Carlo Pilia
PVC Membrane and Coated Graphite Potentiometric Sensors Based on Et4todit for Selective Determination of Samarium(III)
ARCA, MASSIMILIANO;LIPPOLIS, VITO
2003-01-01
Abstract
Solution studies on the binding properties of 4,5,6,7- tetrathiocino[1,2-b:3,4-b′]diimidazolyl-1,3,8,10-tetraethyl-2,9-dithione (Et4todit) toward a number of cationic spe- cies including some lanthanide ions revealed the occur- rence of a selective 1:1 complexation of the ligand with Sm3+ ion. Consequently, Et4todit was used as a suitable neutral ionophore for the preparation of novel polymeric membrane (PME) and coated graphite (CGE) Sm3+- selective electrodes. The electrodes exhibit a Nernstian behavior for Sm3+ ions over wide concentration ranges (1.0 × 10-5-1.0 × 10-1 M for PME and 1.0 × 10-7- 1.0 × 10-1 M for CGE) and very low limits of detection (8.0×10-6M for PME and 1.6×10-8 M for CGE).The proposed potentiometric sensors manifest advantages of relatively fast response, and, most importantly, good selectivities relative to wide variety of other cations, including other lanthanide ions. The selectivity behavior of the proposed Sm3+-selective electrodes revealed a great improvement compared to the best previously reported electrode for samarium(III) ion. The potentiometric re- sponses of the electrodes are independent of the pH of the test solution in the pH range 4.0-6.5. The electrodes were successfully applied to the recovery of Sm3+ ion from tap water samples and also, as an indicator electrode, in potentiometric titration of samarium(III) ions.File | Dimensione | Formato | |
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