通过混合方法在空间随机场中的有毒金属的量化异质来源分配
Xufeng Fei1, Zhaohan Lou2, Meiling Sheng1
1Zhejiang Academy of Agricultural Sciences, Hangzhou, China; Key Laboratory of Information Traceability of Agriculture Products, Ministry of Agriculture and Rural Affairs, China.
Journal of hazardous materials
|January 17, 2024
概括
这项研究引入了一种新的混合方法,用于识别土壤中有毒金属污染源. 该方法准确地确定了农业活动和工业过程等主要贡献者,这些对保障粮食安全和人类健康至关重要.
科学领域:
- 环境科学 环境科学
- 地质化学 地质化学
- 污染控制 污染控制
背景情况:
- 土壤中的有毒金属对粮食安全和人类健康构成重大风险.
- 准确的来源分配对于有效的污染预防策略至关重要.
研究的目的:
- 开发和验证一种新的混合方法,用于在空间随机场中探索有毒金属污染源的异质性.
- 提高有毒金属来源分配和预测的准确性.
主要方法:
- 一种混合方法,结合了正矩阵分解 (PMF),贝叶斯最大 (BME) 和整合性可预测性标准 (IPC).
- 在土壤样本中应用识别和量化有毒金属来源的方法.
主要成果:
- 确定了 (Cd), (As) 和铜 (Cu) 是主要的土壤污染物,其超标率分别为27%,12%和11%.
- 混合方法在结合主要和所有来源时显示出对有毒金属的更高的预测准确度 (44%和46%的改进).
- 主要来源包括燃煤 (Hg),交通排放 (Pb, Zn),工业活动 (As),农业活动 (Cd, Cu) 和自然资源 (Cr, Ni).
- 非主要来源,如北方的工业活动 (Ni,Pb,Zn) 和南方的自然来源 (Cd,Cu,As,Pb,Zn),对区域污染产生重大影响.
结论:
- 新的混合方法为空间随机场中的有毒金属来源分配提供了一种优越的方法.
- 虽然主要来源是主要贡献者,但对于有针对性的污染控制,必须考虑非主要和本地来源对区域有毒金属积累的影响.
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