Dynamics of metal immobilization in coastal mariculture sediments: Insights from DGT and DIFS modeling
文献类型： 外文期刊
作者： Gu, Yang-Guang 1 ; Gao, Yanpeng 2 ; Jordan, Richard W. 3 ; Jiang, Shi-Jun 4 ;
作者机构： 1.Chinese Acad Fishery Sci, South China Sea Fisheries Res Inst, Guangzhou 510300, Peoples R China
2.Guangdong Univ Technol, Inst Environm Hlth & Pollut Control, Guangzhou 510006, Peoples R China
3.Yamagata Univ, Fac Sci, Yamagata 9908560, Japan
4.Hainan Univ, State Key Lab Marine Resource Utilizat South China, Haikou 570228, Peoples R China
5.Guangdong Prov Key Lab Fishery Ecol & Environm, Guangzhou 510300, Peoples R China
6.Minist Agr & Rural Affairs, Key Lab Open Sea Fishery Dev, Guangzhou 510300, Peoples R China
关键词： Metals; Diffusive gradients in thin films (DGT); Kinetic modeling; Metal immobilization; Ecological risk; Zhelin Bay
期刊名称：ENVIRONMENTAL POLLUTION （ 影响因子：7.3； 五年影响因子：8.1 ）
ISSN： 0269-7491
年卷期： 2025 年 383 卷
页码：
收录情况： SCI
摘要： Coastal sediments play a crucial role in regulating the mobility and bioavailability of metals in marine ecosystems, especially in aquaculture-dominated environments. This study conducted a dynamic assessment of metal release in the sediments of Zhelin Bay, the largest seawater aquaculture region in eastern Guangdong, China, using Diffusive Gradients in Thin Films (DGT) technology and the DGT Induced Fluxes in Sediments (DIFS) model. The distribution patterns of time-dependent R values for ten metals (Al, Cr, Mn, Fe, Co, Ni, Cu, Zn, Cd, and Pb) were analyzed alongside the adsorption (Kf) and desorption (Kb) parameters to elucidate the mechanisms by which metals are immobilized in sediments, limiting their release into the water column. Both the timedependent R value patterns and Kf/Kb ratios demonstrated that all ten metals exhibited varying degrees of stabilization within the sediment, confirming their immobilization mechanisms in place. The maximum total concentration of Zn reached 347.82 mg/kg, corresponding to a moderate pollution level based on the geoaccumulation index. DGT-labile metals posed a joint ecological risk probability of 27.30 %, mainly due to Mn (11.19 %) and Al (11.15 %). These findings suggest that aquaculture activities and terrestrial nutrient inputs contribute to organic matter accumulation and biogeochemical shifts in sediments, influencing metal stabilization. This study is among the first to quantitatively characterize the dynamics of metal immobilization in coastal mariculture sediments using a combined DGT-DIFS approach.
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