Electrochimica Acta, Vol.41, No.9, 1491-1493, 1996
Measurements of Diffusion-Coefficients of the Neutral Ionophores in Plasticized PVC Membranes Using Small Amplitude AC/DC Techniques
A technique based on small amplitude ac impedance/dc polarization is introduced to determine the diffusion coefficients of neutral ligands (ionophores) in plasticized PVC membranes used for ion selective electrodes. The diffusion coefficient of ETH129 in a 33 wt.% PVC-NPOE membrane was measured to be similar to 1.5 x 10(-8) cm(2) s(-1) using this technique.