解读土壤中重金属的污染风险,来源及其联系
Zhirou Zhang1, Shiqi Huang1, Haiyang Chen1
1Engineering Research Center of Groundwater Pollution Control and Remediation, Ministry of Education, College of Water Sciences, Beijing Normal University, No 19, Xinjiekouwai Street, Beijing 100875, China.
The Science of the total environment
|August 8, 2024
概括
这项研究确定了中国一个煤炭城市的重金属污染源,发现农业活动,大气沉积和工业排放是主要原因. 工业来源带来了最高的健康风险,指导了有针对性的缓解策略.
科学领域:
- 环境科学 环境科学
- 地质化学 地质化学
- 风险评估 风险评估
背景情况:
- 土壤中的重金属存在重大生态和健康风险.
- 了解污染源及其与风险的关系对于有效缓解至关重要.
- 现有的研究往往缺乏一种系统的方法来破译源-沉没关系,并将源分配与风险评估联系起来.
研究的目的:
- 提出和应用一个综合框架来描述污染风险,污染源及其在土壤金属中的相互联系.
- 为了比较评估先进的受体模型来分配土壤金属的来源.
- 用概率风险评估模型评估土壤金属对健康的特定来源风险.
主要方法:
- 地质化学评估和生态风险指数计算.
- 用多变量曲线分辨率加权交替最小方形 (MCR-ALS) 和多线性引擎2 (ME2) 接收器模型用于源分配的比较应用.
- 概率风险评估模型用于评估特定来源的健康风险.
主要成果:
- 土壤受到Cd,Hg,Cr,As和Pb的污染,Cd和Hg对生态构成重大风险.
- MCR-ALS和ME2确定了类似的来源:农业活动 (35.538.3%),大气沉积 (30.335.1%) 和工业排放 (26.634.1%).
- 工业排放对非致癌性和致癌性健康风险的贡献最大,尽管整体风险水平是可以接受或容忍的.
结论:
- 综合框架有效地描述了土壤金属污染,来源和风险.
- 工业活动是土壤重金属相关的健康风险的重要来源.
- 调查结果为有针对性的风险管理政策和全球理解源风险关系提供了准则.
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