一种基于定量离子特征-活性关系 (QICAR) 的新方法来预测大米中的生物度因子,加上可解释的机器学习
Yifei Gao1, Wenhao Zhao2, Xuedong Wang3
1State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing, 100012, China; College of Resource Environment and Tourism, Capital Normal University, Beijing, 100048, China.
这项研究引入了一种新的定量离子特性-活性关系 (QICAR) 模型,用于预测大米中的重金属积累. 该模型使用土壤和金属特性准确预测生物度因子,增强食品安全评估.
科学领域:
- 环境科学 环境科学
- 农业科学 农业科学
- 计算化学的计算化学
背景情况:
- 农业土壤中的重金属 (HM) 是大米安全的一个主要问题.
- 传统的生物度因子 (BCF) 测量是昂贵且耗时的.
- 有机污染物的定量结构-活性关系 (QSAR) 已经确立,但植物中无机污染物的定量离子特性-活性关系 (QICAR) 尚未得到探索.
研究的目的:
- 开发和验证QICAR模型,用于预测大米中的重金属生物度因子 (BCF).
- 评估机器学习算法在QICAR模拟无机污染物的有效性.
- 确定影响大米中重金属积累的关键土壤和金属特性.
主要方法:
- 使用了529个土壤-大米样本的数据集.
- 使用了三个机器学习算法:随机森林 (RF),CatBoost (CAT) 和XGBoost (XGB).
- 输入特征包括土壤和金属的物理化学特性.
主要成果:
- 开发了高精度的QICAR模型,用于预测大米中的重金属BCF.
- 最好的CatBoost模型获得了R2 = 0.91和MAE = 0.1916.
- 确定软度指数 (Σp) 作为一个关键因素,对HM缩产生值影响.
结论:
- QICAR模型,特别是使用CatBoost的模型,可以准确地预测大米中的重金属BCF.
- 最少的输入特征 (1-2 种金属特性 + 土壤特性) 足以实现高精度.
- 该模型为农产品安全的风险评估和决策提供了科学基础,正如海南岛所证明的那样.
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