Beschreibung:
<jats:p> The diffusion coefficient of SO<jats:sub>2</jats:sub> and acetonitrile in Nafion perfluorinated ion exchange membranes have been determined from chromatographic measurements of SO<jats:sub>2</jats:sub> concentration and the isotopic ratios in acetonitrile solutions. The diffusion coefficients vary with residual water content and attain values about one fifth those reported for water-saturated membranes falling in the range 1–2 × 10<jats:sup>−7</jats:sup> cm<jats:sup>2</jats:sup> s<jats:sup>−1</jats:sup>. Values obtained for Teflon reinforced material indicates diffusion takes place over an effective surface more than twice the optically open area. </jats:p>