在臭氧化过程中甲醇的动力常数和转化产物
Siyan Fan1, Haiyang Xu1, Qiqi Zhang1
1School of Environmental Science and Engineering, Nanjing Tech University, Nanjing, 211816, China.
Chemosphere
|December 3, 2023
概括
在水中的奥尼达 (ONZ) 与臭氧和基激素发生反应. 臭氧化副产品可能比ONZ更有毒,影响水生生态系统.
科学领域:
- 环境化学环境化学
- 水处理技术水处理技术
- 生态毒理学 生态毒理学
背景情况:
- 奥尼达 (ONZ) 是一种尼特罗伊米达抗生素,是水生环境中的污染物.
- 臭氧化是一种有前途的技术,用于去除新出现的污染物.
- 关于臭氧化过程中的ONZ反应动力学和转化产品的数据有限.
研究的目的:
- 为了确定ONZ与臭氧和基基的反应动力学.
- 识别和分析在臭氧化过程中形成的ONZ转化产物 (TP).
- 评估ONZ及其TP的毒性.
主要方法:
- 使用过度臭氧和竞争方法测量了明显的二次运动常数.
- 基速率常数是使用Rct概念与甲基酸计算的.
- 在不同的pH值下使用HPLC-MS/MS分析了转化产品.
- 使用T.E.S.T.进行了TP的毒性预测. 一个工具. 工具.
- 使用呼吸计评估TP混合物的毒性.
主要成果:
- 对于ONZ与臭氧的二次速率常数在pH 7.0下为103.8±2.7 M−1s−1.
- 具有HO•的ONZ的第二阶速率常数为4.65 × 109 M−1s−1.1.
- 在pH11时发现了独特的TP,包括胺和N-氧化物.
- 在21个已识别的TP中,62%的TP显示出可能比ONZ有更高的毒性.
- 来自HO•丰富条件的TP显示出毒性略低于O3主导条件的TP.
结论:
- 这项研究为设计ONZ臭氧化过程提供了关键的动态数据.
- 对ONZ的臭氧化产生具有潜在显著生态毒理影响的TP.
- 了解TP毒性对于管理水生生态系统中的ONZ污染至关重要.
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