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Scavenging Properties of Inorganic Particles Toward Heavy Elements

The particulate (including colloidal) fraction of natural solutions may be an efficient vector for the dissemination of heavy elements in the geosphere, in particular the radioelements originating from a radioactive waste repository. The scavenging properties of inorganic fine particles (silica, muscovite) toward heavy elements (actinides and lanthanides) were studied by two different complementary approaches, namely sorption experiments either with fine particle suspensions or with mineral monoliths considered as macroscopic surfaces of fine particles. In the former case, the partition coefficient was determined by solution analysis with radiochemical techniques, and in the latter case, the amount of elements fixed on mineral surfaces was evaluated by Rutherford Backscattering Spectrometry (RBS). In both cases, well-defined model systems representative of colloids found in natural waters (silica, alumino-silicate) were used. Results are presented and discussed as a function of pH, nature of particles and surfaces as well as speciation of elements.