季铵盐在海水中的降解性

发布时间：2018-03-14 11:00

  本文选题：季铵盐　切入点：生物降解　出处：《海洋环境科学》2016年02期 　论文类型：期刊论文

【摘要】：以天然海水为实验介质,研究了季铵盐的生物降解、光降解和水解特性。结果表明,季铵盐的生物降解速率与水样含菌量相关,降解曲线呈阶梯三段式,中段细菌因受季铵盐杀灭/抑制作用含菌量降低,导致季铵盐的降解趋缓,192 h的降解率为8.93%。不同光源和温度对季铵盐的光降解速率和水解速率影响较大,kuv/kvis=188,k40℃/k20℃=4.58。季铵盐的降解主要由光降解贡献,20℃时自然光降解的k分别是生物降解和水解的1.96和4.5倍。季铵盐在海水中的生物降解、自然光降解和水解动力学均符合一级动力学模型,20℃时其速率常数k分别为0.00046、0.0009和0.0002,半衰期t1/2分别为62.8 d、32.1 d和126.0 d,降解半衰期较长,在海洋环境中的残留持久性需重视。
[Abstract]:The biodegradation, photodegradation and hydrolysis characteristics of quaternary ammonium salt were studied in natural seawater. The results showed that the biodegradation rate of quaternary ammonium salt was related to the bacterial content of water sample, and the degradation curve was a step by step. In the middle part of the bacteria, the amount of bacteria killed / inhibited by quaternary ammonium salt decreased, The degradation rate of quaternary ammonium salt is 8.93.The photodegradation rate and hydrolysis rate of quaternary ammonium salt are greatly affected by different light source and temperature. The degradation of quaternary ammonium salt is mainly contributed by the natural light drop at 20 鈩，

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