Spatial Associations and Chemical Composition of Organic Carbon Sequestered in Fe, Ca, and Organic Carbon Ternary Systems

Environmental Science & Technology
Tyler D SowersDonald L Sparks

Abstract

Organo-mineral associations of organic carbon (OC) with iron (Fe) oxides play a major role in environmental OC sequestration, a process crucial to mitigating climate change. Calcium has been found to have high coassociation with OC in soils containing high Fe content, increase OC sorption extent to poorly crystalline Fe oxides, and has long been suspected to form bridging complexes with Fe and OC. Due to the growing realization that Ca may be an important component of C cycling, we launched a scanning transmission X-ray microscopy (STXM) investigation, paired with near-edge X-ray absorption fine structure (NEXAFS) spectroscopy, in order to spatially resolve Fe, Ca, and OC relationships and probe the effect of Ca on sorbed OC speciation. We performed STXM-NEXAFS analysis on 2-line ferrihydrite reacted with leaf litter-extractable dissolved OC and citric acid in the absence and presence of Ca. Organic carbon was found to highly associate with Ca ( R2 = 0.91). Carboxylic acid moieties were dominantly sequestered; however, Ca facilitated the additional sequestration of aromatic and phenolic moieties. Also, C NEXAFS revealed polyvalent metal ion complexation. Our results provide evidence for the presence of Fe-Ca-OC ternary complexa...Continue Reading

References

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May 20, 2014·Environmental Science & Technology·Chunmei ChenDonald L Sparks
Oct 29, 2014·Environmental Science & Technology·Chunmei ChenDonald L Sparks
Feb 6, 2018·Geochemical Transactions·Tyler D SowersDonald L Sparks

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Citations

Mar 11, 2020·Journal of Agricultural and Food Chemistry·Minori UchimiyaToshihiro Yoshihara
Dec 12, 2018·Environmental Science & Technology·Elizabeth K CowardDonald L Sparks
Feb 6, 2020·Environmental Science & Technology·Tyler D SowersDonald L Sparks
Jan 2, 2022·The Science of the Total Environment·Panfeng ZhuBrigitte Helmreich

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