Abstract
The effects of charged (anionic and cationic) and uncharged (non-ionic) surfactants (SAS) on the polarographic waves of uranium(VI) in phosphoric acid solutions of concentrations 0·1, 1, 5 and 10 M were investigated. The non-ionic surfactant (Triton X-100) was found to cause retardation of reactions in all media, whereas the effects of a charged SAS depends upon the acid concentration. Thus, the cationic surfactant, dodecylamine perchlorate, causes enhancement of the reduction process at lower acidities, and its retardation at high acid concentrations. The anionic surfactant, sodium dodecylsulphate, shows approximately an opposite effect. The results are dis- cussed in terms of complexing action of the supporting electrolyte, the effect of the adsorbed SAS layer on the charge distribution of the double layer and the specific adsorption of phosphate anions. The efffects of SAS on the different waves were traced by following the changes that occur in the values of the different kinetic parameters in the presence of increasing amounts of these materials.
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