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.