Characteristics of mercury exchange flux between soil and air in the heavily air-polluted area,eastern Guizhou,China |
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| Institution: | 1. State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550002, PR China;2. Graduate School of the Chinese Academy Sciences, Beijing 100039, PR China;3. Key Laboratory of Terrestrial Ecological Process, Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang 110016, PR China;1. CNR-Institute of Atmospheric Pollution Research, Rome, Italy;2. Norwegian Institute of Air Pollution, Kjeller, Norway;3. CNR-Institute of Atmospheric Pollution Research, Division of Rende, Rende, Italy;4. Dep. for Environmental Chemistry, Institute of Coastal Research, Helmholtz-Zentrum Geesthacht, Germany;5. Gdansk University of Technology, Faculty of Chemistry, Gdansk, Poland;6. School of Engineering & Applied Sciences, Harvard University, Cambridge, MA, USA;1. Departamento de Química, ICEX, UFMG, Av. Antônio Carlos, 6627, 31270-901 Belo Horizonte, MG, Brazil;2. IFMG—Campus Formiga, Rua Padre Alberico, 44, São Luiz, Formiga, MG, Brazil;3. IFAM—Campus Manaus Centro, Av. Sete de setembro, 1975, 69020-120 Manaus, AM, Brazil;1. Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing, 100085, China;2. University of Chinese Academy of Sciences, Beijing, 100049, China;1. Key Lab of Urban Environment and Health, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, PR China;2. University of Chinese Academy of Sciences, Beijing 100086, PR China;3. National University of Singapore, 117548 Singapore, Singapore |
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| Abstract: | To investigate the characteristics of mercury exchange between soil and air in the heavily air-polluted area, total gaseous mercury (TGM) concentration in air and Hg exchange flux were measured in Wanshan Hg mining area (WMMA) in November, 2002 and July–August, 2004. The results showed that the average TGM concentrations in the ambient air (17.8–1101.8 ng m?3), average Hg emission flux (162–27827 ng m?2 h?1) and average Hg dry deposition flux (0–9434 ng m?2 h?1) in WMMA were 1–4 orders of magnitude higher than those in the background area. It is said that mercury-enriched soil is a significant Hg source of the atmosphere in WMMA. It was also found that widely distributed roasted cinnabar banks are net Hg sources of the atmosphere in WMMA. Relationships between mercury exchange flux and environmental parameters were investigated. The results indicated that the rate of mercury emission from soil could be accelerated by high total soil mercury concentration and solar irradiation. Whereas, highly elevated TGM concentrations in the ambient air can restrain Hg emission from soil and even lead to strongly atmospheric Hg deposition to soil surface. A great amount of gaseous mercury in the heavily polluted atmosphere may cycle between soil and air quickly and locally. Vegetation can inhibit mercury emission from soil and are important sinks of atmospheric mercury in heavily air-polluted area. |
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