Self-decomposition and half-life time of gaseous hypochlorous acid.

Journal of microorganism control Pub Date : 2023-01-01 DOI:10.4265/jmc.28.2_65

Tetsuyoshi Yamada, Takashi Muramatsu, Tatsuya Kiriyama, Satoshi Fukuzaki

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Abstract

The concentration of the indoor gaseous hypochlorous acid (HOCl _(g)) varied significantly during disinfection. The kinetics of self-decomposition of HOCl _(g) was studied at temperatures within the range of 10℃ to 40℃ and relative humidity between 30% RH and 90% RH in a lab-scale confined polyvinylidene fluoride gas bag space. The decay curve of HOCl _(g) , obtained by plotting the logarithm of the HOCl _(g) concentration against time, was analyzed using an integrated model that showed two simultaneous first-order processes. One process was assumed to be the adsorption of HOCl _(g) onto the gas bag surface, whereas the other was the self-decomposition of HOCl _^(g) in the gas space. The decay curve is reduced to the sum of two independent and simultaneous first-order processes. The decay rate constant for self-decomposition depended on temperature and relative humidity. The half-life time of HOCl _(g) was estimated to be between 76.9 h and 116 h depending on the temperature and relative humidity conditions.

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气态次氯酸的自分解和半衰期。

消毒过程中室内次氯酸(HOCl (g))浓度变化显著。在室温10 ~ 40℃、相对湿度30% ~ 90%的密闭聚偏氟乙烯气囊空间中，研究了HOCl (g)的自分解动力学。通过绘制HOCl (g)浓度随时间的对数得到HOCl (g)的衰减曲线，并使用一个同时显示两个一阶过程的集成模型进行分析。假设一个过程是HOCl (g)在气囊表面的吸附，另一个过程是HOCl (g)在气体空间中的自分解。衰减曲线被简化为两个独立且同时发生的一阶过程的和。自分解的衰变速率常数取决于温度和相对湿度。根据温度和相对湿度的不同，HOCl (g)的半衰期估计在76.9 ~ 116 h之间。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Journal of microorganism control

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