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Title: Developing a Molecular Picture of Soil Organic Matter–Mineral Interactions by Quantifying Organo–Mineral Binding

Abstract

Long residence times of soil organic matter have been attributed to reactive mineral surface sites that sorb organic species and cause inaccessibility due to isolation and chemical stabilization at the organic-mineral interface. Instrumentation for probing this interface is limited. As a result, much of the micron- and molecular-scale knowledge about organic-mineral interactions remains largely qualitative. We report the use of force spectroscopy to directly measure the binding between organic ligands with known chemical functionalities to soil minerals in aqueous environments. By systematically studying the role of organic functional group chemistry with model minerals, we demonstrate that the chemistry of both the organic ligand and mineral contribute to values of binding free energy and that changes in pH and ionic strength produce significant differences in binding energies. These direct measurements of molecular binding provide mechanistic insights into organo-mineral interactions, which could potentially inform land-carbon models that explicitly include mineral-bound C pools.

Authors:
 [1];  [1];  [1];  [1];  [2]
  1. Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
  2. Pacific Northwest National Lab. (PNNL), Richland, WA (United States); Univ. of Washington, Seattle, WA (United States). Dept. of Materials Science and Engineering
Publication Date:
Research Org.:
Pacific Northwest National Laboratory (PNNL), Richland, WA (United States). Environmental Molecular Sciences Laboratory (EMSL)
Sponsoring Org.:
USDOE Office of Science (SC), Biological and Environmental Research (BER)
OSTI Identifier:
1406734
Alternate Identifier(s):
OSTI ID: 1398203
Report Number(s):
PNNL-SA-121086; PNNL-SA-124131
Journal ID: ISSN 2041-1723; 49124
Grant/Contract Number:  
AC05-76RL01830
Resource Type:
Accepted Manuscript
Journal Name:
Nature Communications
Additional Journal Information:
Journal Volume: 8; Journal Issue: 1; Journal ID: ISSN 2041-1723
Publisher:
Nature Publishing Group
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; 58 GEOSCIENCES; Environmental Molecular Sciences Laboratory; soil organic matter; dynamic force microscopy; mineral; interface; Carbon cycle; Geochemistry

Citation Formats

Newcomb, Christina J., Qafoku, Nikolla P., Grate, Jay W., Bailey, Vanessa L., and De Yoreo, James J. Developing a Molecular Picture of Soil Organic Matter–Mineral Interactions by Quantifying Organo–Mineral Binding. United States: N. p., 2017. Web. doi:10.1038/s41467-017-00407-9.
Newcomb, Christina J., Qafoku, Nikolla P., Grate, Jay W., Bailey, Vanessa L., & De Yoreo, James J. Developing a Molecular Picture of Soil Organic Matter–Mineral Interactions by Quantifying Organo–Mineral Binding. United States. https://doi.org/10.1038/s41467-017-00407-9
Newcomb, Christina J., Qafoku, Nikolla P., Grate, Jay W., Bailey, Vanessa L., and De Yoreo, James J. Wed . "Developing a Molecular Picture of Soil Organic Matter–Mineral Interactions by Quantifying Organo–Mineral Binding". United States. https://doi.org/10.1038/s41467-017-00407-9. https://www.osti.gov/servlets/purl/1406734.
@article{osti_1406734,
title = {Developing a Molecular Picture of Soil Organic Matter–Mineral Interactions by Quantifying Organo–Mineral Binding},
author = {Newcomb, Christina J. and Qafoku, Nikolla P. and Grate, Jay W. and Bailey, Vanessa L. and De Yoreo, James J.},
abstractNote = {Long residence times of soil organic matter have been attributed to reactive mineral surface sites that sorb organic species and cause inaccessibility due to isolation and chemical stabilization at the organic-mineral interface. Instrumentation for probing this interface is limited. As a result, much of the micron- and molecular-scale knowledge about organic-mineral interactions remains largely qualitative. We report the use of force spectroscopy to directly measure the binding between organic ligands with known chemical functionalities to soil minerals in aqueous environments. By systematically studying the role of organic functional group chemistry with model minerals, we demonstrate that the chemistry of both the organic ligand and mineral contribute to values of binding free energy and that changes in pH and ionic strength produce significant differences in binding energies. These direct measurements of molecular binding provide mechanistic insights into organo-mineral interactions, which could potentially inform land-carbon models that explicitly include mineral-bound C pools.},
doi = {10.1038/s41467-017-00407-9},
journal = {Nature Communications},
number = 1,
volume = 8,
place = {United States},
year = {Wed Aug 30 00:00:00 EDT 2017},
month = {Wed Aug 30 00:00:00 EDT 2017}
}

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