Metal fluxes at the sediment–water interface in a free water surface constructed wetland

Xu, Xiaoyu; Baddar, Zeinah Elhaj

doi:10.1007/s10661-022-10258-7

Cited by 2 publications

(2 citation statements)

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“…Previous work performed at the H‐02 constructed wetland measured the ratio between bioavailable Cu and Zn concentrations in the sediment pore water (DGT s ) and the bioavailable concentrations in the overlaying water (DGT w ; Xu & Baddar, 2022). Though we have not performed such analysis, some findings are relevant to the present study.…”

Section: Resultsmentioning

confidence: 99%

“…Though we have not performed such analysis, some findings are relevant to the present study. The flux of Zn from the overlying water to the sediment pore water tended to be the dominant phenomenon for Zn ( ratio < 1) for all months except January, while the flux of Cu from the sediment pore water to the overlaying water ( ratio > 1) took place in February, March, April, and June (Xu & Baddar, 2022). The observations of the present study somewhat agree with those of the abovementioned study in that the resupply capacity of Cu from the sediment pore water to the overlying water is more likely for Cu and not for Zn.…”

Section: Resultsmentioning

confidence: 99%

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Spatiotemporal Changes in Trace Metal Bioavailability in the Sediment Pore water of a Constructed Wetland Using Passive Pore water Samplers

Elhaj Baddar,

Xu,

Spencer

2023

Enviro Toxic and Chemistry

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Sediments in aquatic systems often act as a major sink for contaminants. Diffusive gradient in thin films (DGTs) and in situ equilibrium dialysis samplers (peepers) are two major in situ porewater sampling devices that overcome the problems associated with conventional porewater sampling methods. In this study, DGTs and peepers were used to study the spatial and seasonal effects (cool months: October‐February, warm months: May‐September) on metal bioavailability in the H‐02 constructed wetland, and the sink vs. source role of the sediments by calculating the metal resupply capacity (R). Data showed similar seasonal trends in metal concentrations using both passive samplers, peepers and DGTs. Pooled Cu and Zn concentrations measured using DGTs were lower in warm months (1.67 ± 1.50 and 2.62 ± 0.68 μg.L‐1, respectively, p < 0.001) vs. (2.12 ± 0.65 and 5.58 ± 1.33 μg.L‐1, respectively, p < 0.001) in cool months (mean ± 95% Confidence Intervals). Sulfate (SO42‐) concentrations were significantly (p = 0.0139) lower in warm months (averaged at 0.22 ± 0.05 mg.L‐1) compared to (0.16 ± 0.05 mg.L‐1) in cool months. The increase in SO42‐ concentration is an indicator of the lower activity of sulfate reducing bacteria (SRB) which need SO42‐ during the anaerobic respiration, in which SO42‐ is reduced to sulfide (S2‐) which forms insoluble salts with Cu and Zn, which could partially explain higher bioavailability of these metals in the cool season. Metal resupply capacity of the sediments was mostly < 0.2 for Cu and Zn. Taken together, the H0‐2 wetland sediments mostly acted as a sink to both Cu and Zn over the course of this study.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%