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Catalytic spectrophotometric determination of iodide in pharmaceutical preparations and edible salt
Author(s) -
ElRies M.A.,
Khaled Elmorsy,
Zidane F.I.,
Ibrahim S.A.,
AbdElmonem M.S.
Publication year - 2012
Publication title -
drug testing and analysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.065
H-Index - 54
eISSN - 1942-7611
pISSN - 1942-7603
DOI - 10.1002/dta.253
Subject(s) - iodide , malachite green , chemistry , detection limit , oxidizing agent , catalysis , rhodamine b , methylene blue , salt (chemistry) , spectrophotometry , bromide , nuclear chemistry , iodine , brilliant green , chromatography , inorganic chemistry , organic chemistry , adsorption , photocatalysis
The catalytic effect of iodide on the oxidation of four dyes: viz. variamine blue (VB), methylene blue (MB), rhodamine B (RB), and malachite green (MG) with different oxidizing agents was investigated for the kinetic spectrophotometric determination of iodide. The above catalyzed reactions were monitored spectrophotometrically by following the change in dye absorbances at 544, 558, 660, or 617 nm for the VB, RB, MB, or MG catalyzed reactions, respectively. Under optimum conditions, iodide can be determined within the concentration levels 0.064–1.27 µg mL −1 for VB method, 3.20–9.54 µg mL −1 for RB method, 5.00–19.00 µg mL −1 for the MB method, and 6.4–19.0 µg mL −1 for the MG one, with detection limit reaching 0.004 µg mL −1 iodide. The reported methods were highly sensitive, selective, and free from most interference. Applying the proposed procedures, trace amounts of iodide in pharmaceutical and edible salt samples were successfully determined without separation or pretreatment steps. Copyright © 2011 John Wiley & Sons, Ltd.