Abstract
Considerable efforts have been devoted to experimental studies on the sorption kinetics and the transport of radionuclides in porous media. Motivations: their environmental impact, selection of materials for nuclear waste deposits and pollution in underground aquifers. The present study investigates aspects of non-conservative radionuclide’s dispersion and sorption kinetics in natural sediments. Waters and sediments were sampled in two different environments. It was investigated the uptake kinetics of 133 Ba by sediments in aqueous suspensions and cores. Samples from the upper most layer (estuary) reveals an important and fast uptake by sediment cores. The depth distribution could be reasonably described by means of an effective diffusion coefficient. The uptake kinetics by suspended sediments could be described by a compartmental kinetic model, but the effective diffusion model (based in a distribution coefficient) shows serious limitations to describe the profiles along the time.
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