State Key Laboratory of Pollution Control and Resource Reuse, College of Environmental Science and Engineering, Tongji University, Shanghai 200092, China; National Engineering Laboratory for Lake Pollution Control and Ecological Restoration, Chinese Research Academy of Environmental Sciences, Beijing 100012, China.
College of Environmental Science and Engineering, Donghua University, Shanghai 201620, China; National Engineering Laboratory for Lake Pollution Control and Ecological Restoration, Chinese Research Academy of Environmental Sciences, Beijing 100012, China.
J Environ Sci (China). 2025 Mar;149:278-287. doi: 10.1016/j.jes.2024.01.031. Epub 2024 Feb 10.
The arsenic (As) release from sediments in great lakes is affected by various factors. In this study, the characteristics of As release from sediments was investigated, and the As sources and sinks with the strengths in sediments from different areas (grass-type, algae-type, and grass-algae alternation areas) in great shallow lakes (Taihu Lake, China) were analyzed, and the influence of P competition in the process of As release was also studied. The results showed that changing trend of the values of equilibrium As concentration in sediments were consistent with the regional changes (0 to 28.12 µg/L), and the sediments from algae-type areas had the higher values. The sediments from western lake and northwest lake bay were a strong As and a weak P source, and the north lake bay had the opposite trend of these two regions. Intense P source competition with As from the sediments occurred in algae-type areas. The grass-type areas had strong As and P retention capacities, indicating a sink role of sediment with high As and P sorption capacities. The degree of As and P saturation had similar trend in sediments, and the grass-type areas had the higher values, 18.3%-21.4% and 15.31%-20.34%, respectively. Contribution analysis results showed that most of As release contribution was from the bottom (30-50 cm) sediments, and the surface (0-10 cm) sediments from algae-type areas contributed more to the overlying water than other region.
湖泊沉积物中砷的释放受多种因素影响。本研究调查了沉积物中砷的释放特征，分析了不同区域（草型、藻型和草藻交替区）大浅湖（中国太湖）沉积物中砷的来源和汇，并研究了磷竞争对砷释放过程的影响。结果表明，沉积物中平衡砷浓度值的变化趋势与区域变化一致（0 至 28.12μg/L），藻型区沉积物的砷浓度值较高。西部湖区和西北湖区的沉积物是砷的强源和磷的弱源，而北湖区则与这两个区域相反。藻型区沉积物中砷与磷的竞争非常激烈。草型区具有较强的砷和磷保留能力，表明具有高砷和高磷吸附能力的沉积物具有汇的作用。沉积物中砷和磷的饱和度具有相似的趋势，草型区的砷和磷饱和度分别为 18.3%-21.4%和 15.31%-20.34%。贡献分析结果表明，大部分砷释放贡献来自底部（30-50cm）沉积物，而藻型区的表层（0-10cm）沉积物对表层水的贡献大于其他区域。
