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Stabilization of Natural Organic Matter by Short-Range-Order Iron Hydroxides. | LitMetric

Stabilization of Natural Organic Matter by Short-Range-Order Iron Hydroxides.

Environ Sci Technol

Division of Environmental Studies, Graduate School of Frontier Sciences, The University of Tokyo, 332 Building of Environmental Studies, 5-1-5 Kashiwanoha, Kashiwa City, Chiba 277-8563, Japan.

Published: December 2016

AI Article Synopsis

  • * The study investigated the structural characteristics of these DOM/Fe mixtures under various pH levels and carbon-to-iron ratios using advanced analytical techniques.
  • * Findings revealed that higher carbon ratios lead to stronger bonding between carbon and iron, influencing the structural stability and solubilization of these co-precipitates, ultimately affecting the carbon and iron cycles in soil ecosystems.

Article Abstract

Dissolved organic matter (DOM) is capable of modifying the surfaces of soil minerals (e.g., Fe hydroxides) or even forming stable co-precipitates with Fe(III) in a neutral environment. The DOM/Fe co-precipitation may alter biogeochemical carbon cycling in soils if the relatively mobile DOM is sorbed by soil minerals against leaching, runoff, and biodegradation. In this study, we aimed to determine the structural development of DOM/Fe co-precipitates in relation to changes in pH and C/(C + Fe) ratios using XRD, XPS, Fe K-edge XAS, FTIR, and C-NEXAFS techniques. The results showed that in the system with bulk C/(C + Fe) molar ratios ≤0.65, the ferrihydrite-like Fe domains were precipitated as the core and covered by the C shells. When the C/(C + Fe) molar ratio ranged between 0.71 and 0.89, the emerging Fe-C bonding suggested a more substantial association between Fe domains including edge- and corner-sharing FeO octahedra and DOM. With C/(C + Fe) bulk molar ratios ≥0.92, only corner-sharing FeO octahedra along with Fe-C bonding were found. The homogeneously distributed C and Fe domains caused the enhancement of Fe and C solubilization from co-precipitates. The C/(C + Fe) ratios dominated structural compositions and stabilities of C/Fe co-precipitates and may directly affect the Fe and C cycles in soils.

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Source
http://dx.doi.org/10.1021/acs.est.6b02793DOI Listing

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