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Predictions of in situ solid/liquid distribution of radiocaesium in soils

Previous work has demonstrated that plant uptake of radiocaesium (RCs) is related to the activity concentration of RCs in soil solution, which is linked to the soil/soil solution distribution coefficient, K D. The solid–liquid distribution of RCs is generally studied in soil suspensions in the labor...

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Published in:Journal of environmental radioactivity 2002, Vol.63 (1), p.35-47
Main Authors: Sanchez, A.L., Smolders, E., Van den Brande, K., Merckx, R., Wright, S.M., Naylor, C.
Format: Article
Language:English
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Summary:Previous work has demonstrated that plant uptake of radiocaesium (RCs) is related to the activity concentration of RCs in soil solution, which is linked to the soil/soil solution distribution coefficient, K D. The solid–liquid distribution of RCs is generally studied in soil suspensions in the laboratory and there are few reported measurements for in situ soil solutions. From a data set of 53 different soils (contaminated with either 134CsCl or 137CsCl) used in pot trials to investigate grass uptake of RCs, we analysed the variation of in situ K D with measured soil properties. The soils differed widely in % clay (0.5–58%), organic matter content (1.9–96%) and pH (2.4–7.0, CaCl 2). The K D varied between 29 and 375,000 L kg –1 (median 1460 L kg –1). Stepwise multiple regression analysis showed a significant correlation between the log K D and pH (p
ISSN:0265-931X
1879-1700
DOI:10.1016/S0265-931X(02)00013-9