ELECTROCHEMISTRY OF CAPILLARY SYSTEMS WITH NARROW PORES III - ELECTRICAL-CONDUCTIVITY

The extension of the Teorell-Meyer-Sievers theory of the dialysis pote ntial to a general theory of capillary systems with narrow pores outli ned in Part I of this series of publications has been applied to elect roosmotic phenomena in Part II. In this Part, the electrical conductiv ity, including the electrical convection conductivity, will be treated in terms of the new theory. The corresponding equations already refer red to in Part I are derived. In addition, results of measurements of the electrical conductivity of collodion membranes with graded porosit y and graded electrochemical activity in aqueous KCl solutions of diff erent concentrations are reported. They are used to test the new theor y. It will be shown that it is possible to determine the fixed ion con centration A of the membranes by using electrical conductivity data. T he theory predicts that the value of A should be identical with the 's electivity constant' of the Meyer-Sievers theory of the dialysis poten tial. This prediction will be checked in Part IV of this series of con tributions. (C) 1998 Published by Elsevier Science B.V. All rights res erved.