Sink or source? Insights into the behavior of copper and zinc in the sediment porewater of a constructed wetland by peepers

Qin, Chongyang; Xu, Xiaoyu; Peck, Erin

doi:10.1016/j.scitotenv.2022.153127

Cited by 8 publications

(7 citation statements)

References 45 publications

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“…Preparation of dialysis peepers followed the procedure described by Qin et al (2022), which involved submerging several 15-ml metal-free centrifuge tubes (Labcon North America, Petaluma, CA), which are the peepers; several perforated caps to allow for liquid exchange; and 5 × 5-cm filter pieces of 0.45 µm pore size (Millipore, Burlington, MA) in a water bath filled with deoxygenated Milli-Q water (ThermoFisher, Waltham, MA). Deoxygenation was performed using a continuous flow of nitrogen gas throughout the preparation of peepers.…”

Section: Preparation Of Passive Samplersmentioning

confidence: 99%

“…To provide a stable holder for the peepers and the DGTs during deployment, we used a setup similar to that described elsewhere with a few modifications (Qin et al, 2022). We used a polyvinyl chloride (PVC) housing pipe (8.8 cm diameter × 103 cm length) to hold the peepers, with five evenly spaced staggered holes, distributed over a length of 15 cm.…”

Section: Preparation Of Passive Samplersmentioning

confidence: 99%

“…Despite their role as a sink, the sediments in the constructed wetland system could act as a source of metals through the remobilization of metals (Nedrich & Burton, 2017; Qin et al, 2022). Therefore, calculating R also helps in understanding which role the sediments are playing.…”

Section: Introductionmentioning

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: Preparation Of Passive Samplersmentioning

confidence: 99%

Section: Preparation Of Passive Samplersmentioning

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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“…The sediment porewater was sampled using the peeper device designed by Pesch et al [54], Serbst et al [37], analyzed by Bufflap and Allen [55] and Brown and Caldwell [56], and modified by Qin et al [57], as shown in Figure S1. One peeper device consisted of a polyvinyl chloride pipe (height: 102 cm; diameter: 8.9 cm) with 8 peeper vials (metal-free plastic vials; capacity: 50 mL; VWR International; Radnor, PA, USA) inserted at 4.0 cm intervals.…”

Section: Sediment Porewatermentioning

confidence: 99%

“…Deoxygenated water from the bath was used to fill each vial. The opening of the vial was covered with one membrane disk, secured with strings to keep the membrane in place, and closed with the perforated cap [57]. The assembled peeper vials were inspected to confirm that the edges of the membrane disks were secured and no air bubbles were retained.…”

Section: Sediment Porewatermentioning

confidence: 99%

Mercury Accumulation in a Stream Ecosystem: Linking Labile Mercury in Sediment Porewaters to Bioaccumulative Mercury in Trophic Webs

Bryan

Parks

et al. 2022

Water

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Mercury (Hg) deposition and accumulation in the abiotic and biotic environments of a stream ecosystem were studied. This study aimed to link labile Hg in porewater to bioaccumulative Hg in biota. Sediment cores, porewaters, and biota were sampled from four sites along the Fourmile Branch (SC, USA) and measured for total Hg (THg) and methyl-Hg (MHg) concentrations. Water quality parameters were also measured at the sediment–water interface (SWI) to model the Hg speciation. In general, Hg concentrations in porewaters and bulk sediment were relatively high, and most of the sediment Hg was in the solid phase as non-labile species. Surface sediment presented higher Hg concentrations than the medium and bottom layers. Mercury methylation and MHg production in the sediment was primarily influenced by sulfate levels, since positive correlations were observed between sulfate and Hg in the porewaters. The majority of Hg species at the SWI were in non-labile form, and the dominant labile Hg species was complexed with dissolved organic carbon. MHg concentrations in the aquatic food web biomagnified with trophic levels (biofilm, invertebrates, and fish), increasing by 3.31 times per trophic level. Based on the derived data, a modified MHg magnification model was established to estimate the Hg bioaccumulation at any trophic level using Hg concentrations in the abiotic environment (i.e., porewater).

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Geochemistry of pore water

Chuang,

Erhardt,

Abbott

2024

Reference Module in Earth Systems and Environmental Sciences

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Sink or source? Insights into the behavior of copper and zinc in the sediment porewater of a constructed wetland by peepers

Cited by 8 publications

References 45 publications

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

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

Mercury Accumulation in a Stream Ecosystem: Linking Labile Mercury in Sediment Porewaters to Bioaccumulative Mercury in Trophic Webs

Geochemistry of pore water

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