沿海沉积物的重金属 (化物) 污染在多面的人为压力下:基于地化学基线和源相关风险的见解
Zexing Kuang1, Huijuan Wang1, Beibei Han2
1Department of Environmental Science and Engineering, Fudan University, Shanghai, 200438, China; Guangdong Provincial Key Laboratory of Fishery Ecology and Environment, South China Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences, Guangzhou, 510300, China.
Chemosphere
|July 29, 2023
概括
这项研究确定了大雅湾重金属化物 (HMs) 的地化学基线值 (GBVs),揭示人为来源构成最大的生态风险. Cd和Hg需要优先管理以减轻沿海污染热点.
科学领域:
- 环境化学环境化学
- 地质化学 地质化学
- 海洋污染 海洋污染
背景情况:
- 沉积物异质性导致污染和风险评估中的偏见.
- 背景值的空间变化往往被忽视.
- 量化源生态风险评估需要可靠的基线数据.
研究的目的:
- 为了确定大雅湾重金属化物 (HMs) 的地化学基线值 (GBVs).
- 进行量化源生态风险评估.
- 确定污染源并优先考虑管理策略.
主要方法:
- 累积频率分布 (CFD) 曲线用于确定GBV.
- 主要组件分析 (PCA) 和正矩阵分解 (PMF) 用于来源分配.
- 源特定的生态风险评估和空间分布分析.
主要成果:
- 确定了7个HM (Cu,Pb,Zn,Cd,Cr,As,Hg) 的GBV,这表明沿海沉积物的陆地起源.
- 确定了三个主要来源:自然过程 (51.7%),人为影响 (29.2%) 和特定来源 (19.1%).
- 人为源 (F2+F3) 为生态风险贡献了73.8%,其中Cd和Hg是优先污染物.
结论:
- 人类活动显著推动了大雅湾的重金属 (化物) 污染和生态风险.
- 由于它们具有很高的污染潜力,Cd和Hg需要立即管理注意.
- 针对性地管理海上交通和工业点源对于沿海环境保护至关重要.
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