Facts about Cyanide
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What cyanide is
- Cyanide is a rapidly
acting, potentially deadly chemical that can exist in various forms. - Cyanide can be a colorless
gas, such as hydrogen cyanide (HCN) or cyanogen chloride (CNCl), or a crystal
form such as sodium cyanide (NaCN) or potassium cyanide (KCN). - Cyanide gas sometimes
is described as having a “bitter almond” smell, but it does not always give
off an odor, and not everyone can detect this odor. - Cyanide is also known
by the military designations AN (for hydrogen cyanide) and CK (for cyanogen
chloride).
Where cyanide is found and how it is used
- Cyanide is naturally
present in some foods and in certain plants such as cassava. Cyanide is contained
in cigarette smoke and the combustion products of synthetic materials such
as plastics. Combustion products are substances given off when things burn. - In manufacturing, cyanide
is used to make paper, textiles, and plastics. It is present in the chemicals
used to develop photographs. Cyanide salts are used in metallurgy for electroplating,
metal cleaning, and removing gold from its ore. Cyanide gas is used to exterminate
pests and vermin in ships and buildings. - If accidentally ingested
(swallowed), chemicals found in acetonitrile-based products that are used
to remove artificial nails can produce cyanide. - Hydrogen cyanide, under
the name Zyklon B, was used as a genocidal agent by the Germans in World War
II. - Reports have indicated
that during the Iran-Iraq War in the 1980s, hydrogen cyanide gas may have
been used along with other chemical agents against the inhabitants of the
Kurdish city of Halabja in northern Iraq.
How people can be
exposed to cyanide
- Cyanide enters water,
soil, or air as a result of both natural processes and industrial activities.
In air, cyanide is present mainly as gaseous hydrogen cyanide. - People may be exposed
to cyanide by breathing air, drinking water, eating food, or touching soil
that contains cyanide. - Smoking cigarettes is
probably one of the major sources of cyanide exposure for people who do not
work in cyanide-related industries.
How cyanide works
- Poisoning caused by cyanide
depends on the amount of cyanide a person is exposed to, the route of exposure,
and the length of time that a person is exposed. - Breathing cyanide gas
causes the most harm, but ingesting cyanide can be toxic as well. - Cyanide gas is most dangerous
in enclosed places where the gas will be trapped. - Cyanide gas evaporates
and disperses quickly in open spaces, making it less harmful outdoors. - Cyanide gas is less dense
than air, so it will rise. - Cyanide prevents the
cells of the body from getting oxygen. When this happens, the cells die. - Cyanide is more harmful
to the heart and brain than other organs because the heart and brain use a
lot of oxygen.
Immediate signs
and symptoms of cyanide exposure
- People exposed to a small
amount of cyanide by breathing it, absorbing it through their skin, or eating
foods that contain it may have some or all of the following symptoms within
minutes:- Rapid breathing
- Restlessness
- Dizziness
- Weakness
- Headache
- Nausea and vomiting
- Rapid heart rate
- Exposure to a large amount
of cyanide by any route may cause these other health effects as well:- Convulsions
- Low blood pressure
- Slow heart rate
- Loss of consciousness
- Lung injury
- Respiratory failure
leading to death
What the long-term
health effects may be
Survivors of serious cyanide poisoning may develop delayed neurological effects,
most commonly symptoms resembling Parkinson’s disease.
How people can
protect themselves and what they should do if they are exposed to cyanide
- First, get fresh air
by leaving the area where the cyanide was released. Moving to an area with
fresh air is a good way to reduce the possibility of death from exposure to
cyanide gas.- If the cyanide release
was outside, move away from the area where the cyanide was released. - If the cyanide release
was indoors, get out of the building.
- If the cyanide release
- If leaving the area that
was exposed to cyanide is not an option, stay as low to the ground as possible. - Remove any clothing that
has liquid cyanide on it. If possible, seal the clothing in a plastic bag,
and then seal that bag inside a second plastic bag. - Rinse the eyes with plain
water for 10 to 15 minutes if they are burning or vision is blurred. - Wash any liquid cyanide
from the skin thoroughly with soap and water. - If cyanide is known to
be ingested (swallowed), do not induce vomiting or give fluids to drink. Seek
medical attention right away. - Stay calm. Dial 911 and
explain what has happened. - Wait for emergency personnel
to arrive.
How cyanide poisoning is treated
Cyanide poisoning is treated
with antidotes and supportive medical care. The most important thing is for
victims to seek medical treatment as soon as possible.
How people can get more information about cyanide
People can contact one of
the following:
- Regional poison control
center (1-800-222-1222) - Centers for Disease Control
and Prevention Public Response Hotline (CDC)- English (888) 246-2675
- Español (888) 246-2857
- TTY (866) 874-2646
- Agency for Toxic Substances
and Disease Registry (ATSDR) (1-888-422-8737) - Centers for Disease Control
and Prevention (CDC), National Institute for Occupational Safety and Health
(NIOSH), Pocket
Guide to Chemical Hazards (http://www.cdc.gov/niosh/npg/npgd0000.html)