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Nitrogen-Rich Organic Matter Formation and Stabilization in Iron Ore Tailings: A Submicrometer Investigation

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Download Hi-Res ImageDownload to MS-PowerPointCite This:Environ. Sci. Technol. 2023, 57, 33, 12325-12338
    Bioremediation and Biotechnology

    Nitrogen-Rich Organic Matter Formation and Stabilization in Iron Ore Tailings: A Submicrometer Investigation
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    • Songlin Wu
      Songlin Wu
      Centre for Mined Land Rehabilitation, Sustainable Minerals Institute, The University of Queensland, Brisbane, Queensland 4072, Australia
      State Key Laboratory of Urban and Regional Ecology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China
      More by Songlin Wu
      Orcidhttps://orcid.org/0000-0001-7469-5253
    • Jeremy Bougoure
      Jeremy Bougoure
      Centre for Microscopy, Characterisation and Analysis, University of Western Australia, 35 Stirling Highway, Crawley 6009, Australia
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    • Jian Wang
      Jian Wang
      Canadian Light Source Inc., University of Saskatchewan, Saskatoon, Saskatchewan S7N 2V3, Canada
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    • Lars Thomsen
      Lars Thomsen
      Australian Synchrotron, ANSTO, 800 Blackburn Road, Clayton, Victoria 3168, Australia
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    • Ting-Shan Chan
      Ting-Shan Chan
      National Synchrotron Radiation Research Centre, Hsinchu Science Park, Hsinchu 30092, Taiwan
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    • Qing Yi
      Qing Yi
      Centre for Mined Land Rehabilitation, Sustainable Minerals Institute, The University of Queensland, Brisbane, Queensland 4072, Australia
      More by Qing Yi
      Orcidhttps://orcid.org/0000-0002-1604-7853
    • Zhen Li
      Zhen Li
      Centre for Mined Land Rehabilitation, Sustainable Minerals Institute, The University of Queensland, Brisbane, Queensland 4072, Australia
      More by Zhen Li
    • Gordon Southam
      Gordon Southam
      School of Earth & Environmental Sciences, The University of Queensland, Brisbane, Queensland 4072, Australia
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    • Longbin Huang*
      Longbin Huang
      Centre for Mined Land Rehabilitation, Sustainable Minerals Institute, The University of Queensland, Brisbane, Queensland 4072, Australia
      *Email: [email protected]. Phone: +61 7 3346 3130. Fax: +61 7 3346 4056.
      More by Longbin Huang
      Orcidhttps://orcid.org/0000-0001-5024-0107
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    Environmental Science & Technology

    Cite this: Environ. Sci. Technol. 2023, 57, 33, 12325–12338
    Click to copy citationCitation copied!
    https://doi.org/10.1021/acs.est.3c03011
    Published August 13, 2023
    Copyright © 2023 American Chemical Society
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    Abstract

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    Organic matter (OM) formation and stabilization are critical processes in the eco-engineered pedogenesis of Fe ore tailings, but the underlying mechanisms are unclear. The present 12 month microcosm study has adopted nanoscale secondary ion mass spectrometry (NanoSIMS) and synchrotron-based scanning transmission X-ray microscopy (STXM) techniques to investigate OM formation, molecular signature, and stabilization in tailings at micro- and nanometer scales. In this system, microbial processing of exogenous isotopically labeled OM demonstrated that 13C labeled glucose and 13C/15N labeled plant biomass were decomposed, regenerated, and associated with Fe-rich minerals in a heterogeneous pattern in tailings. Particularly, when tailings were amended with plant biomass, the 15N-rich microbially derived OM was generated and bound to minerals to form an internal organo-mineral association, facilitating further OM stabilization. The organo-mineral associations were primarily underpinned by interactions of carboxyl, amide, aromatic, and/or aliphatic groups with weathered mineral products derived from biotite-like minerals in fresh tailings (i.e., with Fe2+ and Fe3+) or with Fe3+ oxyhydroxides in aged tailings. The study revealed microbial OM generation and subsequent organo-mineral association in Fe ore tailings at the submicrometer scale during early stages of eco-engineered pedogenesis, providing a basis for the development of microbial based technologies toward tailings’ ecological rehabilitation.

    Copyright © 2023 American Chemical Society

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    Supporting Information

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    The Supporting Information is available free of charge at https://pubs.acs.org/doi/10.1021/acs.est.3c03011.

    • Additional details of methods and additional results, including methods for microbial activities, labile OM extraction, density fractionation, C 1s NEXAFS, ATR-FTIR spectroscopy, Fe K edge XAFS, NanoSIMS, BSE-SEM-EDS, and STXM-NEXAFS analyses, as well as results of STXM-NEXAFS, XRD, ATR-FTIR spectroscopy, microbial respiration rates, TOC: TN ratio, C1 s NEXAFS spectral fitting, Fe K edge XAFS, Fe L edge, Al K edge, and Si K edge NEXAFS spectra, BSE-SEM-EDS, and NanoSIMS (PDF)

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    Cited By

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    This article is cited by 2 publications.

    1. Yifan Jiang, Ziying Zhang, Jun Jiang, Feng Zhu, Xuyao Guo, Pu Jia, Hongzhe Li, Zhongkai Liu, Shiwei Huang, Yufei Zhang, Shengguo Xue. Enhancement of nitrogen on core taxa recruitment by Penicillium oxalicum stimulated microbially-driven soil formation in bauxite residue. Journal of Hazardous Materials 2024, 473 , 134647. https://doi.org/10.1016/j.jhazmat.2024.134647
    2. Songlin Wu, Kurt O. Konhauser, Baodong Chen, Longbin Huang. “Reactive Mineral Sink” drives soil organic matter dynamics and stabilization. npj Materials Sustainability 2023, 1 (1) https://doi.org/10.1038/s44296-023-00003-7
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    Environmental Science & Technology

    Cite this: Environ. Sci. Technol. 2023, 57, 33, 12325–12338
    Click to copy citationCitation copied!
    https://doi.org/10.1021/acs.est.3c03011
    Published August 13, 2023
    Copyright © 2023 American Chemical Society
    Request reuse permissions

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