弥合微观动力学和宏观命运:一种分子动力学-机器学习方法,用于预测PFAS在土壤和沉积物中的固体-液体分布.
Letian Zhang1,2, Chaozhong Tan1,2, Zhouyun Xie1,2
1College of Environmental Science and Engineering, Hunan University, Changsha 410082, P.R.china.
Environmental science & technology
|January 26, 2026
概括
一个新的框架通过整合分子动力学和机器学习来提高对 perfluoroalkyl 和 polyfluoroalkyl 物质 (PFAS) 环境流动性的预测. 这种方法提高了对这些持久污染物的建模准确度.
科学领域:
- 环境化学环境化学
- 计算化学计算化学
- 环境科学 环境科学
背景情况:
- 和多醇基物质 (PFAS) 是持续的全球污染物.
- 预测PFAS的环境命运和流动性是一项挑战.
- 现有的PFAS流动性的机器学习模型往往忽略了水化学效应.
研究的目的:
- 开发一种新的多尺度方法,即Phys-ML Sorp框架,将分子动力学 (MD) 模拟与机器学习 (ML) 整合起来.
- 为了提高PFAS固体液体分布系数 (logKd) 的预测准确度.
- 将物理信息的微观特征纳入ML模型,以改进环境风险评估.
主要方法:
- 来自MD模拟的量化微观特征:旋转半径 (Rg),溶剂可访问的表面积 (SASA).
- 开发了一个新的有效活动系数 (logγ),使用MD衍生的Rg和扩展的Debye-Hückel方程.
- 将这些特征集成到一个ML模型中,该模型是根据499个PFAS在纯水和CaCl2系统中的分离观测进行训练的.
主要成果:
- 物理MLSORP框架实现了卓越的预测性能 (RPD=2.90,RMSE=0.32).
- 与仅使用宏观参数的模型相比,结合MD衍生的显微特征可以提高RPD14.62%并减少RMSE13.52%.
- SHAP分析确定了分子量,SASA,logKow,Rg和logγ作为影响PFAS分区的关键因素.
结论:
- Phys-ML Sorp框架为预测PFAS环境流动性提供了一种强大的,机械上知情的方法.
- 这种多尺度方法显著提高了logKd预测的准确性,解决了当前ML模型的局限性.
- 该框架为环境污染物建模和风险评估提供了改进的能力.
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