A method for determination of the molecular species diffusion coefficients in solution is proposed. This method is adapted from Stokes one and involves the unidirectional diffusion through a microporous hydrophilic membrane. It is applied to a series of near size aminated compounds. The results are compared to literature. The good agreement allows to estimate with a good accuracy the ethylenediamine (EDA) diffusion coefficient. The latter, witch is unknown in the literature, is necessary to our study on EDA "Transport-Reaction" in ion-exchange membranes.
C. Ahmed, S. Roudesli