常温下臭氧半衰期实验及理论分析

Experiment and Theoretical Analysis of the Half Life of Ozone Under Normal Temperature

研究臭氧半衰期规律,对Swarlar等人建立的室内化学暴露模型在臭氧自然衰减情况下进行修正,推导出密闭环境舱内的臭氧半衰期计算公式,研究表明臭氧半衰期与初始含量无关,只与环境舱大小、材料对臭氧的去除速率及自身分解速率有关.然而实验结果表明,臭氧半衰期随初始含量的不同呈有规律的变化,并分析了实验结果与理论模型存在差异的原因,提出臭氧半衰期应是初始含量、温湿度等多种因素的函数,即臭氧衰减系数除受材料对臭氧的去除率及臭氧自身分解速率影响之外,与含量有关并呈指数关系变化.

To study the behavior of the half life of ozone under normal temperature, the calculation formula of the half life of ozone in obturation cabin was obtained by revising the indoor chemical exposure model established by Swarlar under naturally attenuating condition. The formula indicated that the half life of ozone was independent of the initial concentration and only relative to the size of the cabin and the eliminating ozone rate of the material and the decomposition rate of the material itself. However, the experimental results showed that the half life of ozone varied with the initial concentration regularly. The reason for the difference between experimental results and theoretical model was analyzed. The half life of ozone should be a function of many factors, such as initial concentration, temperature and humidity. The attenuation coefficient of ozone determined by the eliminating ozone rate of the material and the decomposition rate of the material itself decreased with the concentration exponentially.