Abstract :
An environmental favorable spectrophotometric approach is proposed for the analysis of iodine. The tactic includes oxidation of iodine to iodate, IO3- with bromine water and therefore the liberation of free iodine from the iodate by addition of iodide in acidic medium pH 4 ± 0.2. The liberated iodine bleaches the pinkish red color of 2,8-dimethyl-3,7-diaminophenazine. The decrease in the intensity of the colour of the dye was measured at 530 nm. Beer's law is obeyed in the concentration range of 2-13 µg of iodine. The molar absorptivity and Sandell’s sensitivity of the colour system in 1.90 x 105 l mol-1 cm-1 and 66.78 x 10-5 cm-2 respectively. The analytical parameters were optimized and the method has been applied for the determination of iodine in tap water and soil.
Keyword :
Environment, Iodine, Spectrophotometric, Sustainable approach.