The half-life of ozone is much shorter in water than in air. Increased temperature in either
solvent decreases the half-life. Published research indicates a half-life of 20 minutes for ozone
dissolved in water at 20oC, and a half-life of approximately 25 hours for ozone in dry air at 24oC
(McClurkin & Maier, 2010). The practical half-life time is actually less, especially in air, due to
air circulation, humidity, the presence of contaminants or walls with which to react, etc. In many
situations, with air movement, warmer temperatures, and normal relative humidity, the half-life
of ozone in air could be 1 hour or less. Further, ventilation of a closed space to other areas will
also disperse the ozone, so that concentration levels can rapidly decrease after generation ceases.
The half-life of ozone is much shorter in water than in air. Increased temperature in eithersolvent decreases the half-life. Published research indicates a half-life of 20 minutes for ozonedissolved in water at 20oC, and a half-life of approximately 25 hours for ozone in dry air at 24oC(McClurkin & Maier, 2010). The practical half-life time is actually less, especially in air, due toair circulation, humidity, the presence of contaminants or walls with which to react, etc. In manysituations, with air movement, warmer temperatures, and normal relative humidity, the half-lifeof ozone in air could be 1 hour or less. Further, ventilation of a closed space to other areas willalso disperse the ozone, so that concentration levels can rapidly decrease after generation ceases.
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