Abstract
Purpose
Mercury (Hg) and methylmercury (MeHg) are easily released from sediments to overlying water and cause secondary contamination. In general, Hg concentrations are low in natural aquatic environments, but Hg toxicity is high. Therefore, it is important to assess the mobility and release risks of Hg and MeHg from surface sediment using in situ high-resolution sampling techniques.
Methods
The profile distribution of Hg and MeHg was obtained for samples from Weishan sub-lake (WL) and Dushan sub-lake (DL) of Nansi Lake, China, by high-resolution dialysis (HR-Peeper probes) and the diffusive gradients in thin films (DGT) technique at mm-resolution. Furthermore, Hg mobility and release risks in sediments were evaluated by combining BCR (European Community Reference Bureau) extraction and DGT-measured data.
Results
The soluble concentrations of Hg in surface sediments in WL and DL were 21.70 and 19.38 ng L−1 and the DGT-labile concentration of Hg were 8.21 and 10.30 ng L−1, respectively. The soluble and labile Hg and MeHg concentrations were higher in the surface sediments (from −40 to 0 mm) than in deep sediments. The distribution of the labile-Hg was controlled by the ferrimanganic (hydr)oxide and total nitrogen rather than organic carbon content. The non-residual components accounted for a greater proportion of the interface, which further confirmed Hg was more active on the surface layer of the sediment. The resupply ability indicated that the release of Hg from sediment was insufficient to maintain the initial concentration in the porewater before consumption. The MeHg fluxes in WL (6.18 ng m−2 day−1) were twice those in DL (2.89 ng m−2 day−1), and the risk assessment code revealed a higher risk in the surface layer (25.21–61.88%) than in the deep layer (0–27.75%).
Conclusions
Dissolved Hg and MeHg accumulated on the surface of the sediments and were more active than in the deeper sediments. The DGT-labile state can be used for a better understanding of the bioavailability and mobility of Hg. The diffusion direction of Hg and MeHg was from sediment to the overlying water. The release risks of Hg and MeHg from surface sediments (especially in WL) were found to be worthy of concern.
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Data availability
The experimental data on which this manuscript is based can be obtained, on request, from the corresponding author (youngliyuan@126.com).
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Funding
This study was cofounded by the Key R&D plan of Shandong province in 2019 (Public Welfare Project) (2019GSF110016) and Major Water Conservancy Research and technology promotion projects in Shandong Province (SDSLKY201008-01).
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Zhang, M., Li, C., Ma, X. et al. Evaluating the mercury distribution and release risks in sediments using high-resolution technology in Nansi Lake, China. J Soils Sediments 21, 3466–3478 (2021). https://doi.org/10.1007/s11368-021-02994-z
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DOI: https://doi.org/10.1007/s11368-021-02994-z