Refined Iodine

　　Main Uses

　　Medical Field:

　　It is an important raw material for preparing disinfectants and antiseptics, such as iodine tincture (iodine alcohol) and povidone-iodine. It utilizes its oxidizing properties to kill bacteria, fungi, and viruses, and is used for skin and mucous membrane disinfection as well as wound treatment.

　　It is used as a raw material for synthesizing thyroid hormones (such as thyroxine T4 and triiodothyronine T3), and clinically it can be used to treat hypothyroidism.

　　Industrial Field:

　　It serves as a catalyst or oxidizing agent in organic synthesis, participating in various chemical reactions (such as iodination reactions and oxidation reactions). It is used in the manufacture of dyes, photosensitive materials (e.g., iodine vapor in iodine tungsten lamps can extend filament life), and battery electrolytes. In the metallurgical industry, it is used to purify certain rare metals.

　　Research and Analysis:

　　As a chemical reagent, it is used for qualitative and quantitative analysis (such as iodometric titration to determine substance content, utilizing the reaction between I₂ and reducing substances).

　　In biological experiments, it is used for staining (e.g., starch turns blue upon encountering iodine, allowing for the observation of starch granules within cells).

　　Food and Agriculture:

　　Potassium iodide is added to table salt (rather than elemental iodine, because iodine sublimates easily and is highly irritating) as an iodine supplement to prevent goiter (enlarged thyroid).

　　In agriculture, it is used to prepare fungicides to control crop diseases.