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Composition of dissolved organic matter within a lacustrine environment

McCaul, Margaret and Sutton, David and Simpson, André J. and Spence, Adrian and Mcnally, David J. and Moran, Brian W. and Goel, Alok and O'Connor, Brendan and Hart, Kris M. and Kelleher, Brian (2011) Composition of dissolved organic matter within a lacustrine environment. Environmental Chemistry, 8 (2). pp. 146-154. ISSN 1448-2517

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Abstract

Freshwater dissolved organic matter (DOM) is a complex mixture of chemical components that are central to many environmental processes, including carbon and nitrogen cycling. However, questions remain as to its chemical characteristics, sources and transformation mechanisms. Here, we employ 1- and 2-D nuclear magnetic resonance (NMR) spectroscopy to investigate the structural components of lacustrine DOM from Ireland, and how it varies within a lake system, as well as to assess potential sources. Major components found, such as carboxyl-rich alicyclic molecules (CRAM) are consistent with those recently identified in marine and freshwater DOM. Lignin-type markers and protein/peptides were identified and vary spatially. Phenylalanine was detected in lake areas influenced by agriculture, whereas it is not detectable where zebra mussels are prominent. The presence of peptidoglycan, lipoproteins, large polymeric carbo- hydrates and proteinaceous material supports the substantial contribution of material derived from microorganisms. Evidence is provided that peptidoglycan and silicate species may in part originate from soil microbes.

Item Type:Article (Published)
Refereed:Yes
Uncontrolled Keywords:Dissolved organic matter; NMR; lake; variability
Subjects:Physical Sciences > Analytical chemistry
Biological Sciences > Biotechnology
Biological Sciences > Biochemistry
Physical Sciences > Environmental chemistry
DCU Faculties and Centres:DCU Faculties and Schools > Faculty of Science and Health > School of Biotechnology
Research Initiatives and Centres > Irish Separation Science Cluster (ISSC)
Publisher:CSIRO Publishing
Official URL:http://dx.doi.org/10.1071/EN10109
Copyright Information:© 2011 CSIRO
Use License:This item is licensed under a Creative Commons Attribution-NonCommercial-Share Alike 3.0 License. View License
Funders:Science Foundation Ireland
ID Code:17799
Deposited On:28 Feb 2013 11:59 by Brendan O'Connor. Last Modified 17 Jul 2017 11:41

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