Differential pulse voltammetry for ion transfer at liquid membranes with two polarized interfaces.
A simple analytical expression for the response of the double-pulse technique differential pulse voltammetry (DPV) corresponding to ion transfer processes in systems with two liquid/liquid polarizable interfaces has been deduced. This expression predicts lower and wider curves than those obtained with a membrane system with a single polarizable interface. Moreover, the peak potential of these systems is shifted 13 mV from the half-wave membrane potential. We have applied this expression to study the ion transfer of drugs with different pharmacological activities (verapamil, clomipramine, tacrine, and imipramine), at a solvent polymeric membrane ion sensor.
Molina
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A
Departamento de Química Física, Facultad de Química, Universidad de Murcia, 30100 Murcia, Spain. amolina@um.es
Serna
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C
Ortuño
J A
JA
Gonzalez
J
J
Torralba
E
E
Gil
A
A