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Heavy Metal Accumulation and Release Risks in Sediments from Groundwater–River Water Interaction Zones in a Contaminated River under Restoration
ACS Earth and Space Chemistry ( IF 3.4 ) Pub Date : 2020-11-23 , DOI: 10.1021/acsearthspacechem.0c00261
Guangci Zeng 1, 2 , Kai Yu 2 , Junying Li 2 , Wenxian Wu 2 , Han Qiao 2 , Yanhua Duan 2 , Chongxuan Liu 2
Affiliation  

This study investigated the accumulation and release risks of heavy metals As, Cd, Co, Cr, Cu, Ni, Pb, and Zn in representative contaminated river-bed and river-side sediments from a groundwater–river water interaction zone (GRIZ) currently under restoration. The results revealed different accumulation and release risk behaviors of the heavy metals in the river-bed and river-side sediments that are a complex function of contamination history, local hydrogeological and chemical properties, and metal-specific chemistry. In the river-bed sediments, the concentrations of all the metals first increased and then decreased with depth, reflecting the histories of metal-containing wastewater discharges and sedimentation of metal-containing particles in river water. In the river-side sediments, the concentrations of As, Cd, Co, and Pb were higher in finer grain materials, while those of Cr, Cu, Ni, and Zn were higher in coarser materials, reflecting the combined effects of stronger sorption capacity in finer materials and preferential water flow in coarser materials that carried metals from contaminated river. Speciation analysis indicated that Cd was mainly controlled by surface complexation, Cu was mainly controlled in complexation with organics, and other metals dominantly associated with iron-oxide and structural fractions with a higher structural fraction in the river-side sediments. Risk analysis indicated that release potentials were metal-specific, following an order of Cd > Cu > Ni > Cr > Co > Zn > As > Pb. The results have a strong implication for understanding heavy-metal distribution and accumulation in GRIZ sediments and for the management of contaminated sediments during and after watershed restoration.

中文翻译:

恢复过程中受污染河流中地下水与河流水相互作用区的沉积物中重金属的积累和释放风险

这项研究调查了目前地下水-河流水相互作用区(GRIZ)中代表性的受污染河床和河边沉积物中重金属As,Cd,Co,Cr,Cu,Ni,Pb和Zn的积累和释放风险。正在恢复中。结果表明,河床和河床沉积物中重金属的不同积累和释放风险行为是污染物历史,当地水文地质和化学性质以及金属特异性化学的复杂函数。在河床沉积物中,所有金属的浓度先随深度增加而后降低,这反映了含金属废水排放和含金属颗粒在河水中沉淀的历史。在河边沉积物中,As,Cd,Co,较细的颗粒材料中的Pb和Pb较高,而较粗的颗粒中的Cr,Cu,Ni和Zn较高,这反映了较细的材料具有更强的吸附能力和载运来自受污染河水的金属的较粗的材料优先流动的综合作用。 。形态分析表明,Cd主要受表面络合控制,Cu主要受有机物络合控制,其他金属主要与氧化铁有关,而河床沉积物中的结构分数较高。风险分析表明释放电位是金属特异性的,顺序为Cd> Cu> Ni> Cr> Co> Zn> As> Pb。
更新日期:2020-12-17
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