Study on the Determination of Trace Iodine by Flow Injection Catalytic Kinetic Spectrophotometry

The method of catalytic kinetic determination of trace iodine by flow injection was described. Using the decoloring reaction of NaNO_2 and Fe(SCN)~-_4 which iodine catalyzed, the trace iodine was detected by flow injection analysis (FIA). The linear range of the determination of the trace iodine was within 1.0～7.0 μg/mL. The detection limit was 0.5 μg/mL. The RSD was 5.0%. The method has been used to determine trace iodine in water, and the results were acceptable.