Influence of the nature of clay minerals on the fixation of radiocaesium traces in an acid brown earth-podzol weathering sequence
(1999) European Journal of Soil Science — Vol. 50, n° 1, p. 117-125 (1999)
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- Abstract
- 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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Maes, E., Delvaux, B., Iserentant, A., & Herbauts, J. (1999). Influence of the nature of clay minerals on the fixation of radiocaesium traces in an acid brown earth-podzol weathering sequence. European Journal of Soil Science, 50(1), 117-125. https://doi.org/10.1046/j.1365-2389.1999.00224.x (Original work published 1999)