A pore water study of plutonium in a seasonally anoxic lake |
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Authors: | Ken O Buesseler Gaboury Benoit Edward R Sholkovitz |
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Institution: | Woods Hole Oceanographic Institution, Woods Hole, Massachusetts 02543, USA |
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Abstract: | Data are presented here on the distribution of 239,240Pu in the pore waters of two cores taken from a seasonally anoxic lake. The pore water 239,240Pu profile exhibits a subsurface activity maximum of 230 ± 30 μBqkg?1 in the 3–6 cm interval in June, as compared to an activity of 5 ± 3 μBqkg?1 in the overlying water. The pore water 239,240Pu profile in June follows the solid phase distribution pattern of 239,240Pu and also the pore water distributions of Fe and Mn. Under more reducing conditions in August, pore water 239,240Pu activities drop off to undetectable levels at all depths. This rapid change in the pore water 239,240Pu activity reflects the dynamic nature of Pu diagenesis in these sediments. Potential diffusional fluxes of 239,240Pu into the lake's hypolimnion in June are calculated to be on the order of 2·5 μBq cm?2y?1. This flux would not be significant in altering the solid phase 239,240Pu inventory (2·8 × 104μBqcm?2). |
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