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ELECTRICAL CONDUCTANCE STUDIES ON ION EXCHANGE MEMBRANE USING CONTACT-DIFFERENCE METHOD.pdf
Electrochimica Acta 231 (2017) 453–459
Contents lists available at ScienceDirect
Electrochimica Acta
journal homepage: /locate/electacta
ELECTRICAL CONDUCTANCE STUDIES ON ION EXCHANGE MEMBRANE USING CONTACT-DIFFERENCE METHOD
Tolera Seda Badessaa,*, Vladimir Alexeevich Shaposhnikb
a Department of Chemistry, College of Natural Science, Arba Minch University, P.O.Box 21, Arba Minch, Ethiopia
b Department of Analytical Chemistry, Faculty of Ehemistry, Voronezh State University, Universitetskaya Sq. 1, 394006 Voronezh, Russia
ARTICLE INFO
Article history: Received 6 October 2016 Received in revised form 18 February 2017 Accepted 18 February 2017 Available online 21 February 2017
Keywords: Electrical conductivity Ion-exchange membrane Contact-Difference Method Activation energy
ABSTRACT
Comparisons of contact-difference and contact methods for the measurement of membrane conductivity were made. It was found that the conductivity of the ion exchange membrane at in?nite dilution can be accurately measured only by contact-difference method (CDM) in equilibrium with highly diluted electrolyte solutions. The dependence of the measured speci?c electrical conductivity and impedance of ion exchange membranes on the concentration, temperature, charges of counter ions and frequency of an electric ?eld was discussed. Good agreement was found between the experimentally determined activation energy of ion-exchange membranes in the form of ions of different charges and the calculated activation energy using ab initio quantum chemical method.
? 2017 Elsevier Ltd. All rights reserved.
1. Introduction
Ion exchangers, in the forms of membranes and granules are conductors of the second kind. In extremely dilute solutions, ion exchange membranes contain only one kind of mobile ions (counter ions) and are unipolar conductors of electricity. However, in solutions of medium and high concentrations, non-exchangeable adsorption of electrolyte takes place, and the ion exchanger becomes a complicat
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