Hydrogen iodide

Synonyms

Acide iodhydrique [French]; Acido yodhidrico [Spanish]; Anhydrous hydriodic acid; Hydriodic acid, solution; Hydrogen iodide solution; Hydrogen iodide, anhydrous; Hyriodic acid; Iodure d'hydrogene anhydre [French]; Yoduro de hidrogeno anhidro [Spanish]; [ChemIDplus] UN2197; UN1787 (solution)

Category

Acids, Inorganic

Description

Colorless acrid gas that fumes in moist air; Hydriodic acid: Colorless liquid that quickly turns yellowish or brown on exposure to light and air; [Merck Index] Colorless compressed liquefied gas with a pungent odor; [ICSC]

Sources/Uses

Used as a reducing agent and in laboratory analysis; Used to produce pharmaceuticals, disinfectants, and other chemicals; [HSDB]

Comments

Highly corrosive to skin; [Quick CPC] Inhalation exposures of 35 ppm can cause irritation of the throat, and higher exposures can cause laryngeal edema and pulmonary edema. [HSDB] When spilled in water, Acetyl iodide can release Hydrogen iodide. [ERG 2016] Decomposed by light; Anhydrous hydrogen iodide forms hydriodic acid when mixed with water; A strong irritant; [Merck Index] Evaporating liquid can cause frostbite; Corrosive to skin, eye, and respiratory tract; Inhalation may cause severe swelling of the throat and pulmonary edema; [ICSC] See "Iodine" for the TLV of Iodides.

Biomedical References

Yes

0.01 ppm, inhalable fraction and vapor (iodides)

Explanatory Notes

The Guide from the Emergency Response Guidebook is for "Hydrogen iodide, anhydrous."

will not burn

Yes

Skin burns

Diseases

Occupational diseases associated with exposure to this agent:

• Pneumonitis, toxic