hydrogen cyanide

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 (H) [hi´dro-jen]
a chemical element, atomic number 1, atomic weight 1.00797. (See Appendix 6.) It exists as the mass 1 isotope (protium, or light or ordinary hydrogen), mass 2 isotope (deuterium, heavy hydrogen), and mass 3 isotope (tritium).
hydrogen cyanide an extremely poisonous colorless liquid or gas, HCN, a decomposition product of various naturally occurring glycosides and a common cause of cyanide poisoning. Inhalation of the gas can cause death within a minute. Called also hydrocyanic acid.
heavy hydrogen deuterium.
hydrogen ion concentration the degree of concentration of hydrogen ions (the acid element) in a solution. Its symbol is pH, and it expresses the degree to which a solution is acidic or alkaline. The pH range extends from 0 to 14, pH 7 being neutral, a pH of less than 7 indicating acidity, and one above 7 indicating alkalinity. See also acid-base balance.
hydrogen peroxide H2O2, an antiseptic with a mildly antibacterial action. A 3 per cent solution foams on touching skin or mucous membrane and appears to have a mechanical cleansing action.
hydrogen sulfide H2S, a poisonous gas with an offensive smell, released from decaying organic material, natural gas, petroleum, and sulfur deposits, and sometimes used as a chemical reagent.
Miller-Keane Encyclopedia and Dictionary of Medicine, Nursing, and Allied Health, Seventh Edition. © 2003 by Saunders, an imprint of Elsevier, Inc. All rights reserved.

hy·dro·cy·an·ic ac·id (HCN),

(hī'drō-sī-an'ik as'id),
HCN; A colorless, toxic liquid, with the odor of bitter almonds, present in bitter almonds (amygdalin), the stones of peaches, plums, and other drupes, and laurel leaves; inhalation of 300 ppm causes death.
Farlex Partner Medical Dictionary © Farlex 2012

hy·dro·gen cy·a·nide

(HCN) (hī'drō-jen sī'ăn-īd)
A highly toxic cellular asphyxiant, HCN, used as a fumigant and also as a chemical-warfare agent. Its NATO code is AC.
Medical Dictionary for the Health Professions and Nursing © Farlex 2012
References in periodicals archive ?
According to the Chinese Integrated emission standard of air pollutants GB16297-1996 [17], the hydrogen cyanide emission limit of a polluting unit built after January 1, 1997 must be lower than 1.9 mg/[m.sub.3].
In 2012, Invista, an Orange County fiber producer, released at least 14 pounds of hydrogen cyanide from a leaky valve.
* Exposure to hydrogen cyanide requires supportive care and rapid administration of specific antidotes.
At pH<9.2 free cyanide in aqueous solution exists as hydrogen cyanide (volatile form).
Hydrogen cyanide (HCN) is highly toxic and can kill within eight minutes.
According to court documents, the folder contained information on hydrogen cyanide - used in chemical weapons - and the teachings of Osama Bin Laden.
As a result, EFSA will also examine health risks associated with hydrogen cyanide and its salts, because it can spark ethyl carbamate generation.
The informant said that operatives had planned to use a small, easily-concealed delivery system to release hydrogen cyanide into multiple subway cars.
1987, 1988, 2000), hydrogen cyanide (Fechter et al.
Users can record a property's levels of nitrogen dioxide, nitric oxide, sulfur dioxide, hydrogen sulfide, hydrogen cyanide, ethylene oxide, oxygen, ammonia, chlorine, carbon monoxide and more, plus temperature.
Units are available for oxygen, hydrogen sulfide, carbon monoxide, sulfur dioxide, chlorine, nitrogen dioxide, phosphine, ammonia, hydrogen, hydrogen cyanide, or combustibles as %LEL.