Consistent controls on trace metal micronutrient speciation in wetland soils and stream sediments

Yan, Jinshu; Sharma, Neha; Flynn, Elaine D.; Giammar, Daniel E.; Schwartz, Grace; Brooks, Scott C.; Weisenhorn, Pamela; Kemner, Kenneth M.; O’Loughlin, Edward J.; Kaplan, Daniel I.; Catalano, Jeffrey G.

doi:10.1016/j.gca.2021.10.017

Cited by 10 publications

(50 citation statements)

References 120 publications

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“…The mineralogy at all of the studied sites is dominated by quartz, with variations in minor phases (Yan et al, 2021). The total organic carbon content of aquatic systems varies with location: the marsh wetland site (Marsh 1) contained the highest carbon content (9.0%), whereas Stream 2 exhibited the lowest carbon content (0.5%) (Table S2).…”

Section: Characterization Of Soils and Sedimentsmentioning

confidence: 99%

“…To investigate the effect of Cu on denitrification, we selected three separate natural aquatic systems: marsh wetlands at Argonne National Laboratory (ANL) in Lemont, Illinois; riparian wetlands in the Tims Branch (TB) watershed at the Savannah River Site in Aiken County, South Carolina; and East Fork Poplar Creek (EFPC) at Oak Ridge National Laboratory (ORNL) in Oak Ridge, Tennessee. Detailed information on the sampling sites, sampling techniques, and soil characterization can be found in our recent study on trace metal speciation at these sites (Yan et al, 2021). Briefly, soil/sediment and surface water samples were collected from two different locations at each aquatic system.…”

Section: Description Of Sitesmentioning

confidence: 99%

“…The unacidified water samples were used to measure the concentrations of dissolved anions (Br -, Cl -, F -, and SO4 2-) using a Thermo Scientific Dionex Integrion high-pressure ion chromatograph (IC) with a conductivity detector. The major elements and trace metals were extracted from the soils/sediments by microwave-assisted digestion and were analyzed using ICP-OES and ICP-MS, respectively (Yan et al, 2021). The extractable nutrients (nitrate, ammonium, and phosphate) in the soils and sediments were obtained using a 2 M potassium chloride extraction method adapted from previous studies (Sparks et al, 1996;Pansu and Gautheyrou, 2006) and were measured using a Seal Analytical AQ300 Discrete Multi-Chemistry Analyzer.…”

Section: Sampling and Characterizationmentioning

confidence: 99%

“…The two locations in riparian wetland soils and stream sediments had different total carbon, sulfur, and metal contents and exhibited different solid-phase speciation of Cu. Both the locations in the marsh wetland soils showed similar characteristics (Yan et al, 2021), so the samples from only one marsh wetland location (Marsh 1) were used in further studies. Cu uptake experiments were performed to determine the Cu concentration range to consider in the incubation studies.…”

Section: Laboratory Incubation Experimentsmentioning

confidence: 99%

“…Both the surface water samples, and the soils and sediments were characterized to determine their total carbon, sulfur, metals, and nutrient concentrations. The detailed results are presented in our recent study focused on trace metal micronutrient speciation in wetland soils and stream sediments (Yan et al, 2021).…”

Section: Characterization Of Soils and Sedimentsmentioning

confidence: 99%

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Copper availability governs nitrous oxide accumulation in wetland soils and stream sediments

Sharma¹,

Flynn²,

Catalano³

et al. 2021

Preprint

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Denitrification is microbially-mediated through enzymes containing metal cofactors. Laboratory studies of pure cultures have highlighted that the availability of Cu, required for the multicopper enzyme nitrous oxide reductase, can limit N2O reduction. However, in natural aquatic systems, such as wetlands and hyporheic zones in stream beds, the role of Cu in controlling denitrification remains incompletely understood. In this study, we collected soils and sediments from three natural environments -- riparian wetlands, marsh wetlands, and a stream -- to investigate their nitrogen species transformation activity at background Cu levels and different supplemented Cu loadings. All of the systems displayed low solid-phase associated Cu (40 - 280 nmol g-1), which made them appropriate sites for evaluating the effect of limited Cu availability on denitrification. In laboratory incubation experiments, high concentrations of N2O accumulated in all microcosms lacking Cu amendment except for one stream sediment sample. With Cu added to provide dissolved concentrations at trace levels (10-300 nM), reduction of N2O to N2 in the wetland soils and stream sediments was enhanced. A kinetic model could account for the trends in nitrogen species by combining the reactions for microbial reduction of NO3- to NO2-/N2O/N2 and abiotic reduction of NO2- to N2. The model revealed that the rate of N2O to N2 conversion increased significantly in the presence of Cu. For riparian wetland soils and stream sediments, the kinetic model also suggested that overall denitrification is driven by abiotic reduction of NO2- in the presence of inorganic electron donors. This study demonstrated that natural aquatic systems containing Cu at concentrations less than or equal to crustal abundances may display incomplete reduction of N2O to N2 that would cause N2O accumulation and release to the atmosphere.

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Section: Characterization Of Soils and Sedimentsmentioning

confidence: 99%

Section: Description Of Sitesmentioning

confidence: 99%

Section: Sampling and Characterizationmentioning

confidence: 99%

Section: Laboratory Incubation Experimentsmentioning

confidence: 99%

Section: Characterization Of Soils and Sedimentsmentioning

confidence: 99%

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