Monitoring of praseodymium(III) ions in aqueous solutions, soil and sediment samples by a PVC membrane sensor based on a furan-triazole derivative

Abstract

Recebido em 26/2/12; aceito em 7/7/12; publicado na web em 21/9/12 A furan-triazole derivative has been explored as an ionophore for preparation of a highly selective Pr(III) membrane sensor. The proposed sensor exhibits a Nernstian response for Pr(III) activity over a wide concentration range with a detection limit of 5.2×10 -8 M. Its response is independent of pH of the solution in the range 3.0-8.8 and offers the advantages of fast response time. To investigate the analytical applicability of the sensor, it was applied successfully as an indicator electrode in potentiometric titration of Pr(III) solution and also in the direct and indirect determination of trace Pr(III) ions in some samples.

Development of a procedure for spectrophotometric determination of Pr(III) from rare earth elements (REEs) concentrate

“…It forms the core of carbon arc lights for the motion picture industry and didymium glass to make certain types of welders and glass blowers goggles (with yellow colour). It is added to fiber optic cables as a doping agent where it acts as a signal amplifier [14].…”

Plasticizer for Liquid Polymeric Membrane of Ion Selective Electrode Based on Thiazole Derivatives as Ionophore

“…Four sensors have been prepared using same ratio and ionophore for the membrane, each sensor gives a different response behavior. The typical composition of solvent polymeric membranes is 30-33% (w/w) PVC and 60-66% of a plasticizer [1,4]. The sensitivity and selectivity of the ion selective electrodes depend significantly on the membrane compositions [7].…”

“…When a plasticizer is added, the free volume of the polymeric chain is expanded, making penetration of an analyte easier, increasing its interaction with the sensing phase [8]. The nature of plasticizer affects the response characteristics of the electrode, due to its influence on the dielectric constant of the membrane phase, the mobility of ionophore molecules and the state of the ligand [4].…”

“…The ideal plasticizer should have the following properties: softens the PVC membrane, solubilizes the ionophore, insoluble in water, and is inert with respect to ion exchange [3]. The plasticizers must have plasticity or fluidity properties to be physically compatible with the polymer, so as to give a homogeneous organic phase [4]. In contrast, the plasticizer must have solubility properties to be compatible with the chosen ionophore.…”