Dissolved organic matter in soil: Interactions with mineral surfaces
Dissolved organic matter (DOM) is ubiquitous in terrestrial and aquatic ecosystems where it serves several important functions. It plays a central role in the landscape carbon balance, connects the terrestrial and aquatic environments, and acts as a vector for both nutrients and contaminants. DOM is made of molecularly dispersed compounds and suspended objects with a size below 0.2 micrometer. The interaction between DOM and minerals leads to the formation of DOM-mineral colloids. Recently, these colloidal associations have been proposed to stabilize organic matter against microbial decomposition. Yet, very little is known about the colloidal properties of the DOM-mineral associations. The aim of this proposal is to investigate DOM-mineral interactions by adding known amounts of goethite (FeOOH) or hematite (Fe2O3) to DOM and observe their effect on DOM aggregation and adsorption. We will explore contrast variation to highlight the scattering from DOM and mineral individually. The results will allow us to characterize DOM and its interactions with relevant mineral particles.
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ANDERSSON Erika; GENTILE Luigi; MATSARSKAIA Olga; MEKLESH Viktoriia; OLSSON Ulf; PERSSON Per; SCHWEINS Ralf and TUNLID Anders. (2020). Dissolved organic matter in soil: Interactions with mineral surfaces. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.9-12-597
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