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|Section2= |Section3= |Section5= |Section6= |Section7= |Section8= }} Potassium iodide is an inorganic compound with the chemical formula KI. This white salt is the most commercially significant iodide compound, with approximately 37,000 tons produced in 1985. It is less hygroscopic (absorbs water less readily) than sodium iodide, making it easier to work with. Potassium iodide occurs naturally in kelp.〔(【引用サイトリンク】title=Kelp, Herb Monograph - Flora Health Herb Encyclopedia )〕 Kelp's iodide content can range from 89 µg/g to 8165 µg/g. Aged and impure samples are yellow because of the slow oxidation of the salt to potassium carbonate and elemental iodine. : 4 KI + 2 CO2 + O2 → 2 K2CO3 + 2 I2 Potassium iodide is medicinally used for thyroid blockade, thyroid storm and also as an expectorant. It is on the World Health Organization's List of Essential Medicines, the most important medications needed in a basic health system. ==Industrial uses== KI is used with silver nitrate to make silver iodide (AgI) an important chemical in film photography. KI is a component in some disinfectants and hair treatment chemicals. KI is also used as a fluorescence quenching agent in biomedical research, an application that takes advantage of collisional quenching of fluorescent substances by the iodide ion. However, for several fluorophores addition of KI in µM-mM concentrations results in increase of fluorescence intensity, and iodide acts as fluorescence enhancer. Potassium iodide is a component in the electrolyte of dye sensitized solar cells (DSSC) along with iodine. Potassium iodide finds its most important applications in organic synthesis mainly in the preparation of aryl iodides in the Sandmeyer reaction, starting from aryl amines. Aryl iodides are in turn used to attach aryl groups to other organics by nucleophilic substitution, with iodide ion as the leaving group. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Potassium iodide」の詳細全文を読む スポンサード リンク
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