Volume 37, Number C1, February 2002ECORAD 2001: The Radioecology - Ecotoxicology of Continental and Estuatine Environments
|Page(s)||C1-265 - C1-270|
|Published online||14 October 2009|
Effect of soil K-status and bentonite additions on radiocaesium transfer
SCK-CEN, Radiation Protection Department, Radioecology Section,
Boeretang 200, 2400 Mol, Belgium
2 Katholieke Universiteit Leuven, Laboratory of Soil Fertility & Soil Biology, Kardinaal Mercierlaan 92, 3001 Heverlee, Belgium
The influence of bentonite additions and soil K status on radiocaesium transfer to ryegrass was investigated in a potted soil experiment. A sandy soil was contaminated with 134Cs and amended with K salts (0-97 mM kg-1) and K bentonite (0-2 %). After 4 weeks incubation of the mixtures, ryegrass was grown for 18 weeks and trimmed at 7 occasions. During subsequent harvests, the radiocaesium transfer factor (TF) decreased up to 2.7 fold in soils amended with more than 0.25 % bentonite whereas they increased 3.0 to 14.4 fold in unamended soils or at the lowest bentonite application (0.25 %). Different trends are related to the formation of specific sorption sites and the depletion in soil K which was more pronounced in soils with < 0.25 % K-bentonite added. Radiocaesium Interception Potential (RIP) and percentage K bentonite added were positively correlated. 10-40 fold higher RIP values at 1 to 2 % supply compared to unamended soils were obtained. Built-up of RIP following subsequent cycles of partial drying and rewetting during plant growth is reflected in a loss in exchangeable K and the quantitative reduction of the TF. The potential role of K-bentonite as countermeasure for Cs contaminated soils is discussed.
© EDP Sciences, 2002
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