Berggren, Martin

del Giorgio, Paul A.

Dittmar, Thorsten

Lapierre, Jean-François

Stubbins, Aron

English

Lund University Publications

LUND UNIVERSITYPO Box 117221 00 Lund+46 46-222 00 00What’s in an EEM? : Molecular signatures associated with dissolved organicfluorophoresStubbins, Aron; del Giorgio, Paul A.; Berggren, Martin; Lapierre, Jean-François; Dittmar,Thorsten2013Link to publicationCitation for published version (APA):Stubbins, A., del Giorgio, P. A., Berggren, M., Lapierre, J-F., & Dittmar, T. (2013). What’s in an EEM? :Molecular signatures associated with dissolved organic fluorophores. Abstract from ASLO 2013 AquaticSciences Meeting : Learning for the Future, 2013, New Orleans, Louisiana, United States.Total number of authors:5General rightsUnless other specific re-use rights are stated the following general rights apply:Copyright and moral rights for the publications made accessible in the public portal are retained by the authorsand/or other copyright owners and it is a condition of accessing publications that users recognise and abide by thelegal requirements associated with these rights. • Users may download and print one copy of any publication from the public portal for the purpose of private studyor research. • You may not further distribute the material or use it for any profit-making activity or commercial gain • You may freely distribute the URL identifying the publication in the public portalRead more about Creative commons licenses: https://creativecommons.org/licenses/Take down policyIf you believe that this document breaches copyright please contact us providing details, and we will removeaccess to the work immediately and investigate your claim.Stubbins A (oral), PA del Giorgio, M Berggren, JF Lapierre and T Dittmar. 2013. What’s in an EEM? : Molecular signatures associated with dissolved organic fluorophores. ASLO 2013 Aquatic Sciences Meeting: Learning for the Future, presented on February 19, 2013, in New Orleans, Louisiana, USA  ABSTRACT Excitation emission matrix fluorescence spectra are now widely used to provide a rapid, inexpensive assessment of dissolved organic matter quality. Yet little is known about the molecules that track these fluorophores in the environment. Here we present patterns of correlations between fluorescent components and the thousands of dissolved organic molecular formulas resolved by Fourier transform ion cyclotron mass spectrometry from a suite of boreal river samples. The mass spectral peaks correlating with specific fluorophores have distinct, organized elemental stoichiometries. For instance, the group or cohort of molecular peaks correlating with protein-like fluorophores was enriched in nitrogen, whereas the cohort correlating with humic-like fluorescence was overwhelmingly comprised of CHO-only molecules. Not all mass spectral peaks correlating with a fluorophore were fluorescent, i.e. not all were aromatic, indicating that EEM peaks also track molecules beyond the fluorescent DOM pool. Therefore the correlations between mass spectral and fluorescent peaks are presumably driven by similarities in the sources and sinks of the molecular peaks that track a specific fluorophore in the environment. 

What’s in an EEM? : Molecular signatures associated with dissolved organic fluorophores

https://lup.lub.lu.se/search/files/6252986/4580323.pdf

What’s in an EEM? : Molecular signatures associated with dissolved organic fluorophores

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