Iodide Selective Electrodes Based on Bis(2-mercaptobenzothiazolato) Mercury(II) and Bis(4-chlorothiophenolato) Mercury(II) Carriers
Open Access
- 5 December 2003
- Vol. 3 (11), 509-523
- https://doi.org/10.3390/s31100509
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.Keywords
This publication has 46 references indexed in Scilit:
- Flow injection amperometry for the determination of iodate in iodized table saltAnalytica Chimica Acta, 2001
- Chemiluminescence determination of iodide and/or iodine using a luminol–hexadecyltrimethylammonium chloride reversed micelle system following on-line oxidation and extractionThe Analyst, 2000
- Determination of Chemical Species of Iodine in Seawater by Radiochemical Neutron Activation Analysis Combined with Ion-Exchange PreseparationAnalytical Chemistry, 1999
- Voltammetric determination of the iodide ion with a quinine copper(II) complex modified carbon paste electrodeJournal of Electroanalytical Chemistry, 1999
- Determination of Iodide and Iodate by Ion Chromatography with Postcolumn Reaction and UV/Visible DetectionAnalytical Chemistry, 1998
- Stripping Voltammetric Determination of Iodide with Synergistic Accumulation at a Carbon Paste ElectrodeElectroanalysis, 1998
- Determination of Iodine in Food-related Certified Reference Materials Using Wet Ashing and Detection by Inductively Coupled Plasma Mass SpectrometryJournal of Analytical Atomic Spectrometry, 1997
- Trace level determination of iodide, iodine and iodate by gas chromatography-mass spectrometryJournal of Chromatography A, 1996
- Cathodic pulse stripping analysis of iodine at the parts-per-billion levelAnalytical Chemistry, 1977
- Normal pulse polarographic analysis based on mercury anodization. Sulfide and iodideAnalytical Chemistry, 1975