Abstract
This study aimed to elucidate the dynamic features of an apparent solid–liquid distribution coefficient (Kd(a)) of radiocesium that regulates radiocesium’s dissolved concentration and affects its transfer from soil to crops. According to our analysis of data from the literature and our use of a theoretical formulation that considers the competitive adsorption of Cs+ with K+ and NH4+ on a frayed edge site (FES), the solid-phase radiocesium interception potential (RIP) and liquid-phase water chemistry of dissolved K+ and NH4+ concentrations or electrical conductivity (EC) are key factors in controlling Kd(a) for radiocesium and stable cesium in different soil and water environments. The basic concept of the formulation was applicable independent of the radiocesium source (atmospheric nuclear tests and different nuclear power station accidents) and the time elapsed from its deposition although Kd(a) values for stable cesium were up to several times higher than those for radiocesium. The regional-scale Japanese government database indicated that the Kd(a) derived from the 1 M CH3COONH4-extractable radiocesium in soil tends to increase with soil RIP. The management of crops, fertilization, irrigation water volume and quality, etc., as well as the soil RIP in the target field, should be considered when examining and deciding the most effective strategy to reduce radiocesium transfer from soil to crops.
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Acknowledgments
We are grateful to the Japanese Ministry of Agriculture, Forestry and Fisheries for providing the regional-scale database on the RIP, 1 M CH3COONH4-extractable radiocesium concentration, and basic physical and chemical properties of rice paddy soils in Fukushima Prefecture.
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Eguchi, S., Yamaguchi, N. (2022). Dynamics of Radiocesium Solid–Liquid Distribution Coefficient in Soil and Water Environments. In: Nanba, K., Konoplev, A., Wada, T. (eds) Behavior of Radionuclides in the Environment III. Springer, Singapore. https://doi.org/10.1007/978-981-16-6799-2_5
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