Abstract
Ozone reacts with free aqueous chlorine when present as hypochlorite ion (OCl −) with a second order rate constant of 120 ± 15 M −1 s −1 at 20°C. About 77% of the chlorine reacts to produce Cl − and 23% is oxidized to ClO − 3. No ClO − 4 is formed. Conversion of chlorine to monochloramine reduces the ozone reaction rate to 26 ± 4 M −1 s −1, independent of pH, NH 2Cl is transformed quantitatively to NO − 3 and Cl − by O 3. Rate data for other chloramines are also presented. The direct reaction of ozone with chlorine accounts for a significant amount of the chlorine and ozone demand found when the two oxidants are used in combination under water works conditions.
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