ESTIMATION OF THE DIFFUSION-COEFFICIENT AND SOLUBILITY FOR A GAS DIFFUSING THROUGH A MEMBRANE

Analysis of the data obtained by the electrochemical monitoring technique for diffusion of a gas through a membrane is considered. It is shown that combining a numerical method with a nonlinear parameter estimation technique provides a means to determine values for the diffusion coefficient and the solubility of the diffusing gas. It is shown that better accuracy can be obtained for the diffusion coefficient and solubility of this gas by using the method presented and all experimental data rather than only part of the data, as has often been done in the past. © 1990, The Electrochemical Society, Inc. All rights reserved.