The geochemistry of uranium in pore waters from lake sediments |
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| Authors: | S. Nagao N. Yanase M. Yamamoto H. Kofuji Y. Sohrin H. Amano |
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| Affiliation: | (1) Institute for Chemistry Research, Kyoto University Gokasho, Uji, 611-0011, Japan;(2) Department of Environmental Sciences, Japan Atomic Energy Research Institute (JAERI), Tokai-mura, Naka-gun, 319-1195 Ibaraki, Japan;(3) Low Level Radioactivity Laboratory, Kanazawa University, Ishikawa, 923-1224, Japan;(4) Faculty of Technology, Kanazawa University, 2-40-20 Kodatsuno, Kanazawa, 920-8667, Japan |
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| Abstract: | The concentration of pore water uranium in six sediments from oligotrophic, mesotrophic, acidotrophic and dystrophic lakes was measured by inductively coupled plasma-mass spectrometry. Profiles of pore water U can be divided into two groups such as low (17±7 ng/l) and high concentration (69±30 ng/l). These values were 1–2 orders of magnitude higher than that of lake waters (6±4 ng/l) due to the release of U from the sediments by decomposition of organic materials. Variations in pore water U concentrations seem to relate to the differences in pore water pH, the association forms, and their contents of U in the lake sediments. |
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