Volume 37, Number C1, February 2002ECORAD 2001: The Radioecology - Ecotoxicology of Continental and Estuatine Environments
|Page(s)||C1-303 - C1-307|
|Published online||14 October 2009|
Towards a more comprehensive modelling of the behaviour of transuranic elements in agricultural soils: Experimental procedure for the study of the sorption/desorption parameters and speciation of transuranic actinides in the rhizosphere
Institut de Protection et de Sûreté Nucléaire, Laboratoire de Radioécologie Expérimentale, CE Cadarache, BP. 1, 13108 Saint-Paul-lez-Durance cedex, France
2 Centre de Pédologie Biologique, UPR 6831 du CNRS associée à l'Université Henri Poincaré-Nancy I, 17 rue Notre-Dame des Pauvres, BP. 5, 54501 Vandœuvre-lès-Nancy cedex, France
The present paper describes the experimental on-going program on the biogeochemical behaviour of americium and neptunium in the rhizosphere of agricultural soils. Investigation is made by column experiments under close-to-natural conditions, supported by complementary batch experiments. Columns filled with 2mm-sieved soil, contaminated with 241Am or 237Np, are leached by soil solutions of varying compositions including citric acid and/or glucose. The outlet solution is analyzed (pH, Eh, conductivity, major ions, low molecular weight organic acids, radionuclides) and ultrafiltration is used to determine the relation between particle size and α activity. The objective of the study is to ascertain quantitative information on the effects of root exudates, of the physico-chemical parameters of the soil solution as well as the potential role of microorganisms, on the sorption/desorption processes and the speciation in solution 241Am and 237Np.
© EDP Sciences, 2002
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