Hydrogen Cyanide Detection
Hydrogen Cyanide
Hydrogen cyanide is a chemical compound with chemical formula HCN. Hydrogen cyanide is a colourless, extremely poisonous liquid that boils at 26°C.
Hydrogen cyanide has a faint, bitter, almond-like odour that some people are unable to detect due to a genetic trait. The volatile compound has been used as inhalation rodenticide and human poison.
HCN is produced on an industrial scale and is a highly valuable precursor to many chemical compounds, ranging from polymers to pharmaceuticals.
Air-Met has a wide range of portable and fixed gas detectors as well as detection tubes available for detection of HCN. For more information, please contact one of our sales representatives.
Hydrogen Cyanide Characteristics | ||
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Synonyms | Hydrocyanic acid, Methanenitrile, Prussic acid | |
CAS No. | 74-90-8 | |
Chemical formula | HCN | |
Vapour density | 0.90 (air = 1) | |
Safe Work Australia ES | TWA | 10 ppm peak limitation |
STEL | --- | |
Flammable limits | LEL | 5.4 % by volume |
UEL | 46.0 % by volume | |
Equipment group | IIB | |
Temperature classification | T1 | |
Chemical/physical properties | Hydrogen cyanide is a colourless, volatile liquid, readily forming a colourless, flammable vapour at room temperature. It has a characteristic odour of bitter almonds that is not always detectable. | |
Hazardous properties | Hydrogen cyanide, like other cyanide salts (sodium cyanide, potassium cyanide etc.), is extremely toxic due to the solubility of the cyanide ion (CN-) and the inhibitory effect it has on critical respiratory enzymes. This prevents the uptake of oxygen by the tissues and leads to asphyxiation and death. It has been reported that exposure to a concentration of 3,500 ppm can be fatal within 1 minute. | |
As well as the risk due to inhalation, it is readily absorbed through the skin. | ||
Although it is flammable, the risk of explosion is far outweighed by its toxicity – everyone in the vicinity would be dead long before LEL is reached! | ||
Occurrence/Uses | Hydrogen cyanide has been used as fumigant but its main application is in the extraction of mineral ores (e.g. gold and silver). It is also a by-product of combustion and is found in vehicle exhaust, tobacco smoke, wood smoke and smoke from burning nitrogen containing plastics (e.g. ABS – acrylonitrile butadiene styrene). | |
Detectors available | Electrochemical (0 – 30 ppm) | |
Colorimetric paper tape (0 – 2,500 ppb) | ||
Gas detector tube (0.3 ppm – 3.0 % by volume) | ||
Suggested alarm levels | Lo: 5 ppm | |
Hi: 10 ppm | ||
Notes |
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- Acetone
- Acetylene Detection
- Ammonia Detection
- Arsine Detection
- Benzene Detection
- Butane
- Carbon Dioxide Detection
- Carbon Monoxide Detection
- Chlorine Detection
- Chlorine Dioxide Detection
- Diborane
- Ethyl Alcohol
- Ethylene Detection
- Ethylene Oxide Detection
- HDI [Hexamethylene Diisocyanate]
- Hexane
- HMDI [Hydrogenated MDI]
- Hydrogen Bromide
- Hydrogen Chloride Detection
- Hydrogen Cyanide Detection
- Hydrogen Detection
- Hydrogen Fluoride
- Hydrogen Sulfide Detection
- IPDI [Isophorone Diisocyanate]
- MDI [Methylene Bisphenyl Isocyanate]
- Mercury
- Methane Detection
- Methyl Alcohol
- Methylene Chloride
- Nitric Oxide Detection
- Nitrogen Dioxide Detection
- Nitrous Oxide
- Oxygen Detection
- Ozone Detection
- Pentane
- Phosphine Detection
- Propane
- Refrigerant Gases
- Silane Detection
- Sulfur Dioxide Detection
- TDI [2,4 Toluene Diisocyanate]
- Toluene
- Xylene (o-, m-, and p-isomers)