甲酸单的水解动力学预测模型:一个密度功能理论研究研究
Tong Xu1, Jingwen Chen2, Deming Xia2
1College of Environmental Science and Engineering, Hebei University of Science and Technology, Shijiazhuang 050000, China; Key Laboratory of Industrial Ecology and Environmental Engineering (Ministry of Education), School of Environmental Science and Technology, Dalian University of Technology, Dalian 116024, China.
甲酸单 (MPE) 是一种持续性环境污染物. 这项研究揭示了它们的水解动力学,显示了从几分钟到79年的半衰期,这对于了解水生持久性至关重要.
科学领域:
- 环境化学环境化学
- 计算化学计算化学
- 毒理学 毒理学 毒理学
背景情况:
- 甲酸单 (MPE) 是甲酸的初级降解产物.
- 在水生环境中,MPE普遍存在,并引发了毒理学的担忧.
- 了解MPE水解动力学对于评估它们在环境中的持久性至关重要.
研究的目的:
- 为了研究18个MPE的基催化和中性水解的动力学.
- 确定影响MPE水解速率的因素.
- 开发一个模型来预测MPE水解动力学.
主要方法:
- 使用密度函数理论 (DFT) 的计算.
- 研究了18个MPE的水解动力学,这些MPE具有不同的离开组.
- 开发了一个定量结构-活动关系 (QSAR) 模型.
主要成果:
- 离开组 (pKa < 10) 的MPE倾向于分离的过渡状态.
- 甲酸的持久性比它们的母甲酸 Ester 的持久性要大.
- 对于MPE,计算的水解半衰期从3.4分钟到79.2年 (pH7-9).
结论:
- MPE的水解动力学受到离开组的pKa和MPE电子负性的影响.
- 大型企业表现出显著的环境持久性.
- 这项研究为了解水生系统中的MPE命运提供了理论基础.
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