Interaction Study of a new Bis-Bidentate Schiff's Base with some Metal Ions and its Application in Fabrication of Sm(III) Potentiometric Membrane Sensor

• Published in: International journal of electrochemical science 2008-12, Vol.3 (12), p.1559-1573
• Main Authors: Ganjali, Mohammad Reza, Tavakoli, Mehdi, Faridbod, Farnoush, Riahi, Siavash, Norouzi, Parviz, Salavati-Niassari, Masoud
• Format: Article
• Language: English
• Subjects: complexation; membrane; potentiometry; samarium; sensor
• ISSN: 1452-3981; 1452-3981
• DOI: 10.1016/S1452-3981(23)15539-8

Theoretical and computational models are capable of reliably predicting ligand selectivity toward variety of metal ions which can be valuable tools for the advancement of practical works. According to the theoretical calculations and conductance studies, complexation of a new bis-bidentate schiff's base, 2-[{{4-[{3-{[(z)-1-(2-hydroxy phenyl) methylidene] amino}phenyl)oxy]phenyl}imino) methyl]-1- benzenol (APOPIB) with some mono, di and trivalent metal ions was investigated. Since APOPIB was able to form a selective complex with Sm(III) ion (Kf=5.23± 0.24), it was applied as a sensing material in a poly vinyl chloride (PVC) membrane sensor for determination of Sm(III) ions. This sensor with the membrane composition of 30% PVC, 62% nitrobenzene (NB), 5% ionophore and 3% sodium tetraphenylborate (NaTPB), exhibits a rapid and good Nernstian response toward Sm(III) ions in the range of 10-6 to 10-1 mol L-1 with a slope of 19.3±0.2 mV per decade and a detection limit of 6.1×10-7 mol L-1. The sensor can be used in a pH range from 5.5 to 9.5, the potential response of the sensor remained constant despite the pH fluctuations. The proposed sensor was evaluated by determining the samarium ion concentration at using a Certified Reference Material (CRM).