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Title: Speciation of Soil Phosphorus Assessed by XANES Spectroscopy at Different Spatial Scales

Journal Article · · Journal of Environmental Quality
 [1];  [2];  [3]
  1. North Carolina State Univ., Raleigh, NC (United States)
  2. Argonne National Lab. (ANL), Argonne, IL (United States)
  3. Brookhaven National Lab. (BNL), Upton, NY (United States)
+ Show Author Affiliations

Precise management of soil phosphorus (P) to meet competing demands of agriculture and environmental protection can benefit from more comprehensive characterization of P speciation in soils. Our objectives were to provide spatial context for spectroscopic analyses of soil P speciation in relation to molecular‐scale species and landscape‐scale management of P, and to compare soil P‐species diversity from spectroscopic measurements at submicron and millimeter scales. The spatial range of ∼26 orders of magnitude between atomic and field scales presents a challenge to upscaling and downscaling information from spectroscopic analyses of soils. Scanning fluorescence X‐ray microscopy images of a 50‐μm × 45‐μm area of an organic soil sample showed heterogeneous distributions of P, Al, and Si. Microscale X‐ray absorption near edge structure (μ‐XANES) spectra collected at the P K‐edge from 12 spots on the soil sample exhibited diverse features that indicated variations in highly localized P speciation. Linear combination fitting analysis of the μ‐XANES spectra included various proportions of three standards that appeared in fits for most spots and five standards that appeared in fits for one spot each. The fit to a bulk‐soil spectrum was dominated by two of the common standards in the μ‐XANES fits, and a fit to the sum of μ‐XANES spectra included four of the standards. These results illustrate a gain in P species sensitivity from spatially resolved XANES analysis. Integrating spectroscopic analyses from multiple scales determines soil P species diversity and will ultimately help connect speciation to the chemical reactivity and mobility of P in soils. Core Ideas Diverse molecular‐scale species of phosphorus occur in a soil. XANES analysis at different scales connects speciation across scales. Microscale XANES spectroscopy analysis improves detection of minor P species. Bulk‐sample XANES spectroscopy analyzes major P species in a representative volume.

Research Organization:
Brookhaven National Laboratory (BNL), Upton, NY (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
SC0012704
OSTI ID:
1434766
Alternate ID(s):
OSTI ID: 1581847
Report Number(s):
BNL-203486-2018-JAAM
Journal Information:
Journal of Environmental Quality, Vol. 46, Issue 6; ISSN 0047-2425
Publisher:
American Society of Agronomy, Crop Science Society of America, and Soil Science Society of AmericaCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 17 works
Citation information provided by
Web of Science

References (23)

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Evidence for Different Reaction Pathways for Liquid and Granular Micronutrients in a Calcareous Soil journal January 2008
Phosphorus Speciation in Manure and Manure-Amended Soils Using XANES Spectroscopy journal October 2005
XANES Determination of Adsorbed Phosphate Distribution between Ferrihydrite and Boehmite in Mixtures journal January 2004
Speciation and Distribution of Phosphorus in a Fertilized Soil journal January 2006
Iron(III) Coordination and Phosphate Sorption in Peat Reacted with Ferric or Ferrous Iron journal January 2012
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journal July 2010
First-principles study of the OH-stretching modes of gibbsite journal January 2006
Competitive Sorption of Arsenate and Phosphate on Different Clay Minerals and Soils journal January 2002
XANES Speciation of Phosphorus in Organically Amended and Fertilized Vertisol and Mollisol journal January 2008
Determination of Mn valence states in mixed-valent manganates by XANES spectroscopy journal May 2012
Speciation of Phosphorus in Phosphorus-Enriched Agricultural Soils Using X-Ray Absorption Near-Edge Structure Spectroscopy and Chemical Fractionation journal January 2003
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