Distribution coefficients of210Pb and210Po in laboratory and natural aquatic systems |
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| Authors: | K Wang R J Cornett |
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| Institution: | (1) Watershed Ecosystems Graduate Program, Trent University, K9J 7B8 Peterborough, Ontario, Canada;(2) AECL Research, Chalk River Laboratories, K0J 1J0 Chalk River, Ontario, Canada |
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| Abstract: | We have measured the distribution coefficient (Kd) of210Po and210Pb in laboratory systems and in natural freshwater systems. In the laboratory systems, an inverse relationship was observed between the particle concentration of sand or lake sediment, and the distribution coefficients of210Po and210Pb. The slope of the log-linearK
d
vs particle concentration relation is consistent with existingK
d-particle concentration theories. These laboratory observations are consistent with similar measurements in two lakes. TheK
d values of Po and Pb for the bottom sediment-pore water system with a high particle concentration were 10 to 100 times lower than those for dilute concentrations of particles suspended in the lake water. TheK
d of210Pb in the sediments was >104 so that the diffusive transport of210Pb has only a small influence on the interpretation of210Pb concentration-depth profiles and the210Pb dating of these sediments.This is the second of a series of papers to be published by this journal following the 20th anniversary of the first application of210Pb dating of lake sediments. Dr P. G. Appleby is guest editing. |
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| Keywords: | distribution coefficient Kd 210Pb 210Po freshwater sediment |
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