University of Limerick Institutional Repository

Insights into the composition of recalcitrant organic matter from estuarine sediments using NMR spectroscopy

DSpace Repository

Show simple item record Mylotte, Rosaleen Sutrisno, A. Farooq, H. Masoom, H. Soong, Michael H.B. Simpson, A.J. 2017-08-04T11:51:12Z 2016
dc.description peer-reviewed en_US
dc.description The full text of this article will not be available on ULIR until the embargo expires on the 24/05/2018
dc.description.abstract Sediment cores (ca. 6 m) from an estuarine environment gave insights into the composition and preservation of recalcitrant organic carbon (OC) in the environment. The coring locations provided organic matter (OM) of terrestrial origin and of marine origin. Our study specifically focused on the humin (HU), the OM fraction that is most difficult to isolate and to characterize. HU fractions were compared with the total OM recovered after removal of the associated mineral colloids. Solid state and multiphase (nuclear magnetic resonance) NMR experiments were carried out on dried and swollen samples to obtain comparative information about the whole samples and the fractionated samples. The total OM associated with the clay-size fraction provided a standard that allowed differences between the fractions to be observed. The NMR data provided new insights into the molecular structures that become part of the long term C sink in sediments. The recalcitrant OC in the sediments is composed mainly of aliphatic hydrocarbon material that may be protected from, or otherwise unavailable for, degradation. Microbial peptides and carbohydrates were also shown to be important contributors to the C sink and these biomolecules may be from living biomass or preserved necromass. Lignin residues formed only a small part of the OM in the surface sediments but made a greater contribution at depth. Highly ordered components in HU (that resists swelling by dimethylsulfoxide, DMSO) play a major role in C sequestration. en_US
dc.language.iso eng en_US
dc.publisher Elsevier en_US
dc.relation.ispartofseries Organic Geochemistry;98, pp. 155-165
dc.rights This is the author’s version of a work that was accepted for publication in Organic Geochemistry. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Organic Geochemistry, 2016, 98, pp. 155-165, en_US
dc.subject humin en_US
dc.subject comprehensive multiphase NMR en_US
dc.subject solid-state NMR en_US
dc.subject sediment en_US
dc.subject organic matter en_US
dc.title Insights into the composition of recalcitrant organic matter from estuarine sediments using NMR spectroscopy en_US
dc.type info:eu-repo/semantics/article en_US
dc.type.supercollection all_ul_research en_US
dc.type.supercollection ul_published_reviewed en_US
dc.identifier.doi 10.1016/j.orggeochem.2016.05.011 2018-05-24
dc.embargo.terms 2018-05-24 en_US
dc.rights.accessrights info:eu-repo/semantics/embargoedAccess en_US

Files in this item

This item appears in the following Collection(s)

Show simple item record

Search ULIR


My Account