Ion Transfer Across Membrane Stabilized Liquid Liquid Interface. Application to Enzymatic Determination of Urea
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Date
2000-06
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Addis Ababa Universty
Abstract
Ion transfer across the membrane-stabilized water/nitrobenzene interface has been
investigated. The response behavior of the sensor has been studied employing
different hydrophilic dialysis membranes and membrane filters. The influence of the
membrane on the transfer of different cations and anions was investigated.
Theoretical equations have been obtained for current step excitation and were
compared with experimental results. The influence of supporting electrolyte
concentration in the aqueous phase has been also investigated and it was observed
that as the concentration of supporting electrolyte increases the diffusion through the
membrane became faster.
The diffusion coefficients evaluated by employing different membrane materials were
in the order of 10.6 and 107 Cm' Is. The results obtained indicate higher diffusion
coefficients for cations over anions.
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Keywords
Ion transfer across the membrane-stabilized Liquid