derived from emissions from mobile sources. The atmospheric extinction coefficient calculated by IMPROVE formula was lower than the actual value, but it can more accurately reflect the trend of Nanjing extinction coefficient. The extinction contribution of each component was (NH4) 2SO4 (38.9%), NH4NO3 (36.7%), POM (13.6%), EC (9.3%), NO2 (1.5%). Among them, the SNA extinction contribution accounted for more than 70%, the SNA extinction contribution was the largest in spring, and the smallest in summer.
王鑫, 安俊琳, 苏筱倩, 梁静舒, 刘静达. 南京北郊水溶性离子污染特征及其光学特性[J]. 中国环境科学, 2020, 40(2): 506-512.
WANG Xin, AN Jun-lin, SU Xiao-qian, LANG Jing-shu, LIU Jing-da. Characteristics and optical properties of water-soluble ion pollution in the northern suburbs of Nanjing. CHINA ENVIRONMENTAL SCIENCECE, 2020, 40(2): 506-512.
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