Microscale Investigations of Soil Heterogeneity: Impacts on Zinc Retention and Uptake in Zinc-Contaminated Soils

Rosenfeld, Carla E.; Chaney, Rufus L.; Tappero, Ryan V.; Martinez, Carmen E.

doi:10.2134/jeq2016.05.0184

Title: Microscale Investigations of Soil Heterogeneity: Impacts on Zinc Retention and Uptake in Zinc-Contaminated Soils

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Abstract

Metal contaminants in soils can persist for millennia, causing lasting negative impacts on local ecosystems. Long‐term contaminant bioavailability is related to soil pH and to the strength and stability of solid‐phase associations. We combined physical density separation with synchrotron‐based microspectroscopy to reduce solid‐phase complexity and to study Zn speciation in field‐contaminated soils. We also investigated Zn uptake in two Zn‐hyperaccumulating ecotypes of Noccaea caerulescens (Ganges and Prayon). Soils were either moderately contaminated (500–800 mg Zn kg ⁻¹ via contaminated biosolids application) or grossly enriched (26,000 mg Zn kg ⁻¹ via geogenic enrichment). Soils were separated using sodium polytungstate into three fractions: light fraction (LF) (<1.6 g cm ⁻³ ), medium fraction (MF) (1.6–2.8 g cm ⁻³ ), and heavy fraction (HF) (>2.8 g cm ⁻³ ). Approximately 45% of the total Zn was associated with MF in biosolids‐contaminated soils. From these data, we infer redistribution to the MF after biosolids application because Zn in biosolids is principally associated with HF and LF. Our results suggest that increasing proportions of HF‐associated Zn in soils may be related to greater relative Zn removal by Zn hyperaccumulating plants. Using density fractions enabled assessment of Zn speciation on a microscale despite incomplete fractionation. Analyzingmore »« less

Authors:

Rosenfeld, Carla E. ^[1]; Chaney, Rufus L. ^[2]; Tappero, Ryan V. ^[3]; Martinez, Carmen E. ^[4]

The Pennsylvania State Univ., University Park, PA (United States); Univ. of Minnesota - Twin Cities, St. Paul, MN (United States)
USDA-ARS, Beltsville, MD (United States)
Brookhaven National Lab. (BNL), Upton, NY (United States)
The Pennsylvania State Univ., University Park, PA (United States); Cornell Univ., Ithaca, NY (United States)

Publication Date:: Fri Mar 17 00:00:00 EDT 2017

Research Org.:: Brookhaven National Laboratory (BNL), Upton, NY (United States)

Sponsoring Org.:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

OSTI Identifier:: 1434763

Alternate Identifier(s):: OSTI ID: 1582111

Report Number(s):: BNL-203475-2018-JAAM
Journal ID: ISSN 0047-2425

Grant/Contract Number:: SC0012704; DE‐FG02‐92ER14244

Resource Type:: Accepted Manuscript

Journal Name:: Journal of Environmental Quality

Additional Journal Information:: Journal Volume: 46; Journal Issue: 2; Journal ID: ISSN 0047-2425

Publisher:: American Society of Agronomy, Crop Science Society of America, and Soil Science Society of America

Country of Publication:: United States

Language:: English

Subject:: 36 MATERIALS SCIENCE

Citation Formats


                    Rosenfeld, Carla E., Chaney, Rufus L., Tappero, Ryan V., and Martinez, Carmen E. Microscale Investigations of Soil Heterogeneity: Impacts on Zinc Retention and Uptake in Zinc-Contaminated Soils.  United States: N. p., 2017. 
Web.  doi:10.2134/jeq2016.05.0184.

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                    Rosenfeld, Carla E., Chaney, Rufus L., Tappero, Ryan V., & Martinez, Carmen E. Microscale Investigations of Soil Heterogeneity: Impacts on Zinc Retention and Uptake in Zinc-Contaminated Soils.  United States.  https://doi.org/10.2134/jeq2016.05.0184

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                    Rosenfeld, Carla E., Chaney, Rufus L., Tappero, Ryan V., and Martinez, Carmen E. Fri .  
"Microscale Investigations of Soil Heterogeneity: Impacts on Zinc Retention and Uptake in Zinc-Contaminated Soils".  United States.  https://doi.org/10.2134/jeq2016.05.0184.  https://www.osti.gov/servlets/purl/1434763.

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@article{osti_1434763,

  title        = {Microscale Investigations of Soil Heterogeneity: Impacts on Zinc Retention and Uptake in Zinc-Contaminated Soils},

  author       = {Rosenfeld, Carla E. and Chaney, Rufus L. and Tappero, Ryan V. and Martinez, Carmen E.},

  abstractNote = {Metal contaminants in soils can persist for millennia, causing lasting negative impacts on local ecosystems. Long‐term contaminant bioavailability is related to soil pH and to the strength and stability of solid‐phase associations. We combined physical density separation with synchrotron‐based microspectroscopy to reduce solid‐phase complexity and to study Zn speciation in field‐contaminated soils. We also investigated Zn uptake in two Zn‐hyperaccumulating ecotypes of Noccaea caerulescens (Ganges and Prayon). Soils were either moderately contaminated (500–800 mg Zn kg −1 via contaminated biosolids application) or grossly enriched (26,000 mg Zn kg −1 via geogenic enrichment). Soils were separated using sodium polytungstate into three fractions: light fraction (LF) (<1.6 g cm −3 ), medium fraction (MF) (1.6–2.8 g cm −3 ), and heavy fraction (HF) (>2.8 g cm −3 ). Approximately 45% of the total Zn was associated with MF in biosolids‐contaminated soils. From these data, we infer redistribution to the MF after biosolids application because Zn in biosolids is principally associated with HF and LF. Our results suggest that increasing proportions of HF‐associated Zn in soils may be related to greater relative Zn removal by Zn hyperaccumulating plants. Using density fractions enabled assessment of Zn speciation on a microscale despite incomplete fractionation. Analyzing both density fractions and whole soils revealed certain phases (e.g., ZnS, Zn coprecipitated with Fe oxides) that were not obvious in all analyses, indicating multiple views of the same soils enable a more complete understanding of Zn speciation. Core Ideas Ice embedding is a preferable method to prepare thin sections for μXAS analysis. Soil phases essential for retaining Zn may be obscured in complex samples. Zn removal is soil dependent and does not match well with single parameters. Zn redistribution can occur over decades after contamination. Solid phase Zn redistribution can continually alter Zn bioavailability.},

  doi          = {10.2134/jeq2016.05.0184},

  journal      = {Journal of Environmental Quality},

  number       = 2,

  volume       = 46,

  place        = {United States},

  year         = {Fri Mar 17 00:00:00 EDT 2017},

  month        = {Fri Mar 17 00:00:00 EDT 2017}

}

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