Design and construction of a new potentiometric sensor for the determination of Cd2+ ions

A new cadmium ion selective electrode based on 2,6-bis (methoxy-6-methyl iminophenol) pyridine (L) for ultra trace Cd2+ ion determination by potentiometric method was prepared. The interaction between the ligand with Cd2+ ions and other metal ions was investigated through conductivity studies confirming the selectivity for Cd2+ ions. The best combination of electrode percentages is 5% ligand, 30% PVC, 63% NPOE and 2% KTpClPB. In the linear 1.0×10-4 to 1.0×10-8 molar range, this sensor shows a good Nernstian gradient of 29.6 mV for every ten units of concentration change and It has a detection limit wase 1.0×10-9 M. the proposed sensor has a response time of approximately 35 seconds. Potentiometric response of the electrode in the pH range of 4.5 to 9.5 showed independent changes in the concentration of H+ ions

Keywords:

Potentiometric , Sensor , Cadmium , electrode ion selective