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Water Lecture 3 A. Disinfection B. Water Safety Plans - page 31 / 47

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Chlorine Dioxide

High solubility in water  

5 times greater than free chlorine

Strong Oxidant; high oxidative potentials;

2.63 times greater than free chlorine, but only 20 % available at neutral pH

Neutral compound of chlorine in the +IV oxidation state; stable free radical

Degrades in alkaline water by disproportionating to chlorate and chlorite.

Generation:  On-site by acid activation of chlorite or reaction of chlorine gas with chlorite

About 0.5 mg/L doses in drinking water

toxicity of its by-products discourages higher doses

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