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Instruments / Technical Area	Publication Details	Published	Actions
I08-Scanning X-ray Microscopy beamline (SXM)	Carboxyl-richness controls organic carbon preservation during coprecipitation with iron (oxyhydr)oxides in the natural environment Lisa Curti , Oliver W. Moore , Peyman Babakhani , Ke-Qing Xiao , Clare Woulds , Andrew W. Bray , Ben J. Fisher , Majid Kazemian , Burkhard Kaulich , Caroline L. Peacock Communications Earth & Environment 2 DOI: 10.1038/s43247-021-00301-9 Diamond Proposal Number(s): [21323, 20839, 23049] Open Access Show Abstract ▼ Abstract: The coprecipitation of organic carbon with iron minerals is important for its preservation in soils and sediments, but the mechanisms for carbon-iron interactions and thus the controls on organic carbon cycling are far from understood. Here we coprecipitate carboxylic acids with iron (oxyhydr)oxide ferrihydrite and use near-edge X-ray absorption fine structure spectroscopy and wet chemical treatments to determine the relationship between sequestration mechanism and organic carbon stability against its release and chemical oxidative remineralisation. We show that organic carbon sequestration, stabilisation and persistence increase with an increasing number of carboxyl functional groups. We suggest that carboxyl-richness provides an important control on organic carbon preservation in the natural environment. Our work offers a mechanistic basis for understanding the stability and persistence of organic carbon in soils and sediments, which might be used to develop an overarching relationship between organic functional group-richness, mineral interactions and organic carbon preservation in the Earth system.	Nov 2021

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I08-Scanning X-ray Microscopy beamline (SXM)

Carboxyl-richness controls organic carbon preservation during coprecipitation with iron (oxyhydr)oxides in the natural environment

Lisa Curti , Oliver W. Moore , Peyman Babakhani , Ke-Qing Xiao , Clare Woulds , Andrew W. Bray , Ben J. Fisher , Majid Kazemian , Burkhard Kaulich , Caroline L. Peacock

Communications Earth & Environment 2

DOI: 10.1038/s43247-021-00301-9

Diamond Proposal Number(s): [21323, 20839, 23049]