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Chemical Identification
Common Name
Hydrogen cyanide
中文通用名
氰化氢
IUPAC
hydrogen cyanide
CAS
hydrocyanic acid
CAS No.
74-90-8
Molecular Formula
CHN
Molecular Structure
Physical Properties
Molecular weight:27.0g/mol; Physical form:Colourless, flammable liquid, with an odour of almonds. Density:0.699 (20℃); Melting point:-15℃; Vapour pressure:961 kPa (25℃); Henry constant:2.59 Pa m3mol-1 (calc.); pKa:Weak acid; Solubility:Completely miscible with water. Soluble in ethanol and diethyl ether.; Stability:Stable, in the pure form. In the liquid form and in aqueous solution, stabilised by the addition of small quantities of mineral acids.
Toxicology
Oral Acute oral LD50 for rats 10-15 mg/kg.Skin and eye Rapidly absorbed by skin. Eye irritant.Inhalation Exposure for 30 min at 0.36 mg/l air is fatal to man.ADI (JMPR) 0.05 mg/kg b.w. [1965].
Environmental Profile
Ecotoxicology:
Bees:Toxic to bees, but not hazardous if used as directed.Birds:Toxic to birds.Fish:Toxic to fish.
Environmental fate:
Animals:The cyanide ion is metabolised mainly to thiocyanate.
Transport Information
Hazard Class:O (Obsolete as pesticide, not classified)

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