A Novel Europium(III) Sensor Based on 4E-4-(2-

Solution studies revealed that 4E-4-(2-phenylviazenyl)-2-((E)-(2-aminoethylimino)methyl)phenol (PMP) has a special interaction with europium ion respect with other lanthanide metal ions. PMP was evaluated as a neutral ion carrier in construction of a europium PVC-based membrane sensor. The proposed sensor exhibits a near-Nernstian response of 18.8±0.2 mV per decade of europium activity in the range of 4.0×10-7-1.0×10-2 M with a detection limit of 1.5×10-7 M. The membrane with a composition containing 4 % PMP as ion carrier, 3 % potassium tetrakis (4-chlorophenyl) borate (KTpClPB) as an anionic excluder, 60 % o-nitrophenyloctylether (NPOE) as solvent mediator and 33% poly(vinyl chloride) (PVC) showed the best potential response. Selectivity of the proposed europium sensor was evaluated in the presence of a number of common and lanthanide ions and the obtained results showed that the selectivity coefficients are in the range of 7.5×10-6-2.4× 10-4. The potential response of the europium sensor is independent to pH in the range of 3.5-8.0