Chinese name: iodine

English name: Iodine

Molecular weight: 253.8

CAS Registry Number: 7553-56-2

EINECS login number: 231-4442-4

Melting point: 113 ℃

Boiling point: 184 ℃

Water solubility: 0.3g / L (20 ℃)

Density: 1.32g / mL (25 ℃)

Outside view: purple-black shiny crystals

Should be used: manufacturing drugs, dyes, iodine, test paper and iodide, etc.

Safety description: S26-61-25-23-36 / 37-16

Hazard symbols: Xn, N, F

Hazard description: R36 / 37 / 38-50-20 / 21-36 / 38-20 / 21 / 22-22-40-19-11-36 / 37

Dangerous goods transport number: UN 2056 3 / PG 2

Atomic weight: 126.9

Elemental chemical formula: I2

Element symbol: I

Application field

Iodine is extremely important to the life of animals and plants. The iodide and iodate in the sea water enter the metabolism of most sea creatures. In higher mammals, iodine is concentrated in the thyroid in the form of iodinated amino acids, and lack of iodine can cause goiter. About 2/3 of iodine and its compounds are used to prepare preservatives, disinfectants and medicines, such as iodine tincture and iodoform CHI3. Sodium iodate is used as a food additive to supplement insufficient iodine intake. The radioisotope iodine-131 is used in radiotherapy and radiotracing technology. Iodine can also be used to make dyes and photographic film.

Iodine and its related compounds are mainly used in medicine, photography and dyes. It can also be used as a tracer for system monitoring, for example for geothermal system monitoring. In addition to being used as a sensitizer for photographic film, silver iodide (AgI) can also be used as a seed crystal for cloud formation during artificial rainfall. The alcohol solution of I2 and KI is iodine, which is a commonly used disinfectant; iodoform (CHI3) is used as a preservative.

Standardize sodium thiosulfate standard solution. Determine the iodine value of fat. The color reaction of magnesium and acetate. Manufacturing iodane and iodide, etc. Colorimetric determination of starch. Determination of non-protein nitrogen and amylase in serum. Prepare solid violet and toluidine blue iodine solution. catalyst. Disinfectant.

Iodine-containing preparations such as iodine tincture, compound iodine solution, iodine lozenges, iodine glycerin, etc. are widely used medicines in medical treatment. Iodine tincture is a common disinfectant in the family.