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  • 1 Universitat de Barcelona Departament de Química Analítica Av. Diagonal 647 E-08028 Barcelona Spain
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A sequential extraction scheme which indicates the role of organic matter in radionuclide retention was applied to two types of Mediterranean soil (sandy-loam and sandy), with low percentages of organic matter and with different contents of clay mineral, which had been previously contaminated with a radioactive aerosol, containing85Sr,134Cs and110mAg. Different distributions were obtained for the three radionuclides, depending on the type of soil.85Sr was the most available radionuclide for both types of soil, showing significant binding to organic matter in sandy-loam soil.134Cs was the most retained radionuclide: for low-organic-matter soils, its availability seemed to depend on clay mineral content.110mAg associated with available organic sites showed a positive correlation with organic matter content.