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

Sensors

Hassan A. Arida¹  Mona A. Ahmed¹ 

[1] ¹Hot Lab. Center, Atomic Energy Authority, 13759-Cairo, Egypt ²University college for Grills, Ain Shams University, Cairo, Egypt

关键词: Thorium ion-selective electrode;    PVC membrane;    Thorium oxinate complex;    Potentiometry;    Coated graphite rod;   

DOI  :  10.3390/s31000424

来源: mdpi

【 摘 要 】

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).

【 授权许可】

CC BY   
This is an open access article distributed under the Creative Commons Attribution License (CC BY) which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.