Hydrogen iodide

Agent Name
Hydrogen iodide
Alternative Name
Hydriodic acid
CAS Number
10034-85-2
Formula
H-I
Major Category
Toxic Gases & Vapors
Hydrogen iodide formula graphical representation
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]
Biomedical References

Exposure Assessment

TIH
Yes
TLV (ACGIH)
0.01 ppm, inhalable fraction and vapor (iodides)
Explanatory Notes
The Guide from the Emergency Response Guidebook is for "Hydrogen iodide, anhydrous."
NFPA
will not burn

Adverse Effects

Toxic Pneumonitis
Yes
Dermatotoxin
Skin burns

Diseases, Processes, and Activities Linked to This Agent

Diseases

Occupational diseases associated with exposure to this agent: