Determination of microgram quantities of iodine and its concentration in the suspended particles in air

An analytical method for the determination of microgram quantities of iodine was developed by combining the procedure, which liberates six equivalents of iodine from the reaction of iodide and iodate ions produced from iodine in the sample solution, and the method of colorimetric determination of iodine using Leuco Crystal Violet. The proposed method is able to determine the microgram level of iodine and the relative standard deviation was 1.2% for the determination of 7.5 μg of iodine. In addition, the determination of iodine in suspended particles in air was tested, and it was found that the recovery of iodine from glass fiber filter was 82.8%. Furthermore, the determination of iodine in air at the ground surface in Tokyo was carried out, and the average value of iodine concentration in the suspended particles in 1000 m3 of air was found to be about 9.2μg.