Cu(Ii)-All Solid State Sensor Ion Selective Electrode (Ass-Ise) With a Nano-Molar Detection Limit and Its Use for the Analysis of Waste Water Samples



Ganjali MR^{1, 2} ; Rezapour M³ ; Piralihamedani M^{4, 5} ; Rashedi H⁶
Source: International Journal of Electrochemical Science Published:2015

Abstract

The present work focuses on the development of an all-solid-state electrode (ASSE) for the determination of Cu2+ ions in complex matrices. The ASSE is made of a layer of a conductive graphite-epoxy resin, coated on a copper wire. The composite layer is further covered with a Cu2+ selective PVC membrane composed of 33% PVC as the base material, 58% nitrobenzene (NB) as a plasticizing solvent, 3% of potassium tetrakis (p-chlorophenyl) borate (KpClTPB) which acts as an ionic additive, and 6% of a copper selective ionophore (L). The ASSE was found to have a Nernstian potential response of 29.4±0.4 mV/decade over a dynamic linear range from 1.0×10-8 M to 1.0×10-3 M of Cu2+ and the detection limit of the sensing device was also evaluated to be 2.4×10-9 mol L-1. The selectivity of the sensor towards the target ion in the presence of different commonly occurring interfering ions was found to be very good, and to test its applicability in the analysis of real samples with complex matrices the ASSE was applied for the determination of Cu2+ in waste water samples of copper electroplating, and the results were found to be very satisfactory. © 2015 The Authors.