蛇河水电水库综合体上方的源和预算
Austin K Baldwin1, Sarah E Janssen2, Michael T Tate2
1U.S. Geological Survey, Idaho Water Science Center, United States of America.
The Science of the total environment
|October 21, 2023
概括
这项研究表明,支流和灌排水是蛇河中 (Hg) 和甲基 (MeHg) 的主要来源. 流中甲基化也是一个重要的,以前未被识别的MeHg来源.
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:
- 了解 (Hg) 和甲基 (MeHg) 的来源对于管理Hg受损水体至关重要.
- 描述河流中的Hg输入和甲基化过程是复杂的,特别是在半干旱地区.
研究的目的:
- 为了确定无机Hg和MeHg度和负载在164公里长的蛇河.
- 使用水质数据和Hg稳定同位素比率,创建一个全面的Hg源预算.
- 确定对Hg物种动员和运输的关键控制.
主要方法:
- 对无机Hg和MeHg进行现场采样 (过和颗粒物分量).
- 水质测量 (溪流流量,悬浮固体总量,溶解有机碳).
- 稳定的同位素分析用于来源分配.
- 对灌回流贡献的分析.
主要成果:
- 主要的支流贡献了不成比例的高负载的无机Hg和MeHg.
- 灌回流管提供40-50%的颗粒无机Hg负载.
- 河内和河岸甲基化是显著的,以前未被识别的MeHg来源.
- 溪流,悬浮固体,溶解的有机碳和农业用地覆盖面都会影响Hg的运输.
结论:
- 支流和灌回流是研究的蛇河范围内的无机Hg和MeHg的主要来源.
- 河流内甲基化对MeHg负载有显著的贡献,突出了其在半干旱河流系统中的重要性.
- 这些发现对于为管理策略提供信息,以减少生物群中的Hg负担至关重要.
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