ASSESSMENT OF IODINE IN DIFFERENT SAMPLES USING 2, 8-DIMETHYL-3, 7-DIAMINOPHENAZINE FOR AN ENVIRONMENTAL FAVORABLE APPROACH

Abstract

An environmental favorable spectrophotometric approach is proposed for the analysis of iodine. The tactic includes oxidation of iodine to iodate, IO with bromine water and therefore the 3 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 5 -1 -1 -5 -2 colour system in 1.90 x 10 l mol cm and 66.78 x 10 m were optimized and the method has been applied for the determination of iodine in tap water and soil.