分析典型的地地区地表土壤中的来源:人类输入的贡献和大气运输的影响
Zhe Liu1, Guangyi Sun2, Xian Wu3
1State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550081, China; School of Earth Sciences, China University of Geosciences, Wuhan 430074, China.
Journal of hazardous materials
|February 6, 2026
概括
石地区土壤中的 (Cd) 污染很高,即使在偏远地区,金属炼和交通等人为来源也为此做出了重大贡献. 远程大气运输在Cd沉积中起着关键作用,因此需要将其纳入污染管理战略.
科学领域:
- 环境地质化学环境地质化学
- 土壤科学 土壤科学
- 同位素地球化学 同位素地球化学
背景情况:
- 卡斯特地区经常表现出土壤 (Cd) 丰富,归因于基岩气候变化.
- 在这些地区,人为Cd源的定量贡献尚不清楚,这阻碍了有效的污染管理.
- 了解Cd源对于制定地地景观中的有针对性的环境保护战略至关重要.
研究的目的:
- 为了确定和量化土壤 (Cd) 的来源,在一个典型的石地区.
- 区分天然基岩气候变化和人类对土壤Cd丰富的贡献.
- 评估大气中远程传输对偏远的地地区Cd污染的影响.
主要方法:
- 高场强度元素 (HFSEs) 和稀土元素 (REEs) 的综合分析.
- 积极矩阵因子化 (PMF) 模型用于源分配的应用.
- 稳定 (Cd) 同位素分析 (δ114/110Cd) 以追踪污染来源.
主要成果:
- 在研究的地地区,土壤中Cd度明显超过了中国的土壤风险控制标准.
- 在山地土壤中,基岩气候变化是主要来源 (55.0%),其次是金属炼 (19.8%),交通 (18.8%) 和煤炭燃烧 (6.4%).
- 在农业土壤中,人为来源占主导地位 (72.9%),包括金属炼,交通,煤炭燃烧和肥料应用,基岩贡献了27.1%.
结论:
- 人类活动,特别是金属炼,交通和煤炭燃烧,是土壤Cd污染的重要贡献者,即使在远离城市中心的卡斯特地区.
- 远程大气运输有效地将Cd输送到偏远的土壤,强调需要将这种途径纳入风险评估.
- 综合地质化学和同位素方法为全球类似环境中的重金属来源分配和污染控制提供了强大的框架.
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