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Sensors 2003, 3(10), 424-437; doi:10.3390/s31000424
Article

A Novel Coated Graphite Rod Th(IV) Ion Selective Electrode Based On Thorium Oxinate Complex and Its Application

1,* , 2 and 1
1 Hot Lab. Center, Atomic Energy Authority, 13759-Cairo, Egypt 2 University college for Grills, Ain Shams University, Cairo, Egypt
* Author to whom correspondence should be addressed.
Received: 13 July 2003 / Accepted: 14 September 2003 / Published: 31 October 2003
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Abstract

Preparation, characterization, and application of a novel coated graphite rod thorium selective electrode based on thorium 8-hydroxyquinolate [thorium oxinate, Th(C9H6NO)4.2H2O] complex ionophore as a sensing material, dioctylphthalate (DOP) as a solvent mediator, and PVC as a matrix have been developed. The coated graphite rod electrode exhibits a linear Nernstian response over the concentration range 5x10-6 - 1x10-1 mol l-1 of Th(IV) ions, with a calibration slope of 15.5 ± 0.5 mV/concentration decade and a detection limit of 1.6x10-6 mol l-1. It has a fast response time and can be used for a period of two months without any divergence in potentials. The proposed electrode reveals a good selectivity for Th(IV) cation over a varity of other cations and could be used in the pH range of (3 - 5). The sensor was successfully applied in the determination of thorium in real (monazite sand) sample. The average recovery obtained is ranging from 97.0 to 93.4% with standard deviation of 1.5% (n=8).
Keywords: Thorium ion-selective electrode; PVC membrane; Thorium oxinate complex; Potentiometry; Coated graphite rod Thorium ion-selective electrode; PVC membrane; Thorium oxinate complex; Potentiometry; Coated graphite rod
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).
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Arida, H.A.; Ahmed, M.A.; El-Saied, A.M. A Novel Coated Graphite Rod Th(IV) Ion Selective Electrode Based On Thorium Oxinate Complex and Its Application. Sensors 2003, 3, 424-437.

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