在沉积物再移动过程中Cu和Pb的动态以及对沿海水质的相关风险
Nicolas Layglon1, Véronique Lenoble2, Erwan Tessier3
1Université de Toulon, Aix Marseille Univ., CNRS, IRD, MIO, Toulon, France; Univ. Bordeaux, CNRS, Bordeaux INP, EPOC, UMR 5805, F-33600 Pessac, France.
The Science of the total environment
|November 11, 2024
概括
沉积物再悬浮实验揭示了不同的金属转移动态. 铜 (Cu) 吸附然后解吸,而 (Pb) 解吸然后吸附,影响沿海水质和海洋物种保护.
科学领域:
- 环境化学环境化学
- 海洋科学 海洋科学
- 地质化学 地质化学
背景情况:
- 沿海沉积物充当铜 (Cu) 和 (Pb) 等金属的储存库.
- 沉积物再悬浮事件可以重新调动这些金属,影响水质.
- 了解金属分离和转移动态对于沿海生态系统管理至关重要.
研究的目的:
- 研究沉积物中的金属度和分离如何影响金属转移动态.
- 为了检查沉积物再悬浮过程中溶解的Cu和Pb的释放和去除.
- 评估重新悬浮的颗粒量对溶解金属度的影响.
主要方法:
- 实验室再悬浮实验使用三个不同的沉积物和海水.
- 监测溶解的Cu和Pb度超过360小时,颗粒度为2.5g L-1.1.
- 评估不同沉积物:水比对24h (Pb) 和360h (Cu) 后金属转移的影响.
主要成果:
- Cu最初被吸附在颗粒上,然后再被脱离,而Pb最初被脱离,然后被吸附在颗粒上.
- 金属转移动态在实验之间显示了类似的模式,但转移幅度是沉积物特定的.
- 再悬浮颗粒的增加导致非线性溶解Cu释放超过保护触发值和溶解Pb的钟形曲线,表明Pb对颗粒的亲和力.
结论:
- 沉积物特性在重悬浮事件期间显著影响金属转移动态.
- 重复悬浮可能导致Cu的环境质量标准被超越,对海洋生物构成风险.
- Pb对粒子具有强烈的亲和力,其溶解度以非线性方式受到粒子负载的影响.
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