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  • Reactive oxygen species alter chemical composition and adsorptive fractionation of soil-derived organic matter
  • Patel, Kaizad F.; Pacific Northwest National Laboratory
    Tejnecky, Vaclav; Czech University of Life Sciences
    Ohno, Tsutomu; University of Maine
    Bailey, Vanessa L.; Pacific Northwest National Laboratory
    Sleighter, Rachel L.; Old Dominion University
    Hatcher, Patrick G.; Old Dominion University
  • 2020-11-03
  • Patel, K.F., V. Tejnecky, T. Ohno, V.L. Bailey, R.L. Sleighter, and P.G. Hatcher. 2020. Reactive oxygen species alter chemical composition and adsorptive fractionation of soil-derived organic matter ver 2. Environmental Data Initiative. https://doi.org/DOI_PLACE_HOLDER (Accessed 2024-12-29).

  • This is the data archive for the corresponding publication with the same title (doi: 10.1016/j.geoderma.2020.114805). Reactive oxygen species (ROS), formed during redox fluctuations in iron-rich soils, have been known to stimulate lignin degradation, although not much is known about how they alter soil organic matter (SOM) composition and interaction with mineral surfaces. We conducted a laboratory experiment to see how ROS altered SOM composition and adsorptive fractionation onto Fe-mineral surfaces. We reacted water extracts of SOM with ·OH, produced by the Fenton reaction, and then conducted a sorption experiment of the extracts with goethite to analyze the amount and quality of SOM adsorbed. The Fenton reaction preferentially consumed low-O, mostly aromatic molecules, and new high-O molecules were detected post-Fenton, nearly half of which were carbohydrate-like. Although the amount of C adsorbed did not change after oxidation, the post-Fenton adsorbed molecules were more oxidized. Pre-Fenton adsorption was dominated by aromatic molecules (90%), but post-Fenton, the adsorbed molecules were 75% aromatic and 25% carbohydrate-like. We show that the ·OH radical oxidized SOM and shifted patterns of adsorption to a more oxidized pool. Because adsorption to minerals is thought to stabilize SOM, our results suggest that ROS may alter the availability and stabilization patterns of SOM

  • N: 44.87      S: 44.87      E: -68.1      W: -68.1
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  • DOI PLACE HOLDER
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