Stable. If dissolved in acetonitrile, the solution will be highly flammable.
Toxicology
Highly toxic if swallowed, inhaled or absorbed through the skin.
Toxicity data <
Appearance:often supplied as a solution in acetonitrile.
Hazard Symbols:A cholinesterase inhibitor, absorbed by skin, use may be restricted. TLV: 0.1 mg/m3 (skin); not classifiable as a human carcinogen.
Risk Codes27/28-50/53-36-20/21/22-11
Safety: Poison by ingestion, skin contact, and intraperitoneal routes. An experimental teratogen. A cholinesterase inhibitor. This material is extremely hazardous on contact with skin, inhalation, or ingestion. A highly toxic insecticide. When heated to decomposition it emits highly toxic fumes of SOx, POx, NOx, and phosphine. See also PARATHION, NITRO COMPOUNDS of AROMATIC HYDROCARBONS, PHOSPHINE, and SULFIDES.
Analytical Methods:
For occupational chemical analysis use NIOSH: EPN, Malathion, and Parathion, 5012.