PVC Membrane Potentiometric Sensor based on (E)-2-Acetyl-3-(butyl-amino)-N-phenyl buten-2-thioamide for Selective Determination of Iron (II)

In this paper, the construction and performance characteristics of novel PVC membrane Fe(II) ion selective electrodes based on (E)-2-acetyl-3-(butyl amino)-N-phenyl buten-2-thioamide is described. The electrode exhibits linear responses with Nernstian slope of 30.0±0.2 mVdecade?1 of activity within the Fe(II) ion concentration range of 3.5×10?7 to 1.2×10?2 M. This sensor is applicable in a pH range of 5.0-7.0. The lower detection limit is 1.6×10?7 M. It has a response time less than 10 s and can be used practically for a period of at least 2 months without any measurable divergence in results. The isothermal temperature coefficient of the sensor was assessed 1.24×10?3 V/oC. The electrode showed excellent selectivity towards Fe(II) ion over a wide range of alkali, alkaline earth, and transition metals ions. It was successfully applied for the direct determination of Fe(II) ions in real samples.