Dynamic Responses of Trace Metal Bioaccessibility to Fluctuating Redox Conditions in Wetland Soils and Stream Sediments

Sharma, Neha; Wang, Zixuan; Catalano, Jeffrey G.; Giammar, Daniel E.

doi:10.1021/acsearthspacechem.2c00031

Cited by 15 publications

(8 citation statements)

References 111 publications

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“…Our speciation results can be extrapolated to other anoxic systems with low organic matter and sulfur contents; however, natural aquatic systems with different mineral compositions will yield different speciation. In oxic systems or systems prone to redox fluctuations, dissolution of sulfides, oxidation of organic matter, and formation of Fe and Mn (hyr)oxides takes place upon introduction of oxygen. ,,,, Under these oxic conditions, trace metals bound to sulfides and organic matter could be mobilized into the dissolved phase, and these metals and others could adsorb onto freshly formed Fe and Mn (hydr)oxides. ,, …”

Section: Resultsmentioning

confidence: 99%

“…16,19,35,53,72 Under these oxic conditions, trace metals bound to sulfides and organic matter could be mobilized into the dissolved phase, and these metals and others could adsorb onto freshly formed Fe and Mn (hydr)oxides. 56,73,74 Implications of Solid−Water Metal Partitioning for Biogeochemical Processes. The metal partitioning trends indicated that the studied aquatic systems might lack sufficient Cu and Ni (shaded regions in Figure 4a,b) required for optimal performance of biogeochemical processes.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

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Solid–Water Partitioning and Speciation of Trace Metal Micronutrients in Wetland Soils and Stream Sediments

Sharma

Yan

Flynn

et al. 2023

ACS Earth Space Chem.

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The solid-phase speciation of metals plays a crucial role in determining their bioavailability in aquatic ecosystems. The interactions of metals with metal (hydr)oxides, sulfides, clays, and organic matter govern their availability in subsurface environments. Our study combined solid−water partitioning experiments under anaerobic conditions (97% N 2 and 3% H 2 ) for 24 h and synchrotron-based spectroscopy to determine the factors controlling copper, nickel, and zinc availability in soils and sediments from three different natural aquatic systems. While soils and sediments from all three systems strongly bound added trace metals, there were substantial differences in trace metal partitioning trends between different sites, especially for Cu. There was no distinct correlation between trace metal partitioning and the total organic matter, iron, and sulfur contents of the samples. X-ray absorption spectroscopy indicated that the speciation of the freshly added metals taken up by the solids differs substantially from the speciation of the metals originally present in unamended samples. Cu sulfides dominated speciation at low loadings (1 μmol Cu/g solid), whereas complexation to thiol groups and formation of metallic Cu governed speciation at high loadings (10 μmol Cu/g solid). For Ni and Zn, adsorption to mineral surfaces and organic matter governed their speciation in materials from most sites at low (1 μmol Zn/g solid) and high (10 μmol Zn/g solid) loadings. Under the evaluated time scale (24 h), the background speciation of metals in natural aquatic systems is a poor predictor of the speciation and lability of metals introduced from anthropogenic or natural processes. Our findings imply that geochemical processes controlling trace metal speciation may vary considerably with metal loading in different natural systems.

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Section: Resultsmentioning

confidence: 99%

Section: ■ Results and Discussionmentioning

confidence: 99%

Solid–Water Partitioning and Speciation of Trace Metal Micronutrients in Wetland Soils and Stream Sediments

Sharma

Yan

Flynn

et al. 2023

ACS Earth Space Chem.

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“…For example, if a persistent, sulfidic anoxic microsite were to become oxic, local acidification would transpire, which in turn alters soil weathering and nutrient, contaminant, and OC mobility. Regular redox fluctuations in sulfidic soils can drive pulses of contaminant release with subsequent cycles releasing more contaminant metals depending on the substrate. − …”

Section: Influence Of Anoxic Microsites On Biogeochemical Cyclesmentioning

confidence: 99%

“…Regular redox fluctuations in sulfidic soils can drive pulses of contaminant release with subsequent cycles releasing more contaminant metals depending on the substrate. 172 − 174 …”

Section: Influence Of Anoxic Microsites On Biogeochemical Cyclesmentioning

confidence: 99%

Consider the Anoxic Microsite: Acknowledging and Appreciating Spatiotemporal Redox Heterogeneity in Soils and Sediments

Lacroix,

Aeppli,

Boye

et al. 2023

ACS Earth Space Chem.

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Reduction–oxidation (redox) reactions underlie essentially all biogeochemical cycles. Like most soil properties and processes, redox is spatiotemporally heterogeneous. However, unlike other soil features, redox heterogeneity has yet to be incorporated into mainstream conceptualizations of soil biogeochemistry. Anoxic microsites, the defining feature of redox heterogeneity in bulk oxic soils and sediments, are zones of oxygen depletion in otherwise oxic environments. In this review, we suggest that anoxic microsites represent a critical component of soil function and that appreciating anoxic microsites promises to advance our understanding of soil and sediment biogeochemistry. In sections 1 and 2, we define anoxic microsites and highlight their dynamic properties, specifically anoxic microsite distribution, redox gradient magnitude, and temporality. In section 3, we describe the influence of anoxic microsites on several key elemental cycles, organic carbon, nitrogen, iron, manganese, and sulfur. In section 4, we evaluate methods for identifying and characterizing anoxic microsites, and in section 5, we highlight past and current approaches to modeling anoxic microsites. Finally, in section 6, we suggest steps for incorporating anoxic microsites and redox heterogeneities more broadly into our understanding of soils and sediments.

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“…The activity of Mn and Fe decreases 100-fold for each unit that increases soil pH (Lindsay, 1978). Many studies have found that soil pH is negatively correlated with Fe content [6], [60,61]. The availability of the micronutrients Fe and Mn decreases with increasing soil pH due to the hydrolysis reactions (by the splitting of water molecules in their hydration shells) (Sinskey, 2009).…”

Section: Relationship Between Available Micronutrients and Some Soil ...mentioning

confidence: 99%

Impact of Topography on Soil Properties in Delboatwaro Subwatershed, Southern Ethiopia

Gebrehanna¹,

Beyene

Abera

2022

AJSSPN

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Soil characterization and classification are prerequisites for better agricultural productivity and sustainable soil fertility management. This study was previously conducted to characterize and classify DelboAtwaro, a watershed in southern Ethiopia. Three pedons classes were inspected and three representative pits (pedons) opened, i.e. one in each pedon. Pedons were described in accordance with FAO [1] and WRB (2014) in the study area, and then soil samples were collected from recognized horizons of each pedon and analyzed for selected physicochemical properties. The pedons confirmed the variability of the physical, chemical and morphological properties of the soils in the study area. Based on the result of field and laboratory soil analysis, the soil structure was early clay in both aboveground and subterranean strata. The soil chemical reaction used to be somewhat acidic to neutral in reaction (pH 6.1-7.0). The organic carbon (OC) content varied between 1.23 and 1.78% between the respective topographical positions. The cationexchange capacity (CEC) of the soils ranged from 39.8 to 79.9 cmol (+) kg-1 (intermediate to optimal), while the percent base saturation (PBS) ranged from 23.7 to 40.7%. The dominance of the exchangeable bases was once, in descending order, Ca>Mg>K>Na. Soils ranged from low to optimal in TN and very low to low in available P, while the concentrations of micronutrients in the soils were best (Fe), very high (Mn), adequate (Zn), and optimum (Cu). The soil had a molly epipedon with humic diagnostic houses in the subsurface. Hence the soil was categorized as Rhodic Nitisols (Haplic) (US, MS, and LS) according to the WRB for soil resources. In general, slope and land use influenced soil properties in the different topographical locations of the Delbo Atwaro Underwater Catchment, suggesting the need for integrated soil fertility management to sustainably conserve soil organic matter and nutrients.

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Dynamic Responses of Trace Metal Bioaccessibility to Fluctuating Redox Conditions in Wetland Soils and Stream Sediments

Cited by 15 publications

References 111 publications

Solid–Water Partitioning and Speciation of Trace Metal Micronutrients in Wetland Soils and Stream Sediments

Solid–Water Partitioning and Speciation of Trace Metal Micronutrients in Wetland Soils and Stream Sediments

Consider the Anoxic Microsite: Acknowledging and Appreciating Spatiotemporal Redox Heterogeneity in Soils and Sediments

Impact of Topography on Soil Properties in Delboatwaro Subwatershed, Southern Ethiopia

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