根据pH值对土壤中重金属流动性风险的高估:对土壤质量评估的影响
Yingdong Wu1, Zixin Zeng1, Rong Teng2
1Department of Environmental Science and Engineering, College of Architecture and Environment, Sichuan University, Chengdu 610065, PR China; Yibin Institute of Industrial Technology, Sichuan University, Yibin 644000, PR China.
Journal of hazardous materials
|December 12, 2025
概括
风险评估规范 (RAC) 可能高估了高pH的土壤重金属 (HM) 风险. 这项研究揭示了复杂的HM流动性-pH关系,提出了准确评估土壤质量的新框架.
科学领域:
- 环境化学环境化学
- 土壤科学 土壤科学
- 地质化学 地质化学
背景情况:
- 风险评估代码 (RAC) 使用Bureau Communautaire de Référence (BCR) 的酸可提取分数 (PF1) 来估计土壤重金属 (HM) 的移动性.
- 当PF1与pH增加时,RAC中存在潜在的pH依赖偏差,但PF1-pH关系尚不清楚.
研究的目的:
- 为了量化PF1和pH之间的关系,为八个HMs.
- 评估环境因素如何调节这些PF1-pH关系.
- 确定RAC的局限性,并为土壤HM风险评估提出改进建议.
主要方法:
- 综合了来自162项研究的5151个观察结果.
- 采用非参数统计,随机森林和夏普利添加式扩展 (SHAP).
- 分析了Cr,Fe,Mn,Pb,Zn,Cu,Cd和Ni的PF1-pH关系和环境因素调制.
主要成果:
- PF1随着Cr,Fe,Mn和Pb的pH增加;Zn的pH接近中性;Cu呈V形趋势;Cd和Ni的依赖性较弱.
- 年平均温度,降水,粘土和有机碳含量影响了特定HM的PF1-pH模式.
- RAC系统地高估了性土壤中的HM风险,由于PF1的上升,尽管移动性下降.
结论:
- PF1-pH关系是HM特异性的,受到环境因素的影响.
- RAC需要重新校准,以考虑pH依赖偏差和环境调制.
- 为了更准确地评估土壤HM风险,提出了一个概念分量-环境合框架.
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