Lead(II)-selective Polymeric Electrode Using a Schiff Base Complex of N,N'-Bis-thiophene-2-ylmethylene-ethane-1,2-diamine as an Ion Carrier

We prepared lead ion-selective PVC membranes that were based on N,N'-bis-thiophene-2-ylmethylene-ethane-1,2-diamine as a membrane carrier. The membrane electrode has a linear dynamic range between 1.0 × 105 and 1.0 × 101 M with a Nernstian slope of 29.79 mV per decade, and its detection limit was 2.04 × 106 M at room temperature. The potentiometric response is independent of the pH of the solution in the pH range of 5-7. The proposed electrode revealed good selectivity and response for Pb2+ over a wide variety of other metal ions in pH 5.0 buffer solutions, and there was good reproducibility of the base line on the subsequent measurements. The membrane electrode has a relatively fast response time, satisfactory reproducibility and a relatively long life time. KCI Citation Count: 16