Abstract
The permselectivity of ion-exchange membranes at operation differs from that measured at “zero gradient” condition. Starting with the irreversible thermodynamics, the formula for permselectivity of the operating membrane has been derived and used to compute the permselectivity of Nafion 120 membranes against molarities of separated solutions, current density and at temperatures 25 and 60°C. The relationship between the static permselectivity as measured with the standard laboratory methods (Δ c → 0, I = 0) and permselectivity of the operating membrane at Δ c, J v, I ≠ 0 has been discussed.
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