PVC Membrane and Coated Graphite Potentiometric Sensors Based on Et4todit for Selective Determination of Samarium(III)

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• 作者：Mojtaba Shamsipur ; Morteza Hosseini ; Kamal Alizadeh ; Zahra Talebpour ; Mir Fazlollah Mousavi ; Mohammad Reza Ganjali ; Massimiliano Arca ; and Vito Lippolis
• 刊名：Analytical Chemistry
• 出版年：2003
• 出版时间：November 1, 2003
• 年：2003
• 卷：75
• 期：21
• 页码：5680 - 5686
• 全文大小：125K
• 年卷期：v.75,no.21(November 1, 2003)
• ISSN：1520-6882

文摘

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 species including some lanthanide ions revealed the occurrence of a selective 1:1 complexation of the ligand withSm³⁺ ion. Consequently, Et₄todit was used as a suitableneutral ionophore for the preparation of novel polymericmembrane (PME) and coated graphite (CGE) Sm³⁺-selective electrodes. The electrodes exhibit a Nernstianbehavior 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^-6 M for PME and 1.6 × 10^-8 M for CGE). Theproposed potentiometric sensors manifest advantages ofrelatively fast response, and, most importantly, goodselectivities relative to wide variety of other cations,including other lanthanide ions. The selectivity behaviorof the proposed Sm³⁺-selective electrodes revealed a greatimprovement compared to the best previously reportedelectrode for samarium(III) ion. The potentiometric responses of the electrodes are independent of the pH ofthe test solution in the pH range 4.0-6.5. The electrodeswere successfully applied to the recovery of Sm³⁺ ion fromtap water samples and also, as an indicator electrode, inpotentiometric titration of samarium(III) ions.