<br>可溶性有机质（DOM）在塑造长江重金属分布格局中的作用,Journal of Hazardous Materials

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可溶性有机质（DOM）在塑造长江重金属分布格局中的作用
Journal of Hazardous Materials ( IF 12.2 ) Pub Date : 2023-08-26 , DOI: 10.1016/j.jhazmat.2023.132410
Enhang Liang ₁ , Jiarui Li ₁ , Bin Li ₁ , Shufeng Liu ₁ , Ruoqi Ma ₂ , Shanqing Yang ₁ , Hetong Cai ₁ , Zehuan Xue ₁ , Ting Wang ₁

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溶解有机物（DOM）强烈影响重金属的固液分配和迁移特性，但人们对 DOM 参与大型河流系统中的金属分布和风险知之甚少。本研究调查了 14 种重金属和 DOM 在整个长江（超过 6000 km）的时空分布，强调了 DOM 在调控重金属环境行为中的关键作用。观察到金属含量的显著空间变化，河流源头和下游与中上游截然不同。长江重金属主要来源于自然来源，人为干扰较小。我们发现 DOM 可以促进金属从固相向液相的转化，具有较高芳香性的 DOM 表现出更高的金属亲和力。虽然长江地区生态风险较低，但金属浸出的潜在风险值得关注，尤其是 DOM 含量和芳香性较高的中下游地区的 As、Cd 和 Sb。本研究建立了一种从源头到海洋的调查方法，以评估 DOM 特征对金属分区的影响，这对于大型河流的风险控制和可持续管理至关重要。

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Roles of dissolved organic matter (DOM) in shaping the distribution pattern of heavy metal in the Yangtze River

Dissolved organic matter (DOM) strongly influences the solid-liquid partitioning and migration characteristics of heavy metals, yet little is known about the metal distribution and risk with the participation of DOM in large riverine systems. This study investigated the spatiotemporal distribution of 14 heavy metals and DOM along the entire Yangtze River (over 6000 km), and highlighted the critical roles of DOM in regulating the environmental behaviors of heavy metals. Significant spatial variations of metal contents were observed, with the river source and lower reach remarkably different from the upper-middle reaches. Heavy metals in the Yangtze River were mainly from the natural sources with minor anthropogenic disturbance. We found DOM could promote the conversion of metals from solid to liquid phase and DOM with higher aromaticity showed higher metal affinities. Although low ecological risks were observed in the Yangtze River, potential risks of metal leaching warrant attention, especially for As, Cd and Sb in the middle-lower reaches with higher DOM content and aromaticity. This study established a source-to-sea investigative approach to evaluate the influences of DOM features on metal partitioning, which is crucial for the risk control and sustainable management of large rivers.

更新日期：2023-08-26

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