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Sensors 2003, 3(11), 509-523; doi:10.3390/s31100509

Iodide Selective Electrodes Based on Bis(2-mercaptobenzothiazolato) Mercury(II) and Bis(4-chlorothiophenolato) Mercury(II) Carriers

Chemistry Department, University of Isfahan, Isfahan 81746-73441, Iran
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Received: 16 August 2003 / Accepted: 12 October 2003 / Published: 5 December 2003
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Abstract

New iodide-selective electrodes based on bis(2-mercaptobenzothiazolato) mercury(II) [Hg(MBT)2] and bis(4-chlorothiophenolato) mercury(II) [Hg(CTP)2] carriers are described. The electrodes were prepared by incorporating the ionophores into plasticized PVC membranes, which were directly coated on the surface of graphite disk electrodes. The electrodes displayed high selectivity for iodide with respect to a number of inorganic and organic anions. The influence of the membrane composition and pH, and the effect of lipophilic cationic and anionic additives on the response properties of the electrodes were investigated. The electrodes exhibited near-Nernstian slopes of -57.6 ± 0.8 and -58.4 ± 1.4 mV/decade of iodide concentration over the range 1 × 10-6 – 1 × 10-1 M, with detection limits of ~4 × 10-7 and 6 × 10-7 M for the electrodes based on [Hg(MBT)2] and [Hg(CTP)2], respectively. They have relatively fast response times (≤ 10 s), satisfactory reproducibility, and life times of at least two months. The potentiometric responses of the electrodes are independent of pH of the test solution over the range 3.5 – 11.5. View Full-Text
Keywords: Iodide selective electrode; Potentiometric sensors; Bis(2- mercaptobenzothiazolato) mercury (II); Bis(4-chlorothiophenolato) mercury(II); Coatedgraphite electrode Iodide selective electrode; Potentiometric sensors; Bis(2- mercaptobenzothiazolato) mercury (II); Bis(4-chlorothiophenolato) mercury(II); Coatedgraphite electrode
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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MDPI and ACS Style

Amini, M.K.; Ghaedi, M.; Rafi, A.; Habibi, M.H.; Zohory, M.M. Iodide Selective Electrodes Based on Bis(2-mercaptobenzothiazolato) Mercury(II) and Bis(4-chlorothiophenolato) Mercury(II) Carriers. Sensors 2003, 3, 509-523.

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