Abstract
Distribution coefficients between sample soil and water were determined for 17 soil samples and 9 radionuclides by batch and/or column method. Those experimental data were analyzed on some environmental factors, such as macro ionic component in liquid phase, percolation rate of water through soil column, saturation degree of the soil pore with water, cation exchange capacity of soil and so on, which might have large influence on a variation of kd. Some instructive results were obtained such as: (1) Relative magnitude of kd for 90Sr, 137Cs and 60Co does not depend on the sample soil. kdos is the largest among 3 nuclides and is followed by kdco. kdSr is the smallest. (2) kd for calcium rich soil might be estimated mainly based on Ca+Mg concentration in water phase, and kd for calcium poor soil based on pH in water phase. (3) Positive correlation is observed between kd of 90Sr and cation exchange capacity of soil. (4) kd for unsaturated soil with water are observed to be larger than kd determined for saturated soil with water. (5) 90Y, 110mAg and 59Fe among 9 nuclides used in this work might be stable in non-ionic form in water.
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