Construction of Tb3+ PVC-MembraneElectrode Based on N,N’-Bis(pyrrolylmethylene)-2-aminobenzylamine

Hassan Ali Zamani,Zynab Rafati,Soraia Meghdadi

doi:10.1155/2011/263256

Hassan Ali Zamani, Zynab Rafati + Show 1 more

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https://doi.org/10.1155/2011/263256

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Abstract

In this work, we report as new Tb3+-PVC membrane sensor based onN,N’-bis(pyrrolylmethylene)- 2-aminobenzylamine (PMA) as a suitable ion carrier. Poly vinylchloride (PVC)-based membrane composed of PMA with oleic acid (OA) as anionic additives and acetophenone (AP) as plasticizing solvent mediators. The Tb3+sensor exhibits a Nernstian slope of 19.7±0.4 mV per decade over the concentration range of 1.0×10-5to 1.0×10-2M and a detection limit of 4.6×10-6M of Tb3+ions. The potentiometric response of the sensor is independent of the solution pH in the range of 2.9–8.1. It has a very short response time, in the whole concentration range (∼5 s). The recommended sensor revealed comparatively good selectivity with respect to most alkali, alkaline earth, some transition and heavy metal ions. It was successfully employed as an indicator electrode in the potentiometric titration of Tb(III) ions with EDTA. The electrode was also employed for the determination of the fluoride ion in two mouth wash preparations and the determination of Tb3+ions concentration in mixtures of three different ions.

Highlights

Terbium is classified as a rare earth element
Terbium is used to dope calcium fluoride, calcium tungstate and strontium molybdate, materials that are used in solid-state devices, and as a crystal stabilizer of fuel cells which operate at elevated temperatures, together with ZrO2
There are some instrumental methods for terbium analysis by inductively coupled plasma-atomic emission spectrometry (ICP-AES), ICP-MS, neutron activation analysis (NAA), S204 HASSAN ALI ZAMANI et al

Summary

Introduction

Terbium is classified as a rare earth element. Terbium is used to dope calcium fluoride, calcium tungstate and strontium molybdate, materials that are used in solid-state devices, and as a crystal stabilizer of fuel cells which operate at elevated temperatures, together with ZrO2. Several greatly selective and sensitive polyvinyl chloride (PVC)-membrane ISEs for various metal ions have been reported[21,22,23,24,25,26,27,28,29,30,31,32,33,34,35]. Literature survey shows that four are some reports on selective determination of Tb(III) ions[36,37,38] in presence of other rare earth elements by electrochemical method.

Results

Conclusion