Maes, Eric
[UCL]
Delvaux, Bruno
[UCL]
Iserentant, Anne
[UCL]
Herbauts, J
The magnitude of radiocaesium fixation by micaceous clay minerals is affected by their transformation, which depends on weathering in soil. The net retention of radiocaesium traces was quantified by sorption-desorption experiments in the Various horizons of four sandy soils forming an acid brown earth-podzol weathering sequence derived from sandy sediments and characterized by marked changes in mineral composition. The features of the 2:1 minerals of the four soils, resulting from an aluminization process in depth and a desaluminization process towards the surface, had a strong influence on Cs+ fixation. Beneath the desaluminization front, which deepens from the acid brown earth to the podzol, hydroxy interlayered vermiculite was dominant and the Cs-137(+) fixation was the weakest. At the desaluminization front depth, vermiculite was responsible for the strongest Cs-137(+) fixation. In the upper layers, smectite appeared in the podzolized soils and the Cs-137(+) fixation decreased. The magnitude in Cs+ fixation therefore appeared as a tracer of the transformation process affecting the 2:1 clay minerals in the acid brown earth-podzol weathering sequence. This magnitude was positively correlated with the vermiculite content of the studied soil materials estimated by the rubidium saturation method.
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Bibliographic reference |
Maes, Eric ; Delvaux, Bruno ; Iserentant, Anne ; Herbauts, J. Influence of the nature of clay minerals on the fixation of radiocaesium traces in an acid brown earth-podzol weathering sequence. In: European Journal of Soil Science, Vol. 50, no. 1, p. 117-125 (1999) |
Permanent URL |
http://hdl.handle.net/2078.1/44289 |