What is Cyanide?

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  • Written By: Michael Pollick
  • Edited By: O. Wallace
  • Last Modified Date: 04 October 2016
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It's easy to assume that the word "cyanide" is always synonymous with a deadly poison. Chemically speaking, however, cyanide describes a triple bond between carbon and nitrogen atoms. This carbon-nitrogen combination can be combined with metals or other elements to form any number of compounds or salts, such as potassium cyanide, sodium cyanide or hydrogen cyanide. It is also found naturally in sugars, cassava roots, large fruit pits and tobacco leaves.

Different cyanide salts are used to process film, remove gold from ore, electroplate or clean metals, and make paper or plastic. In gas form, hydrogen cyanide is used to fumigate warehouses and the cargo areas of ships. The compounds can be stored in liquid, solid or gas form. The infamous "suicide pills" used by spies were often derived from prussic acid, a solid form of the compound.

Perhaps its most insidious use occurred during World War II. Charged with the gruesome task of exterminating large groups of Jewish captives, German concentration camp directors ordered canisters of hydrogen cyanide, sold under the brand name Zyklon B. Victims were ordered into airtight chambers, ostensibly for showers, and the gas would be introduced through the ventilation system. There have also been claims that former Iraqi president Saddam Hussein used this gas to kill thousands of Kurds during an uprising in the late 1980s.


Because cyanide, especially hydrogen cyanide, is produced naturally, it is very difficult for humans to avoid exposure completely. It is not considered to be carcinogenic (cancer-causing) however, and the gas evaporates quickly from groundwater. Long-term exposure to smoke, as in forest fires or cigarettes, is considered dangerous, since this gas is a natural by-product of smoke production. Liquid cyanide products such as insecticides and industrial cleaners can cause localized rashes and blister on exposed skin.

Hydrogen cyanide gas causes death and sickness by preventing normal oxygen absorption by blood cells. As the ions block the oxygen in the blood, the heart and brain suffer major damage. If the concentration of gas is heavy enough, death will occur within minutes of exposure. Victims of cyanide poisoning can be treated at a hospital if transported in time. Lower level exposure can cause dizziness, rapid heart rate, overall weakness and breathing difficulties. Evacuation to a source of fresh air is usually the first response, followed by decontamination and oxygen treatments.


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Post 6

Since cyanide is also found naturally in certain fruit pits, is it unwise to eat those pits? Or is naturally occurring cyanide not as poisonous?

Post 5

Hydrogen cyanide is not actually found naturally in tobacco leaves; it forms in the smoke. Also, in wood smoke, car exhaust, probably many, many other instances where pyrolysis occurs in a low oxygen environment.

Post 3

Thank you very much, this was very interesting, not too difficult to read (I am not from an english speaking country), and really informative. Great site!

Post 2

I'm afraid the answer may be somewhat misleading and has thrown off some of my students answering questions related to cyanide poisoning.

Cyanide does bind to hemoglobin, interfering with oxygen transport to cells. However, it also disrupts mitochondria (specifically the electron transport chain) so that cells cannot produce ATP efficiently. Lack of oxygen does the same thing.

So while it does block oxygen, mitochondria are not using oxygen anyhow since cyanide has halted their function.

I'm fairly certain both factors are at work, depending on dosage of cyanide, but omitting the effect on mitochondria is incomplete for my biology students. -- J. Buegge

Post 1

Thank you very much for your very informative website. This is the second time I have been able to get an answer to my questions via your information provided here.

The history and the detailed explanations about what happens concerning cyanide in its different forms has helped me understand a lot of things that have happened, and do happen, especially when I get around people who are smoking - I may be allergic to the smoke, but it is also literally stealing the oxygen from me. Thanks again. K. Austin

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