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Calcareous organic matter coatings sequester siderophores in alkaline soils

Journal Article · · Science of the Total Environment
 [1];  [2];  [2];  [3];  [2];  [2];  [2];  [2];  [2];  [2];  [2];  [2];  [4]
  1. Pacific Northwest National Lab. (PNNL), Richland, WA (United States). Environmental Molecular Sciences Lab. (EMSL); Oregon State Univ., Corvallis, OR (United States)
  2. Pacific Northwest National Lab. (PNNL), Richland, WA (United States). Environmental Molecular Sciences Lab. (EMSL)
  3. Pacific Northwest National Lab. (PNNL), Richland, WA (United States). Environmental Molecular Sciences Lab. (EMSL); Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
  4. Pacific Northwest National Lab. (PNNL), Richland, WA (United States). Environmental Molecular Sciences Lab. (EMSL); Iowa State Univ., Ames, IA (United States)
Although most studies on organic matter stabilization in soils have focused on adsorption to aluminosilicate and iron oxide minerals due to their strong interactions with organic nucleophiles, stabilization within alkaline soils has been empirically correlated with exchangeable Ca concentrations. Yet the extent of competing processes within natural soil remain unclear. We employed sub-micron scale techniques to investigate the minerology and organic carbon on individual fine particles within an alkaline soil from Eastern Washington. XRD, Mössbauer spectroscopy, TEM-EDX-SAED, and XPS analysis demonstrated a mineral assemblage dominated by quartz, feldspars, iron oxides, and calcite. Although exposed Si, Al, and Fe accounted for ~30% of the surface elemental composition, most of the organic carbon and nitrogen was associated with Ca-rich coatings. Adsorption isotherms of two siderophores with the same soil showed greater adsorption of pyoverdine compared with less polar enterobactin. Using NanoSIMS to map the distribution of isotopically labeled siderophores across the surfaces of fine grains, we observed a preference for binding to surfaces heavily coated with organic matter. We propose a mechanism of adsorption by which organic molecules aggregate within calcareous soils via calcium bridging, favoring the stabilization of larger molecules with a greater number of nucleophilic functional groups.
Research Organization:
Pacific Northwest National Laboratory (PNNL), Richland, WA (United States). Environmental Molecular Sciences Laboratory (EMSL); Sandia National Laboratories (SNL-NM), Albuquerque, NM (United States)
Sponsoring Organization:
USDOE Laboratory Directed Research and Development (LDRD) Program; USDOE National Nuclear Security Administration (NNSA); USDOE Office of Science (SC), Biological and Environmental Research (BER)
Grant/Contract Number:
AC04-94AL85000; AC05-76RL01830
OSTI ID:
1631325
Alternate ID(s):
OSTI ID: 1772024
Report Number(s):
PNNL-SA--147851; SAND--2021-2763J
Journal Information:
Science of the Total Environment, Journal Name: Science of the Total Environment Journal Issue: C Vol. 724; ISSN 0048-9697
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

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