Abstract: Objective: It afford a visualized and swift method to the determination of the micro-iodine in iodic-salt. Methods: This article adopted ion-selective electrode-direct reading method to determine the iodine in iodic-salt. The experiment re- searched the TISAB, reducing agent, the recovery, the precision and the detection limit and the interference of this method, and the samples was determined. Results: The recovery is 95.2%～111.5%, the RSD( n=11) is 0.9%, the detection limit is 1.10× 10-2mg/L. Conclusions: This method is infallible and the result is satisfying.

Key words: ion-selective electrode, direct-reading method, iodic-salt, micro-iodine