All Solid State (Ass) Polymeric Membrane Sensor (Pms) for the Monitoring of Nanomolar Nickel Concentration



Ganjali MR^{1, 2} ; Alahdadi I³ ; Aghazadeh M⁴ ; Pourbasheer E⁵
Source: International Journal of Electrochemical Science Published:2015

Abstract

A nickel(II) selective all-solid-state PVC membrane sensor (ASS-PMS) has been designed and constructed for the monitoring of nanomolar nickel(II) concentrations in various samples. The applicability of the sensor to real samples was proved through its use for the analysis of the target ion in waste water samples. The all solid state support and transducer was build through coating a nickel wire with a composite of graphite powder and an epoxy resin, and next it was coated with a nickel selective PVC membrane, with the optimal composition of 33% of PVC, 57% of Nitrobenzene, 2% RTIL (1-n-butyl-3-methylimidazolium hexafluorophosphate), 3% of KpClTPB, and 5% of ionophore L. The potential response of the ASS-PMS change with the concentration of the target ion at a slope of 29.5±0.3 mV/decade, which is indicative of a Nernstian behavior, and was linear in the concentration range of 1.0×10-8 to 1.0×10-3 mol L-1 of the nickel(II), reaching a lower detection limit as low as 5.0×10-9 mol L-1. The response of the ASS-PMS was found to be almost independent from interference from different conventional ionic species. The ASS-PMS was successfully applied to the potentiometric determination of nickel(II) concentrations in ions electroplating waste water samples. © 2015 The Authors.