Half life get down
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The radicals that are produced during reaction 2 can introduce other reactions with ozone, causing more OH-radicals to be formed. These hydroxide ions act as an initiator for the decay of ozone: In a solution with a high pH value, there are more hydroxide ions present, see formulas below. When the pH value increases, the formation of OH-radicals increases. Table 1: half-life of ozone in gas and water at different temperaturesĪs mentioned above, ozone decomposes partly in OH-radicals. Principally, ozone dissolved in water cannot be applied when temperatures are above 40 ☌, because at this temperature the half-life of ozone is very short. On the other hand, the reaction speed increases with a factor 2 or 3 per 10 ☌. The solubility of ozone decreases at higher temperatures and is less stable. In water the half-life of ozone is much shorter than in air, in other words ozone decomposes faster in water. Table 1 shows the half-life of ozone in air and water. Temperature has an important influence on the half-life of ozone. Here, the main influence factors for ozone decomposition will be discussed.
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Factors influencing the decomposition of ozone in water are temperature, pH, environment and concentrations of dissolved matter and UV light. Dependent on the quality of the water, the half-life of ozone is in the range of seconds to hours. The decay of ozone in OH-radicals in natural waters is characterized by a fast initial decrease of ozone, followed by a second phase in which ozone decreases by first order kinetics. When these OH-radicals are in the dominant particles in the solution, it is called an advanced oxidation process (AOP). Therefor, the assessment of an ozone process always involves the reactions of two species: ozone and OH-radicals. Ozone decays in water under drinking water conditions (pH: 6-8,5), partly in reactive OH-radicals. The half-life of ozone in water is a lot shorter than in air (see table 1). Ozone decomposition When ozone is produced it will decay rapidly, because ozone is an instable compound with a relatively short half-life.
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