Diffusion process and risks of heavy metal(loid)s in an arid-region lake sediments: influencing factors and management suggestions
Li Y. Ma L. Wang J. Liu W. Abuduwaili J.
October 2025Academic Press
Journal of Environmental Management
2025#393
The release of heavy metal(loid)s (HMs) in lake sediments is highly sensitive to environmental conditions, and understanding its release process and influence mechanism is crucial for managing ecological risk in lakes. This study took Bosten Lake as a typical representative and integrated the methodological and technical system of passive sampling technology / DIFS model / Bayesian network model to analyze the process and influence mechanism of HMs release in the core microscopic system of lake overlying water - porewater – sediment core, and comparatively discussed the characteristics of HMs release in lake sediments in arid areas. In the surface sediments of Bosten Lake, Cr and Ni can reach a supply balance, with other elements continuously supplied from the solid to the liquid phases at different rates depending on the sampling areas. Cd posed the greatest potential ecological risk (RAC > 30, RSP > 3), and Zn had the greatest potential toxicity to aquatic organisms (RQ > 28.59), and the estuary area requires the most attention. The cation exchange in the overlying water and the adsorption/desorption properties of Fe and total organic carbon (TOC) in the sediments jointly controlled the ‘reactivation’ ability of HMs due to the saltwater characteristics of the overlying water in lakes in arid areas. These findings have promoted the understanding of the diffusion mechanism of HMs release from lake sediments in arid areas and provided references and support for the formulation of control strategies for endogenous metals pollution in these sediments.
Bayesian network model , DIFS model , Heavy metal , Lake sediment , Release risks
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State Key Laboratory of Ecological Safety and Sustainable Development in Arid Lands, Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Urumqi, 830011, China
Research Center for Ecology and Environment of Central Asia, Chinese Academy of Sciences, Urumqi, 830011, China
University of Chinese Academy of Sciences, Beijing, 100049, China
Xinjiang Key Laboratory of Water Cycle and Utilization in Arid Zone, Urumqi, 830011, China
China-Kazakhstan Joint Laboratory for Remote Sensing Technology and Application, Al-Farabi Kazakh National University, Almaty, 050012, Kazakhstan
State Key Laboratory of Ecological Safety and Sustainable Development in Arid Lands
Research Center for Ecology and Environment of Central Asia
University of Chinese Academy of Sciences
Xinjiang Key Laboratory of Water Cycle and Utilization in Arid Zone
China-Kazakhstan Joint Laboratory for Remote Sensing Technology and Application
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