The effects of haze on dew quality in the urban ecosystem of Changchun, Jilin Province, China

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• 作者：Yingying Xu ; Hui Zhu ; Jie Tang
• 关键词：Chemical characterization ; Haze ; Particulate matter ; Remove ability ; Urban dew
• 刊名：Environmental Monitoring and Assessment
• 出版年：2016
• 出版时间：February 2016
• 年：2016
• 卷：188
• 期：2
• 全文大小：571 KB
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• 作者单位：Yingying Xu (1) (2)
  Hui Zhu (3)
  Jie Tang (2)
  
  1. Key Laboratory of Songliao Aquatic Environment, Ministry of Education, Jilin Jianzhu University, Xincheng St., Dist 5088, 130118, Changchun, China
  2. College of Resources and Environment, Jilin University, Qianjin St., Dist 2699, 130021, Changchun, China
  3. Key Laboratory of Wetland Ecology and Environment, Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, Shengbei St., Dist 4888, 130102, Changchun, China
  
• 刊物类别：Earth and Environmental Science
• 刊物主题：Environment
  Monitoring, Environmental Analysis and Environmental Ecotoxicology
  Ecology
  Atmospheric Protection, Air Quality Control and Air Pollution
  Environmental Management
  
• 出版者：Springer Netherlands
• ISSN：1573-2959

文摘

Dew samples were collected during both normal weather and haze events (hazy days) to investigate the chemical characteristics of dew in Changchun, Jilin, China, from 2013 to 2015. The analysis included measures of the following parameters: pH, electrical conductivity (EC), total dissolved solid (TDS), and the concentration of PM_2.5, PM₁₀, major cations (NH₄ +, Na+, K+, Ca2+, and Mg2+), and major anions (F−, Cl−, SO₄ 2−, and NO₃ −). The results demonstrated that dew water quality from hazy days was much lower quality than that on normal days with a lower mean pH during hazy days (5.75) when compared with that of normal days (6.56); that is, dew water was more acidic in stable atmospheric conditions. Both EC (542.71 μs/cm) and TDS (271.36 mg/L) of dew on hazy days were higher than that on normal days. The mean concentration of particulate matter <2.5 and 2.5–10 μm in diameter (PM_2.5 and PM₁₀, respectively) was 21.69 and 51.56 mg/L on normal days and were over 2.48 and 1.79 times higher on hazy days, respectively; that is, dew removed more fine particles on hazy days. On hazy days, the concentrations of water-soluble ions were 3.01–9.32 times higher than levels on normal days. The concentrations of secondary species and K+ on hazy days were much higher than those of other ions. The results indicated dew mainly removed aerosols from automobile exhaust, and industrial waste gas emissions, while to a lesser extent dew did scavenge some water-soluble crustal ions.