Mobilization of heavy metals from floodplain sediments of the Yellow River during redox fluctuations  

作　　者：Fuyu Xie Xiaoqing Li Qingxiang Yang Ying Meng Fubo Luan 

机构地区：[1]Key Laboratory of Drinking Water Science and Technology,Research Center for Eco-Environmental Sciences,Chinese Academy of Sciences,Beijing 100085,China [2]University of Chinese Academy of Sciences,Beijing 100049,China [3]College of Life Sciences,Henan Normal University,Xinxiang 453007,China

出　　处：《Journal of Environmental Sciences》2025年第4期432-439,共8页环境科学学报(英文版)

基　　金：supported by the National Key Research and Development Program of China(No.2022YFC3203604);the National Natural Science Foundation of China(Nos.51808541,and U1904205).

摘　　要：The floodplain of the Yellow River is a typical area characterized by redox fluctuations and heavy metal pollution.However,the mobilization behavior of heavy metals in floodplain sediments during redox fluctuations remains poorly understood.In this study,reductive mobilization of Fe and Mn was observed under reducing environments through reduction and dissolution,leading to the subsequent release of adsorbed As.In contrast,the mobilization of U occurred under oxic conditions,as the oxidative state of U(VI)has higher solubility.Furthermore,insignificant effects on the mobilization of Cd,Cu,Pb,and Hg were noticed during redox fluctuations,indicating higher stability of these heavymetals.Additionally,we demonstrated that carbon sources can play a key role in the mobilization of heavy metals in floodplain sediments,amplifying the reductive mobilization of Fe,Mn,As and the oxidative mobilization of U.Our findings contribute to the understanding of the biogeochemical cycling of heavy metal in floodplain sediments of the Yellow River and the factors that control this cycling.

关 键 词：Biogeochemical cycling Redox fluctuation Heavy metal Carbon supplementation The Yellow River 

分 类 号：X703[环境科学与工程—环境工程]