Abstract
The response of two types of solid-state copper ion-selective electrodes with homogeneous membranes of CuAgSe and Cu 2- x Se has been investigated in copper(I) solutions, prepared electrochemically by in situ generation from a copper anode in chloride medium. The selectivity coefficient K pot Cu+, Cu 2+ both types of electrodes has been determined. It is 10 −5.7 for the copper selenide sensor, and 10 −6.2 for the copper silver selenide one. These values are very close to that calculated for an exchange reaction proceeding on the electrode surface. The similarity in K pot Cu+ ,Cu 2+ values for different chalcogenidebased sensors suggests a common potential-generating mechanism. High chloride concentration does not interfere with the electrode response towards Cu(I), but distorts the electrode response to Cu(II).
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