Kinetic-Spectrophotometric Determination of Micro Iodine in Food

A new kinetic spectrophotometric method for the determination of micro amounts of iodine was developed based on the principle that I - inhibits the discoloration of metanil yellow oxidized by potassium bromate in sulfuric acid medium in the presence of sodium thiosulfate.The linear range for determination of iodine is 0.02—0.4mg/L,the detection limit is 1.5×10 -8 g/mL.The method was used for the determination of micro amounts of iodine in food with satisfactory results.