① The detection limit of inorganic iodine content is 20 mu; G / L (20 & mu; g / kg), the lower limit of linear range is 50 & mu; g/L。

② The detection limit is 3mg / kg and the linear range is 5mg / kg ~ 50mg / kg

③ Based on the principle of microwave digestion, the total iodine and inorganic iodine were determined by iodine probe method, and the organic iodine content was calculated by subtraction (a world-wide method)

④ The content of organic iodine (seaweed iodine and kelp) and inorganic iodine in the sample can be tested

④ It can test the content of organic iodine and inorganic iodine in seaweed iodine added to iodized salt

⑤ There was no loss of iodine during microwave digestion

⑥ The test resolution of seaweed iodine (organic iodine) in iodized salt is 0.1mg/kg ~ 0.15mg/kg

⑦ Iodine probe method reagent is simple: potassium iodate, sodium sulfite, phosphoric acid, potassium sulfate, potassium hydroxide (or sodium hydroxide)

⑧ Compared with redox titration (carbonization and ashing), the iodine probe method has less equipment, less reagents and simple operation

⑨ Compared with arsenic cerium catalytic spectrophotometry, the iodine probe method does not use arsenic trioxide (As2O3) and other * reagents