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New kinetic-spectrophotometric method for monitoring the concentration of iodine in river and city water samples
Authors:A Farmany  A Khosravi  S Abbasi  J Cheraghi  R Hushmandfar  S Sobhanardakani  H Noorizadeh  S S Mortazavi
Institution:1. Young Researchers Club, Hamedan Branch, Islamic Azad University, Hamedan, Iran
2. Department of Microbiology, Ilam University of Medicinal Sciences, Ilam, Iran
3. Department of Chemistry, Faculty of Basic Sciences, Ilam University, Ilam, Iran
4. Faculty of Paraveterinary, Ilam University, Ilam, Iran
5. Department of Environment, Hamedan Branch, Islamic Azad University, Hamedan, Iran
6. Department of Chemistry, Ilam Branch, Islamic Azad University, Ilam, Iran
Abstract:A new kinetic method has been developed for the determination of iodine in water samples. The method is based on the catalytic effect of I? with the oxidation of Indigo Carmine (IC) by KBrO3 in the sulfuric acid medium. The optimum conditions obtained are 0.16 M sulfuric acid, 1?×?10?3 M of IC, 1?×?10?2 M KBrO3, reaction temperature of 35°C, and reaction time of 80 s at 612 nm. Under the optimized conditions, the method allowed the quantification of I? in a range of 12–375 ng/mL with a detection limit of 0.46 ng/mL. The method was applied to the determination of iodine in river and city water samples with the satisfactorily results.
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