Cu(II) Ion- Selective Membrane Electrode Based on bis(N-salicylidene-3,3'-diamino diphenyl) sulfone

In order to study the Cu(II) ion selective electrode, an optimized membrane was prepared by mixing of 30 mg of PVC powdered, 5 mg of considered ionophore, 60 mg of plasticizer and 5 mg of additive. The sensor showed a near Nernstian response for Cu(II) ions over a concentration range from 1.0×0-6 –1.0×0-2 M with a slope of 28.90.5 mV per concentration decade with a working pH range of 3.5-6.3. The limit of detection was 1.010-6 M. The response time of the electrode is about 15s and can be used for more than 2 month without any divergence in potential.    The proposed sensor showed fairly a good discriminating ability towards Cu(II) ion in comparison to other ions. The practical application of the electrode was tested by using it as an indicator electrode to determine the end point in the potentiometric titration of Cu(II) with EDTA solution.