Atmospheric mercury deposition and its contribution of the regional atmospheric transport to mercury pollution at a national forest nature reserve, southwest China

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• 作者：Ming Ma ; Dingyong Wang ; Hongxia Du ; Tao Sun…
• 关键词：Mercury ; Subtropical forest ; Deposition fluxes ; Gaseous elemental mercury ; Source
• 刊名：Environmental Science and Pollution Research
• 出版年：2015
• 出版时间：December 2015
• 年：2015
• 卷：22
• 期：24
• 页码：20007-20018
• 全文大小：1,284 KB
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• 作者单位：Ming Ma (1)
  Dingyong Wang (1) (2)
  Hongxia Du (1)
  Tao Sun (1)
  Zheng Zhao (1)
  Shiqing Wei (1)
  
  1. Key Laboratory of the Three Gorges Reservoir Region’s Eco-Environment (Ministry of Education), College of Resource and Environment, Southwest University, Chongqing, 400715, China
  2. Chongqing Key Laboratory of Agricultural Resources and Environment, Chongqing, 400716, China
  
• 刊物类别：Earth and Environmental Science
• 刊物主题：Environment
  Environment
  Atmospheric Protection, Air Quality Control and Air Pollution
  Waste Water Technology, Water Pollution Control, Water Management and Aquatic Pollution
  Industrial Pollution Prevention
  
• 出版者：Springer Berlin / Heidelberg
• ISSN：1614-7499

文摘

Atmospheric mercury deposition by wet and dry processes contributes to the transformation of mercury from atmosphere to terrestrial and aquatic systems. Factors influencing the amount of mercury deposited to subtropical forests were identified in this study. Throughfall and open field precipitation samples were collected in 2012 and 2013 using precipitation collectors from forest sites located across Mt. Jinyun in southwest China. Samples were collected approximately every 2 weeks and analyzed for total (THg) and methyl mercury (MeHg). Forest canopy was the primary factor on THg and MeHg deposition. Simultaneously, continuous measurements of atmospheric gaseous elemental mercury (GEM) were carried out from March 2012 to February 2013 at the summit of Mt. Jinyun. Atmospheric GEM concentrations averaged 3.8?±-.5 ng m?, which was elevated compared with global background values. Sources identification indicated that both regional industrial emissions and long-range transport of Hg from central, northeast, and southwest China were corresponded to the elevated GEM levels. Precipitation deposition fluxes of THg and MeHg in Mt. Jinyun were slightly higher than those reported in Europe and North America, whereas total fluxes of MeHg and THg under forest canopy on Mt. Jiuyun were 3 and 2.9 times of the fluxes of THg in wet deposition in the open. Highly elevated litterfall deposition fluxes suggest that even in remote forest areas of China, deposition of atmospheric Hg0 via uptake by vegetation leaf may be a major pathway for the deposition of atmospheric Hg. The result illustrates that areas with greater atmospheric pollution can be expected to have greater fluxes of Hg to soils via throughfall and litterfall. Keywords Mercury Subtropical forest Deposition fluxes Gaseous elemental mercury Source