Composition of Dissolved Organic Matter in Pore Waters of Anoxic Marine Sediments Analyzed by 1H Nuclear Magnetic Resonance Spectroscopy
Abstract
Marine sediments are globally significant sources of dissolved organic matter (DOM) to the oceans, but the biogeochemical role of pore-water DOM in the benthic and marine carbon cycles remains unclear due to a lack of understanding about the molecular composition of DOM. To help fill this knowledge gap, we used 1H nuclear magnetic resonance (NMR) spectroscopy to examine depth variability in the composition of pore-water DOM in anoxic sediments of Santa Barbara Basin, California Borderland. Proton detected spectra were acquired on whole samples without pre-concentration to avoid preclusion of any DOM components from the analytical window. Broad unresolved resonance (operationally assigned to carboxyl-rich alicyclic molecules, or CRAM) dominated all spectra. Most of the relatively well-resolved peaks (attributed to biomolecules or their derivatives) appeared at chemical shifts similar to those previously reported for marine DOM in the literature, but at different relative intensities. DOM composition changed significantly within the top 50 cm of the sediment column, where the relative intensity of CRAM increased, and the relative intensity of resolved resonances decreased. The composition of CRAM itself also changed throughout the entire length of the 4.5-m profile, as CRAM protons became increasingly aliphatic at the expense of functionalized protons. Given that pore-watermore »
- Authors:
- Publication Date:
- Research Org.:
- Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
- Sponsoring Org.:
- USDOE National Nuclear Security Administration (NNSA)
- OSTI Identifier:
- 1439111
- Alternate Identifier(s):
- OSTI ID: 1518565
- Report Number(s):
- LLNL-JRNL-751233
Journal ID: ISSN 2296-7745; 172
- Grant/Contract Number:
- AC52-07NA27344; OCE-1155562; OCE-1155320; OCE-1155764
- Resource Type:
- Published Article
- Journal Name:
- Frontiers in Marine Science
- Additional Journal Information:
- Journal Name: Frontiers in Marine Science Journal Volume: 5; Journal ID: ISSN 2296-7745
- Publisher:
- Frontiers Media SA
- Country of Publication:
- Switzerland
- Language:
- English
- Subject:
- 59 BASIC BIOLOGICAL SCIENCES; pore water; DOM; carbon; NMR; sediment; anoxic; marine; Santa Barbara Basin
Citation Formats
Fox, Christina A., Abdulla, Hussain A., Burdige, David J., Lewicki, James P., and Komada, Tomoko. Composition of Dissolved Organic Matter in Pore Waters of Anoxic Marine Sediments Analyzed by 1H Nuclear Magnetic Resonance Spectroscopy. Switzerland: N. p., 2018.
Web. https://doi.org/10.3389/fmars.2018.00172.
Fox, Christina A., Abdulla, Hussain A., Burdige, David J., Lewicki, James P., & Komada, Tomoko. Composition of Dissolved Organic Matter in Pore Waters of Anoxic Marine Sediments Analyzed by 1H Nuclear Magnetic Resonance Spectroscopy. Switzerland. https://doi.org/10.3389/fmars.2018.00172
Fox, Christina A., Abdulla, Hussain A., Burdige, David J., Lewicki, James P., and Komada, Tomoko. Fri .
"Composition of Dissolved Organic Matter in Pore Waters of Anoxic Marine Sediments Analyzed by 1H Nuclear Magnetic Resonance Spectroscopy". Switzerland. https://doi.org/10.3389/fmars.2018.00172.
@article{osti_1439111,
title = {Composition of Dissolved Organic Matter in Pore Waters of Anoxic Marine Sediments Analyzed by 1H Nuclear Magnetic Resonance Spectroscopy},
author = {Fox, Christina A. and Abdulla, Hussain A. and Burdige, David J. and Lewicki, James P. and Komada, Tomoko},
abstractNote = {Marine sediments are globally significant sources of dissolved organic matter (DOM) to the oceans, but the biogeochemical role of pore-water DOM in the benthic and marine carbon cycles remains unclear due to a lack of understanding about the molecular composition of DOM. To help fill this knowledge gap, we used 1H nuclear magnetic resonance (NMR) spectroscopy to examine depth variability in the composition of pore-water DOM in anoxic sediments of Santa Barbara Basin, California Borderland. Proton detected spectra were acquired on whole samples without pre-concentration to avoid preclusion of any DOM components from the analytical window. Broad unresolved resonance (operationally assigned to carboxyl-rich alicyclic molecules, or CRAM) dominated all spectra. Most of the relatively well-resolved peaks (attributed to biomolecules or their derivatives) appeared at chemical shifts similar to those previously reported for marine DOM in the literature, but at different relative intensities. DOM composition changed significantly within the top 50 cm of the sediment column, where the relative intensity of CRAM increased, and the relative intensity of resolved resonances decreased. The composition of CRAM itself also changed throughout the entire length of the 4.5-m profile, as CRAM protons became increasingly aliphatic at the expense of functionalized protons. Given that pore-water DOM is generated from sedimentary organic matter that includes pre-aged and degraded material, and that DOM is theoretically subject to microbial reworking in the pore waters for centuries to millennia, these data suggest that marine sediments may be sources of CRAM that are compositionally unique from CRAM generated in the upper ocean.},
doi = {10.3389/fmars.2018.00172},
journal = {Frontiers in Marine Science},
number = ,
volume = 5,
place = {Switzerland},
year = {2018},
month = {5}
}
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https://doi.org/10.3389/fmars.2018.00172
https://doi.org/10.3389/fmars.2018.00172
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Cited by: 5 works
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Figures / Tables:
FIGURE 1: Pore water DOC concentration profile from Santa Barbara Basin sediments showing data from one multicore (0–50 cm; core 43,1) and three gravity cores (>50 cm; G15, BB26, BB35; Burdige et al., 2016; Komada et al., 2016). All of the data shown were obtained by high-temperature combustion (Burdige andmore »
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