Isotopic constraints on the sources and associations of organic compounds in marine sediments
Submitted in partial fulfillment of the requirements for the degree of Doctor of Philosophy at the Massachusetts Institute of Technology and the Woods Hole Oceanographic Institution February 2006 To provide a new perspective on the fate of both natural organic matter and hydrophobic organic contamin...
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Massachusetts Institute of Technology and Woods Hole Oceanographic Institution
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ftwhoas:oai:darchive.mblwhoilibrary.org:1912/1512 2023-05-15T17:09:42+02:00 Isotopic constraints on the sources and associations of organic compounds in marine sediments White, Helen K. Guaymas Basin Peru Margin Benguela Upwelling Santa Monica Basin New England Margin Washington Margin Eel River Margin Pettaquamscutt River Penobscot Bay Lowes Cove Blakely Harbor West Falmouth, MA Mackenzie Shelf Ross Sea 2006-02 3628654 bytes application/pdf https://hdl.handle.net/1912/1512 en_US eng Massachusetts Institute of Technology and Woods Hole Oceanographic Institution WHOI Theses https://hdl.handle.net/1912/1512 doi:10.1575/1912/1512 doi:10.1575/1912/1512 Marine sediments Carbon compounds Thesis 2006 ftwhoas https://doi.org/10.1575/1912/1512 2022-05-28T22:57:15Z Submitted in partial fulfillment of the requirements for the degree of Doctor of Philosophy at the Massachusetts Institute of Technology and the Woods Hole Oceanographic Institution February 2006 To provide a new perspective on the fate of both natural organic matter and hydrophobic organic contaminants (HOCs) in marine sediments, we have investigated the relationship between radiocarbon (14C) age and the different modes of association in aquatic sediments and soils. Radiocarbon is a sensitive tracer of OM provenance, with variations in its natural abundance reflecting the age and origin of material. The main objective has been to determine the significance of these associations, and to assess how they affect the transport, bioavailability, preservation and residence times of organic compounds in the environment. Our results indicate that the majority of HOCs that persist in marine sediments are solvent-extractable and incorporation into insoluble sediment residues is not quantitatively significant. For pristine sediments, systematic variations in 14C content are observed between different chemically defined sedimentary organic fractions. These variations are dependent on organic matter inputs and/or the affects of diagenesis. Our observations also provide evidence for the protection of labile marine carbon by chemical binding. Finally, the persistence of n-alkanes from biogenic sources compared to those derived from petroleum indicates that protective matrix association can play a crucial role in determining the long-term fate of a compound. Overall, it is clear that both natural organic compounds and HOCs can undergo very different fates depending on their mode of introduction to, and physical disposition in environmental matrices. Funding for this research was provided by the National Science Foundation, CHE-0089172 to T.I. Eglinton and C.M. Reddy, and OCE-82567700 to T.I. Eglinton. I received support from a Charles Davis Hollister Fellowship from Woods Hole Oceanographic Institution. Thesis Mackenzie Shelf Ross Sea Woods Hole Scientific Community: WHOAS (Woods Hole Open Access Server) Ross Sea Woods Hole, MA |
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Woods Hole Scientific Community: WHOAS (Woods Hole Open Access Server) |
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ftwhoas |
language |
English |
topic |
Marine sediments Carbon compounds |
spellingShingle |
Marine sediments Carbon compounds White, Helen K. Isotopic constraints on the sources and associations of organic compounds in marine sediments |
topic_facet |
Marine sediments Carbon compounds |
description |
Submitted in partial fulfillment of the requirements for the degree of Doctor of Philosophy at the Massachusetts Institute of Technology and the Woods Hole Oceanographic Institution February 2006 To provide a new perspective on the fate of both natural organic matter and hydrophobic organic contaminants (HOCs) in marine sediments, we have investigated the relationship between radiocarbon (14C) age and the different modes of association in aquatic sediments and soils. Radiocarbon is a sensitive tracer of OM provenance, with variations in its natural abundance reflecting the age and origin of material. The main objective has been to determine the significance of these associations, and to assess how they affect the transport, bioavailability, preservation and residence times of organic compounds in the environment. Our results indicate that the majority of HOCs that persist in marine sediments are solvent-extractable and incorporation into insoluble sediment residues is not quantitatively significant. For pristine sediments, systematic variations in 14C content are observed between different chemically defined sedimentary organic fractions. These variations are dependent on organic matter inputs and/or the affects of diagenesis. Our observations also provide evidence for the protection of labile marine carbon by chemical binding. Finally, the persistence of n-alkanes from biogenic sources compared to those derived from petroleum indicates that protective matrix association can play a crucial role in determining the long-term fate of a compound. Overall, it is clear that both natural organic compounds and HOCs can undergo very different fates depending on their mode of introduction to, and physical disposition in environmental matrices. Funding for this research was provided by the National Science Foundation, CHE-0089172 to T.I. Eglinton and C.M. Reddy, and OCE-82567700 to T.I. Eglinton. I received support from a Charles Davis Hollister Fellowship from Woods Hole Oceanographic Institution. |
format |
Thesis |
author |
White, Helen K. |
author_facet |
White, Helen K. |
author_sort |
White, Helen K. |
title |
Isotopic constraints on the sources and associations of organic compounds in marine sediments |
title_short |
Isotopic constraints on the sources and associations of organic compounds in marine sediments |
title_full |
Isotopic constraints on the sources and associations of organic compounds in marine sediments |
title_fullStr |
Isotopic constraints on the sources and associations of organic compounds in marine sediments |
title_full_unstemmed |
Isotopic constraints on the sources and associations of organic compounds in marine sediments |
title_sort |
isotopic constraints on the sources and associations of organic compounds in marine sediments |
publisher |
Massachusetts Institute of Technology and Woods Hole Oceanographic Institution |
publishDate |
2006 |
url |
https://hdl.handle.net/1912/1512 |
op_coverage |
Guaymas Basin Peru Margin Benguela Upwelling Santa Monica Basin New England Margin Washington Margin Eel River Margin Pettaquamscutt River Penobscot Bay Lowes Cove Blakely Harbor West Falmouth, MA Mackenzie Shelf Ross Sea |
geographic |
Ross Sea |
geographic_facet |
Ross Sea |
genre |
Mackenzie Shelf Ross Sea |
genre_facet |
Mackenzie Shelf Ross Sea |
op_source |
doi:10.1575/1912/1512 |
op_relation |
WHOI Theses https://hdl.handle.net/1912/1512 doi:10.1575/1912/1512 |
op_doi |
https://doi.org/10.1575/1912/1512 |
op_publisher_place |
Woods Hole, MA |
_version_ |
1766065850523058176 |