堤建设对甲基化和生物积累的影响,由稳定的同位素揭示出来
Young-Gwang Kim1, Ji Won Yoon1, Sujin Kang2
1Division of Environmental Science and Engineering, Pohang University of Science and Technology, Pohang, 37673, Republic of Korea.
Environmental pollution (Barking, Essex : 1987)
|March 5, 2025
概括
堤建设显著改变了韩国河口的 (Hg) 循环,减少了总Hg,但增加了甲基 (MeHg) 和转移来源. 这影响了贝类和鱼类中的Hg生物积累.
科学领域:
- 环境化学环境化学
- 地质化学 地质化学
- 生态毒理学 生态毒理学
背景情况:
- 韩国河口的大型水和建设项目 (1978-1990) 旨在改变河流与河口的接口.
- 这些项目可能会影响 (Hg) 在沿海生态系统中的生态化学循环和生物积累.
研究的目的:
- 调查水建设对 (Hg) 源,生物地球化学循环和韩国西海岸河口生物积累的影响.
- 了解这些环境变化导致的长期生物地质化学变化.
主要方法:
- 在河口沉积芯中分析总Hg (THg) 和甲基 (MeHg) 度.
- 稳定Hg同位素分析 (Δ199Hg, Δ200Hg, δ202Hg) 用于确定Hg来源.
- 稳定碳同位素和n-alkane分析以评估有机物质来源.
- 提取和分析四个地化学池.
- 在贝类和鱼类组织中分析THg.
主要成果:
- 在水/下游观察到总Hg (THg) 的显著降低 (74%) 和甲基 (MeHg) 的大幅增加 (536%).
- Hg来源从河流出口转移到湿沉积,以 Δ199Hg 和 Δ200Hg 的正转移表示.
- 增加了不稳定和有机结合的Hg分量的比例,有利于海洋有机物质的利用.
- 贝类的THg降低 (96%) 和鱼类的THg增加 (106%) 与增强的甲基化有关.
- 负的 δ202Hg 转移与 MeHg 峰值相关,表明 Hg 甲基化过程的变化.
结论:
- 和堤的建造深刻地改变了河口生态系统中的Hg生物可用性和甲基化.
- 源的转移和甲基化增加增加了在水生食物网中的生物积累.
- 环境影响评估必须考虑基础设施项目造成的复杂,长期的生物地质化学变化.
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