Non-ideality effect for self-diffusion coefficient of lead cryptate by normal pulse polarography

Abstract

Self-diffusion coefficients of lead cryptates have been determined using a polarographic technique. The cryptands are sensible models of heavy and large particles undergoing Brownian motion. Self-diffusion coefficient measurements are in good agreement with mean spherical approximation transport calculations. Polarographic measurements show that the electroreduction of lead cryptate is an irreversible process. Hence, the standard rate constant k° of the couple Pb 2+/(Pb) Hg can be deduced from the equilibrium constant of the complexation.