Magnesium-PVC Membrane Sensor Based on 4,5-Bis(Benzoylthio)-1,3-Dithiole-2-Thione

被引：24
作者：
Zamani, Hassan Ali [1 ]
Nezhadali, Azizollah [2 ]
Saghravanian, Malyheh [2 ]
机构：
[1] Islamic Azad Univ, Quchan branch, Dept Appl Chem, Quchan, Iran
[2] Payamenoor Univ, Dept Chem, Mashhad, Iran
来源：
ANALYTICAL LETTERS | 2008年 / 41卷 / 14期
关键词：
4; 5-Bis(benzoylthio)-1; 3-dithiole-2-thione; ion-selective electrode; magnesium; potentiometry; PVC membrane; sensor;
D O I：
10.1080/00032710802363560
中图分类号：
O65 [分析化学];
学科分类号：
070302 ; 081704 ;
摘要：
This report describes an attempt to develop potentiometric Mg2+ sensors based on a liquid polymeric membrane. Membrane incorporating 4,5-Bis(benzoylthio)-1,3- dithiole-2-thione (Bz2dmit) as ionophore, with composition Bz2 dmit:NaTPB:NB:PVC in the ratio 2.5:2.5:65:30 (w/w), exhibits the best result for potentiometric sensing of Mg2+ ions. The proposed electrode, based on Bz2 dmitwith nitrobenzene (NB) as a solvent mediator in a polyvinyl chloride (PVC) membrane matrix, exhibited a near-Nernstian response to Mg2+ in the concentration range of 1.010-5 to 1.010-1M, with a slope of 29.2mV per decade of activity of Mg2+. The lower limit of detection was 1.010-5M. This sensor showed high selectivity with respect to alkaline, alkaline earth, transition, and heavy metal ions, except for Sr2+, and could be used over a pH range of 3.5-9.0. It can be used for at least 2 mo without considerable divergence in potentials and has a relatively fast response of10s. It was applied successfully as an indicator electrode in potentiometric titration of Mg2+ ions with EDTA.
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页码：2727 / 2742
页数：16
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