Origin and mobility of humic colloids in the Gorleben aquifer system |
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| Institution: | 1. Forschungszentrum Karlsruhe, Institut für Nukleare Entsorgungstechnik, D-76021 Karlsruhe, Germany;2. Umweltforschungszentrum Leipzig-Halle GmbH, D-04301 Leipzig, Germany;3. GSF-Institute of Hydrology, D-85758 Neuherberg, Germany;1. Arts et Métiers ParisTech, I2M, UMR 5295, F-33400 Talence, France;2. Bordeaux INP, I2M, UMR 5295, F-33400 Talence, France;1. Brown University, Providence, RI 02912, USA;2. CEA/CESTA, 15 Avenue des Sablières, CS 6001, 33 116 Le Barp Cedex, France;3. Institüt für Mathematik, Universität Zürich, CH-8057 Zürich, Switzerland;1. Department of Civil Engineering, Sharif University of Technology, PO Box 11155-9313, Tehran, Iran;2. National Centre for Groundwater Research & Training and School of the Environment, Flinders University, GPO Box 2100, Adelaide, South Australia 5001, Australia;1. School of Naval Architecture and Civil Engineering, Shanghai Jiao Tong University, Shanghai 200240, China;2. College of Urban Railway Transportation, Shanghai University of Engineering Science, Shanghai 201620, China;3. Department of Civil Engineering, Shanghai University, Shanghai 200444, China;1. Department of Civil Engineering & Hydrotech Research Institute, National Taiwan University, Taiwan;2. Moldex 3D, Core Tech System Co., Ltd, Taiwan;3. Department of Civil Engineering, National Taiwan University, Taiwan;4. School of Mathematics and Natural Sciences, University of Southern Mississippi, USA;1. Key Laboratory of Advanced Textile Materials and Manufacturing Technology Ministry of Education, Zhejiang Sci-Tech University, Hangzhou, Zhejiang 310018, China;2. Department of Functional Machinery and Mechanics, Shinshu University, 3-15-1 Tokida, Ueda 386-8576, Japan |
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| Abstract: | The origin and mobility of humic colloids in the Gorleben aquifer system have been examined. For this purpose, the distribution of humic colloids and relevant hydrological and geochemical parameters were examined. An investigation area was selected where sediments have been disturbed by salt dome uplift and glacial events. It is shown that, on a local scale, considerable groundwater movement and intermixing takes place from the surface down to the salt dome. Consequently no effective separation of groundwater layers occurs. Two different humic colloid sources are identified: influx from the humus horizon with recharge water and continuous in situ generation via mineralization of sedimentary organic carbon (SOC). The in situ generation leads to groundwaters with humic colloid concentrations approaching 0.4 g/L, compared to concentrations of less than 0.005 g/L in recharge waters. Young groundwaters (no 14C decay detected) between approximately 50 and 200 m depth exhibit these highly elevated humic colloid concentrations. At greater depth, salt brines are found with low humic colloid concentrations. This can be attributed to precipitation of humic acid and/or hampering of the in situ generation process due to the high salt content. There is no indication of retention or decomposition of humic colloids. The fate of in situ generated humic colloids cannot be precisely evaluated due to analytical limitations and insufficient understanding of groundwater movement. |
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