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Title: Advanced Molecular Techniques Provide New Rigorous Tools for Characterizing Organic Matter Quality in Complex Systems

Abstract

We report that carbon flux rates are widely understood to be substrate controlled; however, characterizing substrate quality continues to be a challenge. We suggest that, while optical measurements have their place, they are not the only, or the best, tool for characterizing organic matter quality. Nominal oxidation state of the carbon provides a thermodynamically relevant measure, which could be used as a metric of organic matter quality. Lastly, calculating nominal oxidation state of the carbon requires a suite of advanced complementary analysis but is then trivial to calculate from the resulting data sets.

Authors:
ORCiD logo [1]; ORCiD logo [2]
  1. Florida State Univ., Tallahassee, FL (United States)
  2. Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Publication Date:
Research Org.:
Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Biological and Environmental Research (BER)
OSTI Identifier:
1490394
Alternate Identifier(s):
OSTI ID: 1454626
Report Number(s):
PNNL-SA-138120
Journal ID: ISSN 2169-8953
Grant/Contract Number:  
AC05-76RL01830; SC0010580; SC0012088
Resource Type:
Accepted Manuscript
Journal Name:
Journal of Geophysical Research. Biogeosciences
Additional Journal Information:
Journal Volume: 123; Journal Issue: 6; Journal ID: ISSN 2169-8953
Publisher:
American Geophysical Union
Country of Publication:
United States
Language:
English
Subject:
54 ENVIRONMENTAL SCIENCES

Citation Formats

Wilson, Rachel M., and Tfaily, Malak M. Advanced Molecular Techniques Provide New Rigorous Tools for Characterizing Organic Matter Quality in Complex Systems. United States: N. p., 2018. Web. doi:10.1029/2018JG004525.
Wilson, Rachel M., & Tfaily, Malak M. Advanced Molecular Techniques Provide New Rigorous Tools for Characterizing Organic Matter Quality in Complex Systems. United States. doi:10.1029/2018JG004525.
Wilson, Rachel M., and Tfaily, Malak M. Wed . "Advanced Molecular Techniques Provide New Rigorous Tools for Characterizing Organic Matter Quality in Complex Systems". United States. doi:10.1029/2018JG004525. https://www.osti.gov/servlets/purl/1490394.
@article{osti_1490394,
title = {Advanced Molecular Techniques Provide New Rigorous Tools for Characterizing Organic Matter Quality in Complex Systems},
author = {Wilson, Rachel M. and Tfaily, Malak M.},
abstractNote = {We report that carbon flux rates are widely understood to be substrate controlled; however, characterizing substrate quality continues to be a challenge. We suggest that, while optical measurements have their place, they are not the only, or the best, tool for characterizing organic matter quality. Nominal oxidation state of the carbon provides a thermodynamically relevant measure, which could be used as a metric of organic matter quality. Lastly, calculating nominal oxidation state of the carbon requires a suite of advanced complementary analysis but is then trivial to calculate from the resulting data sets.},
doi = {10.1029/2018JG004525},
journal = {Journal of Geophysical Research. Biogeosciences},
number = 6,
volume = 123,
place = {United States},
year = {2018},
month = {5}
}

Journal Article:
Free Publicly Available Full Text
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Cited by: 1 work
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Figures / Tables:

Figure 1 Figure 1: Regressions of average molecular weight (M.W.) based on FTICRMS (left panel) versus the optical proxy spectral slope and double bond equivalences (DBE minus O; right panel) versus the optical proxy SUVA254 for pore water samples collected from a Sphagnum-dominated bog and Carex-dominated fen site in Stordalen mire, Sweden,more » and a Spruce (Picea sp.) bog in Minnesota (USA) by these authors (unpublished data). The FTICRMS-based average molecular weight of the dissolved organic matter was not significantly correlated with the optical proxy for molecular weight: spectral slope (p> 0.05). Double bond equivalences (DBE minus O) were not significantly correlated with the optical proxy for aromaticity (SUVA254). The apparent separation in the Sweden samples along spectral slope corresponds closely with habitat, the Sphagnum-dominated bog has lower spectral slope, while the Carex-dominated fen has higher spectral slope. These two habitats, however, do not differ in average molecular weight ($t$ = 0.095, $p$ > 0.05), suggesting that while optical properties are indicating differences in bulk dissolved organic matter, they may not be fully capturing the desired features. FTICRMS = Fourier transform ion cyclotron resonance mass spectrometry.« less

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    Works referencing / citing this record:

    Examination of molecular space and feasible structures of bioactive components of humic substances by FTICR MS data mining in ChEMBL database
    journal, August 2019

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