239,240Pu, 241Am and 232Th in lakes: The effects of seasonal anoxia |
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| Institution: | 1. State Key Laboratory Cultivation Base for Nonmetal Composites and Functional Materials, Southwest University of Science and Technology, Mianyang 621010, PR China;2. College of Materials Science and Engineering, Southwest University of Science and Technology, Mianyang 621010, PR China;1. School of Earth and Environment, University of Leeds, Leeds LS2 9JT, UK;2. Department of Physical Chemistry, University of Santiago de Compostela, Avenida de las Ciencias s/n, 15782 Santiago de Compostela, Spain;3. National Nuclear Laboratory Ltd., Chadwick House, Warrington, Cheshire WA3 6AE, UK;4. School of Chemical and Process Engineering, University of Leeds, Leeds LS2 9JT, UK;1. Centro de Estudios Hidro-Ambientales (CENEHA), Facultad de Ingeniería y Ciencias Hídricas (FICH), Universidad Nacional del Litoral (UNL), Ciudad Universitaria, Ruta Nacional Nº 168 – Km 472,4, 3000, Santa Fe, Argentina;2. Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Argentina;1. Georgia State University, Department of Geosciences, Atlanta, GA 30303, United States;2. Illinois State Natural History Survey, Prairie Research Institute, Champaign, IL 61820, United States;3. Chemical Sciences Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831, United States;4. Georgia State University, Department of Chemistry, Atlanta, GA 30303, United States |
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| Abstract: | A pond which undergoes seasonal anoxia as a result of thermal stratification was studied to assess the possible release of actinide elements from anoxic sediments to the pond waters. Concentration profiles of 239,240Pu, 241Am, 232Th, iron and manganese in the water column show significant increases in concentration for all elements in the anoxic deep waters. However, calculated total inventories of the elements in the pond water indicate no apparent input of actinide elements to the system during summer stratification. Similar inventory calculations for 239,240Pu in a previously studied system support the results of this study. The lack of a significant increase in pond inventories of actinide elements coupled with a lack of correspondence of concentration profiles of the actinide elements to the seasonal Fe and Mn concentrations profiles argues that the increases in concentrations observed for these elements in anoxic bottom waters result from the downward transport of material already in the water column rather than release from the sediments. |
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