- Arsenic trihydride
- Hydrogen arsenide
A colorless gas with a disagreeable garlic odor.
Organic synthesis, military poison, doping agent for solid-state electronic components.
Registry Numbers and Inventories.
EC Index Number
Extremely flammable; Very toxic; Harmful; Dangerous for the Environment
Tumorigen; Human Data
Swiss Giftliste 1
Japan ENCS (MITI)
Melting point, °C
Boiling point, °C
Vapor pressure, mmHg
80.7 (-100.8 C)
Vapor density (air=1)
2.66 / 2.695
Solubility in water
0.0147 cp (0 C)
Heat of fusion
Hazards and Protection.
Prolonged exposure of the cylinders to. Heat may result in the cylinders violent rupturing and rocketing. Store in areas clear of food or food products and combustible materials.
All chemicals should be considered hazardous. Avoid direct physical contact. Use appropriate, approved safety equipment. Untrained individuals should not handle this chemical or its container. Handling should occur in a chemical fume hood.
Wear appropriate protective gloves, clothing and goggles -- as recommended by the manufacturer. Always wear thermal protective clothing when handling refrigerated/cryogenic liquids.
Wear positive pressure self-contained breathing apparatus (SCBA).
Keep sparks, flames, and other sources of ignition away. Keep material out of water sources and sewers. Attempt to stop leak if without undue personnel hazard. Use water spray to knock-down vapors.
May react vigorously with other oxidizing agents.
When heated to decomposition, emits highly toxic fumes.
Upper exp. limit, %
Lower exp. limit, %
Cool containers that are exposed to flames with water from the side until well after fire is out. Isolate for 1/2 mile in all directions if tank car or truck is involved in fire.Let small fires burn. Use water spray, fog, or foam for large fires. For massive fire in cargo area use unmanned hose holder or monitor nozzles; if this is impossible, withdraw from area and let fire burn.
Moderate fire hazard, when exposed to flame. Arsine is an extremely flammable gas and may be ignited by sparks and flame. Flammable vapor may spread from spill area.
Vapors may travel to a source of ignition and flash back. Container may explode in heat of fire. When heated to decomposition, emits highly toxic fumes. Can react vigorously with oxidizing materials. May explode when exposed to chlorine, nitric acid, or potassium plus ammonia. On exposure to light, moist arsine decomposes quickly, depositing shiny black arsenic.
It burns in air with a bluish flame forming arsenic trioxide; when flame is applied to cold surface, arsenic is deposited emits highly toxic fumes..
TLV: 0.05 ppm; 0.16 mg/m3 (ACGIH 1993-1994). OSHA PEL: TWA 0.05 ppm (0.2 mg/m3) NIOSH REL: Ca C 0.002 mg/m3 15-minute See Appendix A NIOSH IDLH: Potential occupational carcinogen 3 ppm
Abnormally low blood pressure may occur. Headache is often an early sign of poisoning.
Nausea, vomiting, anorexia, and abdominal pain often develop in arsine poisoning.
Abdominal pain, confusion, dizziness, nausea, shortness of breath, vomiting, weakenss, Rapid evaporation of liquid may cause frostbite. May cause effects on the blood resulting in destruction of blood cells and kidney failure. Effects may be delayed.
Abnormal pigmentation may be observed. A peculiar bronze tint been described as characteristic of arsine poisoning.
Red staining of the the mucous membrane that lines the inner surface of the eyelid and the exposed surface of the eyeball and a garlicky odor of the breath may be early signs in an arsine poisoning. Frostbite on contact with liquid.
Arsine is present as a gas at room temperature, so ingestion is unlikely.
Move patient to fresh air. Monitor for respiratory distress. If cough or difficulty breathing develops, evaluate for respiratory tract irritation, bronchitis, or pneumonitis. Administer oxygen and assist ventilation as required. Treat bronchospasm with beta2 agonist and corticosteroid aerosols.
Remove contaminated clothing and wash exposed area thoroughly with soap and water. A physician should examine the area if irritation or pain persists.
Irrigate exposed eyes with copious amounts of tepid water for at least 15 minutes. If irritation, pain, swelling, lacrimation, or photophobia persist, the patient should be seen in a health care facility.
USCG CHRIS Code
Std. Transport #