In situ, high-resolution evidence of metals at the sediment-water interface under ice cover in a seasonal freezing lake

Abstract

The ice cover in winter as a physical barrier and duration would profoundly impact on changes in endogenous metal loading, migration, and transformation. Although a gradual reduction in duration and occurrence of lake ice cover in boreal lake ecosystems has been confirmed, little attention to the ice-covered period is received compared to open water studies. In this study, novel-developed diffusive gradients in thin films (DGT, ZrO-Chelex) probes were deployed to obtain the in-situ and high-resolution information on metals (Cu, Zn, Pb, Mn, Cd, Cr, and As) at the sediment-water interface (SWI) in a seasonal ice-covered lake, Chagan Lake. In addition, “source-sink” characteristics of each metal related to their endogenous release were determined based on Fick’s first law. Concentrations of labile metals at the SWI demonstrated significant spatial heterogeneity, peaking exactly below the SWI. Compared with other similar studies, concentrations of Pb (0.55 μg/L), Cr (0.58 μg/L), and As (2.4 μg/L) were a little higher even under-ice than that in other freshwater rivers and lakes, indicating potential pollution due to the agricultural intensification and petroleum extraction. The apparent diffusive fluxes suggested that sediments acted as a sink for Pb (−0.01 mg m–2 day–1), Cr (−2.37 mg m–2 day–1), and Cd (−0.1 mg m–2 day–1), diffusing from the overlying water into the sediment, while Cu (0.12 mg m–2 day–1), Zn (0.75 mg m–2 day–1), Mn (15.89 mg m–2 day–1), and As (2.12 mg m–2 day–1) as a source from sediments into the overlying water. Dissolved oxygen was the principal factor (79.5%, P = 0.032), determining the variation of the available metals at the SWI. As the urgent need for research focused on under-ice ecosystem dynamics, this study addressed the previously unknown behavior of the labile metals at the SWI and provided a unique perspective for the lake management during the ice-cover periods when external nutrient input was cut off.

In situ, high-resolution evidence for the release of heavy metals from lake sediments during ice-covered and free periods

“…In the LXK basin, the Mn concentration was observed to be notably high, 23 times greater than values recorded from a prior study of heavy metals at the SWI during ice-covered periods in the Chagan Lake (Yuan et al, 2022). This substantial Mn concentration suggests a predominance of natural lithogeochemical processes over anthropogenic sources and points to ongoing diagenetic processes in the LXK basin (Förstner et al, 1981;Yuan et al, 2014).…”

“…Turbulent flows enhance metal dispersion and interaction with sediment particles (Hayter and Gu, 2000). Resuspending sediments, especially in turbulence, alters sediment properties, affecting heavy TABLE 2 Comparation of metal concentrations (mg L −1 ) with other lakes (Sigg et al, 2006;Dragun et al, 2008;Huo et al, 2015;Wu et al, 2016;Wang et al, 2019;Yao et al, 2019;Yuan et al, 2022). metal distribution and promoting their release into the water.…”

“…The sediment-water interface (SWI) zone in lake ecosystems is a dynamic frontier characterized by significant vertical variations in physical and chemical parameters (Yuan et al, 2022). At this interface, mass transport and energy exchange constantly take place within confined spaces (Liu et al, 2022).…”