稀土元素作为在极端干旱事件 (亚马逊中部) 期间内格罗河沉积物中的新兴污染物
Gabriela Santos Caldeira1, Pedro Costa Evangelistaa2, Mariana Melo Lage1
1Department of Chemistry, Universidade Federal de Minas Gerais, Belo Horizonte, Minas Gerais, Brazil.
Environmental pollution (Barking, Essex : 1987)
|February 1, 2026
概括
亚马逊地区的极端干旱
科学领域:
- 环境科学 环境科学
- 地质化学 地质化学
- 生态毒理学 生态毒理学
背景情况:
- 亚马逊盆地面临着不断加剧的极端气候事件,特别是2023年严重的干旱影响了尼格罗河.
- 像尼格罗河这样的酸性,有机丰富的黑水系统在干旱期间容易受到地化学变化的影响.
- 稀土元素 (REEs) 是新出现的污染物和关键的地化学痕迹.
研究的目的:
- 在极端干旱期间,分析黑河沉积物中的REE分布和分化.
- 评估与受影响沉积物中REE积累相关的生态风险.
- 建立在尼格罗河系统中REEs的地化学基线.
主要方法:
- 从Anavilhanas群岛和马纳乌斯收集了沉积物样本.
- 在表面和轮沉积物中分析了REE度和分离模式.
- 潜在生态风险指数 (PERI) 用于对生态风险进行评估.
主要成果:
- 阿纳维尔哈纳斯沉积物显示低REE度和自然分离模式.
- 马纳乌斯沉积物,特别是暴露的沉积物,呈现出较高的REEs,LREE/HREE丰富度和阳性异常,表明氧化和人为影响.
- 确定了中度的生态风险,与电子废物和工业活动相关的特定 REE.
结论:
- 人类输入,可能来自电子废物,有助于REE在马纳乌斯沉积物中的积累.
- 该研究提供了在严重干旱期间内格罗河沉积物中首次REE评估,突出了气候变化影响.
- 在因气候变化和污染而受到压力的亚马逊流域,对 REE 监测和监管有着至关重要的需要.
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