As an essential plant nutrient, phosphorus (P) is often applied to agricultural fields in the form of animal manure or fertilizer. Excess P can become detrimental to aquatic ecosystems by causing eutrophication. Extensive research about general P pools in soils using sequential extractions, such as the Hedley extraction, has been done over the years. The Hedley extraction is a critical method used world-wide, therefore understanding the P speciation removed with each extraction is crucial. However, sequential extractions cannot directly identify the individual solid phase P species within the general P pools and how they may vary. This is information necessary to determine P bioavailability and environmental susceptibility. By utilizing multi-modal micro X-ray fluorescence (µ-XRF) mapping to determine P elemental collocation with Al, S, Fe, Ca, and Mn followed by micro X-ray absorption near edge structure (µ-XANES) spectroscopy of P hotspots in this research, we will present a direct speciation of the P pools in sequential extraction residues from each step of the Hedley method. The spectroscopic data will be compared to wet chemical data to identify what locally causes the differences in bulk solubility of P species.

Speciation of legacy P in soils using multi-modal μ-XRF mapping and μ-XANES

Macromolecular Chemistry: The Second Century

[Author Benefits](https://scimeetings.acs.org/?utm_source=pubs_content_marketing&utm_medium=website&utm_campaign=0320_MCF_NPI_Launch_Spring_Homepage&ref=pubs_content_marketing)

[How to use SciMeetings](https://storage.googleapis.com/dl.morressier.com/acs/SciMeetings-ACSSpring2020-HowToGuide_M3020-Final.pdf)

[Frequently Asked Questions](https://storage.googleapis.com/dl.morressier.com/acs/SciMtng_ACSNMSp2020_FAQ_M3120_Final.pdf)

ACS Spring 2020 National Meeting & Expo

The official archive and repository for all ACS Meetings & Expositions abstracts and select posters or presentations.