Counting of adsorption sites by measurement of transport properties in a dehydrated bentonite-sodium [Dénombrement des sites d'adsorption par mesure des propriétés de transport dans une bentonite-sodium déshydratée]

The presence of negative charges on the surface as well as specific large surfaces,that these argillaceous materials develop,their confer an important properties of trapping of micropolluants contained in water. a conduction model in these disorganized solids was developed to count the number of adsorption sites,thanks to the introduction of the energetic parameter of the charge carriers. the application of an alternating electric field do appears a polarized conductivity and the current transport is due at a porters between these sites,where the electrical balance is locally disturbed,thereof constitute privileged adsorption centers; the implemented energies are in good agreement with theory.