Ozone Detection
Ozone
Ozone (O3) is a triatomic molecule consisting of three oxygen atoms. It is an allotrope of oxygen that is much less stable than the diatomic O2. Ground-level ozone is an air pollutant with harmful effects on the respiratory systems of animals.
The ozone layer in the upper atmosphere filters potentially damaging ultraviolet light from reaching the Earth's surface. O3 is also present in low concentrations throughout the Earth's atmosphere and has many industrial and consumer applications.
Ozone has a distinct sharp odour somewhat resembling chlorine bleach. It is detectable to humans from around 0.01 ppm. Exposure to 0.1–1 ppm produces headaches, burning eyes, and irritation to the respiratory passages. Even low concentrations of ozone in air are highly destructive to the lungs and to other organic materials such as latex and plastics.
Ozone Characteristics | ||
---|---|---|
Synonyms | Trioxygen | |
CAS No. | 10028-15-6 | |
Chemical formula | O3 | |
Vapour density | 1.66 (air = 1) | |
Safe Work Australia ES | TWA | 0.1 ppm (peak limitation) |
STEL | --- | |
Flammable limits | LEL | --- |
UEL | --- | |
Equipment group | --- | |
Temperature classification | --- | |
Chemical/physical properties | Ozone is a bluish gas at room temperature with a pungent odour usually detectable by smell at around 0.05 ppm. | |
In chemical jargon it is called an allotrope, which is another form of the element oxygen (chemical symbol O) with a different molecular structure (O3 c.f. O2). Ozone is an even more powerful oxidising agent than oxygen. | ||
Hazardous properties | Despite its similarity to O2, O3 is extremely toxic and very unstable. | |
At very low concentrations it is an irritant, causing respiratory distress and with severe exposure leading to pulmonary oedema, haemorrhage and even death. | ||
Occurrence/Uses | Ozone occurs naturally in the upper atmosphere where it is produced by the solar irradiation of oxygen, forming the ‘ozone layer’ that protects the Earth from excess UV radiation. It is also found in the lower atmosphere as a pollutant in the vicinity of high voltage electrical discharges, UV radiation, X-rays, arc welding etc. and contributes to photochemical smog. | |
Industrially, ozone can be used to purify water, control microbes in the food industry and as a bleaching agent for textiles, paper, wax etc. | ||
Detectors available | Electrochemical (0–1, 0–5 ppm) | |
Gas detector tube (0.025–500 ppm) | ||
Suggested alarm levels | Low: 0.05 ppm | |
High: 0.1 ppm | ||
Notes |
For more information about ozone gas monitoring, contact your local Air-Met office today.
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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)