Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
10559560 | Talanta | 2011 | 6 Pages |
Abstract
Four sensitive catalytic potentiometric methods have been developed for trace levels determination of iodide based on its catalytic effects on the oxidation of four dyes: viz. variamine blue (VB), rhodamine B (RB), methylene blue (MB) and malachite green (MG), with H2O2 in H3PO4 medium at 25 ± 0.5 °C. The catalyzed reaction rates were estimated potentiometrically by monitoring the potential of the corresponding dye-PVC ion selective electrodes. To select the optimized reaction conditions offering the highest sensitivity of the method, parallel studies were carried out on each dye catalyzed reaction including: the effect of reactant concentration, reaction medium and temperature. The working calibration curves were linear over the concentration range from 0.32 to 2.54 mg Lâ1 iodide for VB method and from 3.2 to 12.7 mg Lâ1 for other ones. The tolerance limits of more than 20 interfering species were listed indicating the high selectivity of the method. Trace iodide in edible salt and pharmaceutical samples was determined without the need for separation or preconcentration procedures.
Related Topics
Physical Sciences and Engineering
Chemistry
Analytical Chemistry
Authors
Elmorsy Khaled, M.A. El-Ries, F.I. Zidane, S.A. Ibrahim, M.S. Abd-Elmonem,