CAS RN: 460-19-5

Range of Toxicity

A) TOXIC DOSE: The threshold value limit for hydrogen cyanide is 10 parts per million (ppm) for an 8 hour day. A dose of potassium cyanide of 200 mg is likely lethal; however, an adult survived an ingestion of 1200 to 1500 mg potassium cyanide powder without visual or neurologic sequelae following cyanide antidotal therapy with hydroxocobalamin immediately followed by sodium thiosulfate. An immediate inhalational exposure of 270 ppm of hydrogen cyanide gas is likely lethal.
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