Chlorine Dioxide

Chlorine dioxide is a chemical compound with the formula ClO2. This yellowish-green gas crystallizes as orange crystals at -59 °C. As one of several oxides of chlorine, it is a potent and useful oxidizing agent used in water treatment and in bleaching.
Chlorine dioxide is a highly endothermic compound that can decompose extremely violently when separated from diluting substances. As a result preparation methods that involve producing solutions of it without going through a gas phase stage are often preferred.
Over 95% of the chlorine dioxide produced in the world today is made from sodium chlorate and is used for pulp bleaching. A much smaller but important market for chlorine dioxide is for use as a disinfectant.
When it comes to Chlorine Dioxide detection, Airmet can offer you custom made solutions for your application. We have a wide range of portable and fixed instruments suitable for most applications. Use the product selector or contact one of our representatives.
Chlorine Dioxide Characteristics
Synonyms Chlorine peroxide
CAS No. 10049-04-4
Chemical formula ClO2
Vapour density 2.3 (air = 1)
Safe Work Australia ES TWA 0.1 ppm
STEL 0.3 ppm
Flammable limits LEL 10.0% by volume (1)
UEL --
Chemical/physical properties Chlorine dioxide is a yellow-red gas at room temperature with an unpleasant odour similar to chlorine and nitric acid and a reported odour threshold of 0.1 ppm. It is highly reactive, is a strong oxidising agent and, similar to chlorine, will support the combustion of other materials.
Hazardous properties Like chlorine, chlorine dioxide is an irritant to the eyes and respiratory system, causing respiratory distress, bronchitis and pulmonary oedema, but its effects are even more severe.
At concentrations in air above 10% by volume there is a risk of chlorine dioxide decomposing explosively if triggered by heat (temperatures of 130°C), light or pressure shock. The presence of other oxidisable substances (e.g. organic dusts) can increase this risk.
Occurrence/Uses Chlorine dioxide is used industrially as a bleaching agent for paper pulp, textiles, flour, fats and oils. Being even more soluble in water than chlorine, it also finds application in water purification (swimming pools and water supplies).
Detectors available Electrochemical (0 – 1 ppm)
Gas detector tube: (1 – 20 ppm)
Suggested alarm levels Lo: 0.1 ppm
Hi: 0.3 ppm
Notes (1) ILO Encyclopaedia of Occupational Health and Safety Vol 1


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