A novel rotated disc electrode and time lag method for characterizing mass transport in liquid-membrane systems

Authors

  • David A. Gough,

    1. Department of Applied Mechanics and Engineering Sciences, Bioengineering Group, University of California at Son Diego, La Jolla, CA 92093
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  • John K. Leypoldt

    1. Department of Applied Mechanics and Engineering Sciences, Bioengineering Group, University of California at Son Diego, La Jolla, CA 92093
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Abstract

A time lag method is described for use with a membrane-covered, rotated disc electrode that allows determination of the partitioning and diffusivity of small molecules in hydrophilic gel membranes and membrane permeability from a single measurement. This new technique takes into account the concentration boundary layer in the solution adjacent to the membrane and reaction at the electrode surface of solutes that are diffusion- or kinetic-limited. Examples are given of the use of this method for characterizing mass transfer in a commercial cellulosic membrane with oxygen, hydroquinone, ferrocyanide, and glucose as solutes.

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