Journal
ANALYTICA CHIMICA ACTA
Volume 664, Issue 2, Pages 172-177Publisher
ELSEVIER
DOI: 10.1016/j.aca.2010.02.016
Keywords
Sensor; Optode; Terbium; Fluorescence
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Funding
- Islamic Azad University Branch of Savadkooh
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For the first time a highly sensitive and selective fluorimetric optode membrane was prepared for determination of trace amounts of Tb(III) ions in phosphate rock samples. The Tb(III) sensing system was constructed by incorporating 5-(dimethylamino)-N'-(2-hydroxy-1-naphthoyl) naphthalene-1-sulfonohydrazine (L) as a neutral Tb(III)-selective fluoroionophore, in the plasticized PVC membrane containing sodium tetraphenyl borate as a liphophilic anionic additive. The response of the optode is based on the strong fluorescence quenching of L by Tb3+ ions. At a pH value of 5.0, the optode displays a wide concentration range of 1.0 x 10(-7) to 1.0 x 10(-2) M, with a relatively fast response time of less than 45 s. In addition, to high stability and reproducibility, the sensor shows a unique selectivity towards Tb3+ ion with respect to common cations. The optode was applied successfully to the trace determination of terbium ion in binary mixture and water samples and the determination of Tb3+ in phosphate rock samples. Crown Copyright (C) 2010 Published by Elsevier B.V. All rights reserved.
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