Highly selective Cu(II) PVC membrane electrode based on 3,6,9,14-tetrathiabicyclo[9.2.1]tetradeca-11,13-diene as a suitable neutral ionophore

A new PVC membrane electrode that is highly selective to Cu(II) ions was prepared by using 3,6, 9,14-tetrathiabicyclo[9.2.1]tetradeca-11,13-diene as a suitable neutral carrier. The electrode exhibits a Nernstian slope of 28±1 mV per decade at 25 °C for Cu2+ ions over a wide concentration range (6.3×10−7 to 2.5×10−1 M). It has a response time of<10 s and a detection limit of 3.2×10−7 M. The proposed electrode revealed good selectivities over a wide variety of other cations including alkali, alkaline earth and transition metal ions and could be used for at least 2 months without any divergence in potential. It was applied to the direct determination and potentiometric titration of copper ions.