Physical Chemical and Safety Properties of Cl02

ClO2 is a neutral compound of chlorine in the +IV oxidation state. It disinfects by oxidation; however, it does not chlorinate. The major oxidation/reduction is:

ClO2 gas is usually mixed with nitrogen or air and has a yellowish green color. It has an odor similar to chlorine and sodium hypochlorite and can be easily detected at levels as low as about 0.1 ppm in air. ClO2 gas has a density 2.4 times that of air. It is unstable as a gas and can decompose to chlorine and oxygen with noise, heat, flame, and a minor pressure wave at low concentrations. Selected physical, chemical, and safety properties of ClO2 gas are summarized in Table 18.1. ClO2 is also highly water soluble and does not

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