Journal
ENVIRONMENTAL SCIENCE & TECHNOLOGY
Volume 49, Issue 16, Pages 9733-9741Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.est.5b01877
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Funding
- USDA-NIFA-AFRI [2013-67019-21368]
- Maine Agricultural and Forest Experiment Station [ME0-H-1-00472-11]
- Office Of The Director
- Office of Integrative Activities [1355457] Funding Source: National Science Foundation
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The adsorption of dissolved organic matter (DOM) to metal (oxy)hydroxide mineral surfaces is a critical step for C sequestration in soils. Although equilibrium studies have described some of the factors controlling this process, the molecular-scale description of the adsorption process has been more limited. Chemical force spectroscopy revealed differing adhesion strengths of DOM extracted from three soils and a reference peat soil material to an iron (oxy)hydroxide mineral surface. The DOM was characterized using ultrahighresolution negative ion mode electrospray ionization Fourier Transform ion cyclotron resonance mass spectrometry. The results indicate that carboxyl-rich aromatic and N-containing aliphatic molecules of DOM are correlated with high adhesion forces. Increasing molecular mass was shown to decrease the adhesion force between the mineral surface and the DOM. Kendrick mass defect analysis suggests that mechanisms involving two carboxyl groups result in the most stable bond to the mineral surface. We conceptualize these results using a layer-by-layer onion model of organic matter stabilization on soil mineral surfaces.
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