Quantifying natural source mercury emissions from the Ivanhoe Mining District,north-central Nevada,USA |
| |
| Institution: | 1. Program of Hydrologic Sciences/172, University of Nevada, Reno, NV 89557, USA;2. Department of Environmental and Resource Sciences/370, University of Nevada, Reno, NV 89557, USA;3. Environmental Sciences Division, Oak Ridge National Laboratory, P.O. Box 2008, Oak Ridge, TN 37831, USA;1. CNR-Institute of Atmospheric Pollution Research, Division of Rende, UNICAL-Polifunzionale, 87036 Rende, Italy;2. British Antarctic Survey, High Cross, Madingley Road, Cambridge CB3 0ET, United Kingdom;3. CNR-Institute of Atmospheric Pollution Research, Area della Ricerca di Roma 1, Via Salaria km 29,300, Monterotondo, 00015 Rome, Italy;1. Unit of Sustainable Forest Management, Department of Vegetal Production, University of Santiago de Compostela, E-27002 Lugo, Spain;2. Subdirección General de Recursos Forestales, Xunta de Galicia, E-15704 Santiago de Compostela, Spain;3. Department of Soil Science and Agricultural Chemistry, University of Santiago de Compostela, E-27002 Lugo, Spain;1. State Key Laboratory of Engines, Tianjin University, Tianjin 300072, China;2. Dongfeng Nissan Passenger Vehicle Company, Guangzhou 510800, China;3. School of Aeronautical Engineering, Civil Aviation University of China, Tianjin 300300, China;1. Department of Ecology, Biogeochemistry and Environmental Protection, Wroc?aw University, ul. Kanonia 6/8, 50-328 Wroclaw, Poland;2. Department of Applied Geology, Geochemistry and Environmental Management Institute of Geological Sciences, University of Wroc?aw, Cybulskiego 32, 50-205 Wroc?aw, Poland;3. Radboud University Nijmegen, Institute for Water and Wetland Research, Department of Environmental Science, Huygens building, Heyendaalseweg 135, 6525 AJ Nijmegen, The Netherlands |
| |
| Abstract: | In order to assess the importance of mercury emissions from naturally enriched sources relative to anthropogenic point sources, data must be collected that characterizes mercury emissions from representative areas and quantifies the influence of various environmental parameters that control emissions. With this information, we will be able to scale up natural source emissions to regional areas. In this study in situ mercury emission measurements were used, along with data from laboratory studies and statistical analysis, to scale up mercury emissions for the naturally enriched Ivanhoe Mining District, Nevada. Results from stepwise multi-variate regression analysis indicated that lithology, soil mercury concentration, and distance from the nearest fault were the most important factors controlling mercury flux. Field and lab experiments demonstrated that light and precipitation enhanced mercury emissions from alluvium with background mercury concentrations. Diel mercury emissions followed a Gaussian distribution. The Gaussian distribution was used to calculate an average daily emission for each lithologic unit, which were then used to calculate an average flux for the entire area of 17.1 ng Hg m?2 h?1. An annual emission of ～8.7×104 g of mercury to the atmosphere was calculated for the 586 km2 area. The bulk of the Hg released into the atmosphere from the district (～89%) is from naturally enriched non-point sources and ～11% is emitted from areas of anthropogenic disturbance where mercury was mined. Mercury emissions from this area exceed the natural emission factor applied to mercury rich belts of the world (1.5 ng m?2 h?1) by an order of magnitude. |
| |
| Keywords: | |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
