Mercury speciation in soils of the industrialised Thur River catchment (Alsace,France) |
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| Affiliation: | 1. Laboratoire de Chimie et Environnement, Université de Provence, 3 place Victor Hugo, case 29, 13331 Marseille Cedex 03, France;2. Laboratoire Agronomie Environnement Ecotoxicologie (LAEE), Ecole Nationale Supérieure Agronomique de Toulouse (ENSAT), Institut National Polytechnique (INP), Avenue de l’Agrobiopole, BP 32 607 Auzeville-Tolosane, 31326 Castanet-Tolosan Cedex, France;3. Laboratoire des Mécanismes de Transfert en Géologie, UMR 5563 CNRS/IRD/Université Paul Sabatier, 14 Avenue Edouard Belin, 31400 Toulouse, France;1. Environmental Systems Program, University of California, Merced, 5200 North Lake Road, Merced, CA 95343, USA;2. Anchor QEA, LLC, Portland, OR 97224, USA;1. Xinjiang Key Laboratory of Environmental Pollution and Bioremediation, Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Urumqi 830011, China;2. College of Environment, Zhejiang University of Technology, Hangzhou 310014, China;3. University of Chinese Academy of Sciences, Beijing 100049, China;4. Geomicrobiology Group, School of Life Sciences, University of Dundee, Dundee DD1 5EH, Scotland, UK;5. State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550002, China;6. Department of Chemical Engineering, National Taiwan University, Taipei 10617, Taiwan;7. Department of Zoology, College of Science, King Saud University, Riyadh 11451, Saudi Arabia;8. Department of Zoology, Faculty of Life and Earth Science, Rajshahi University Rajshahi 6205, Bangladesh;1. Key Laboratory of Geographic Information Science, Ministry of Education, East China Normal University, Shanghai, 200241, PR China;2. Institute of Eco-Chongming, East China Normal University, Shanghai, 200241, PR China;3. Key Laboratory of Soil Environment and Pollution Remediation, Institute of Soil Science, Chinese Academy of Sciences, Nanjing, 210008, PR China;4. State Key Laboratory of Pollution Control and Resources Reuse, School of the Environment, Nanjing University, Nanjing, 210023, PR China;5. Environmental and Life Sciences Program (EnLS), Trent University, Peterborough, Ontario, Canada;1. Institute of Metal Research, Chinese Academy of Sciences, Key Laboratory of Nuclear Materials and Safety Assessment, Division of Materials for Special Environments, China;2. Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, State Key Laboratory of Rare Earth Utilization, China;3. Renewable Bioproducts Institute, Georgia Institute of Technology, China;1. College of Food Science and Engineering, Nanjing University of Finance and Economics/The Jiangsu Province Center of Cooperative Innovation for Modern Grain Circulation and Security, Nanjing 210023, People’s Republic of China;2. College of Food Science and Technology, Nanjing Agricultural University, Nanjing 210095, People’s Republic of China;1. School of Environment, Nanjing University, State Key Laboratory of Pollution Control and Resource Reuse, Nanjing, Jiangsu Province, PR China;2. Environmental and Resource Studies Program, Trent University, Peterborough, Ontario, Canada;3. Department of Chemistry, Trent University, Peterborough, Ontario, Canada |
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| Abstract: | ![]()
Methylmercury (MeHg) and total Hg (THg) concentrations in soil profiles were monitored in the Thur River basin (Alsace, France), where a chlor-alkali plant has been located in the city of Vieux-Thann since the 1930s. Three soil types were studied according to their characteristics and location in the catchment: industrial soil, grassland soil and alluvial soil. Contamination of MeHg and THg in soil was important in the vicinity of the plant, especially in industrial and alluvial soil. Concentrations of MeHg reached 27 ng g−1 and 29,000 ng g−1 for THg, exceeding the predictable no effect concentration. Significant ecotoxicological risk exists in this area and remedial actions on several soil types are suggested. In each type of soil, MeHg concentrations were highest in topsoil, which decreased with depth. Concentrations of MeHg were negatively correlated with soil organic matter and total S, particularly when MeHg concentrations exceeded 8 ng g−1. Under these conditions, MeHg concentrations in soil seemed to be influenced by THg, soil organic matter and total S concentrations. It was found that high MeHg/THg ratios (near 2%) in soil were mainly related to the combined soil environmental conditions such as low THg concentrations, low organic C/N ratios (<11) and relatively low pH (5–5.5). Nevertheless, even when the MeHg/THg ratio was low (∼0.04%), MeHg and THg concentrations were elevated, up to 13 ng g−1 and to 29,000 ng g−1, respectively. Thus, both THg and MeHg concentrations should be taken into account to assess potential environmental risks of Hg. |
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