In estuarine environments there are important spatial and temporal changes in both salt and suspended load concentrations.
An experimental procedure have been developed to produce kinetic parameters being representative of the natural environment
studied, and we have investigated the effect of salinity and suspended load concentration to the kinetics of the uptake. These
results are encouraged by recent advances in environmental modelling concerning to radionuclide dispersion in aquatic natural
systems and involving non-equilibrium processes. Experiments are carried out with unfiltered water samples from the Odiel
estuary (Southwest of Spain), with133Ba tracer to illustrate experimental procedures.