A Comparative Study of Linked 2, 2 '-Dipyridylamine Ligand System as an Ion Selective Electrode for Ag (I) Ions

作者：Mittal Susheel K^*; Kumar Pawan; Kumar Ashok S K; Lindoy Leonard F

来源：International Journal of Electrochemical Science, 2010, 5(12): 1984-1995.

• 2, 2 '-dipyridylamine
• potentiometry
• selectivity
• stability constant
• Ag (I) ions

The linked 2, 2'-dipyridylamine derivatives have been explored as neutral carrier ionophores for preparing poly (vinyl chloride) based electrodes selective to Ag(I) ions. Based on the stability constants determined by sandwich membrane method and the energy minimization studies using CAChe software, the ionophore was found selective for Ag (I) ions. Different compositions of the membrane were studied. The best performance was found with the electrode composition (w/w) ionophore (3%): PVC (33%): o-NPOE (64%). This electrode exhibits Nernstian response with a slope of 59mV/decade of activity in the concentration range 5.5x10(-6) - 1.0x10(-1)M of Ag (I). The electrode shows satisfactory performance over a pH range of 2.0 - 9.5, with a fast response time of 14s. Response of the electrode was highly selective to Ag(I) ions over a number of uni-, di- and trivalent metal cations. Also, the electrode has been used successfully as an indicator electrode in potentiometric titrations of Ag (I) ions

• 出版日期2010-12