Composition of Marine Dissolved Organic Matter: First Chemical Formulas as detected by Fouriertransform Mass Spectrometry
Marine dissolved organic matter (DOM) represents an enormous amount of organic carbon comparable to that of atmospheric CO2. A major part of DOM is refractory and resistant to chemical decomposition and despite manifold analytical approaches the bulk of its chemical structure remains completely unkn...
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ftawi:oai:epic.awi.de:10344 2023-09-05T13:23:30+02:00 Composition of Marine Dissolved Organic Matter: First Chemical Formulas as detected by Fouriertransform Mass Spectrometry Koch, Boris Dittmar, T. Engbrodt, R. Graeve, Martin Witt, M. Kattner, Gerhard 2004 https://epic.awi.de/id/eprint/10344/ https://hdl.handle.net/10013/epic.20829 unknown Koch, B. orcid:0000-0002-8453-731X , Dittmar, T. , Engbrodt, R. , Graeve, M. orcid:0000-0002-2294-1915 , Witt, M. and Kattner, G. (2004) Composition of Marine Dissolved Organic Matter: First Chemical Formulas as detected by Fouriertransform Mass Spectrometry , 7th European Workshop on Fouriertransform Mass Spectrometry, 28 Mar.-01 Apr., Konstanz, Germany. . hdl:10013/epic.20829 EPIC37th European Workshop on Fouriertransform Mass Spectrometry, 28 Mar.-01 Apr., Konstanz, Germany. Conference notRev 2004 ftawi 2023-08-22T19:48:38Z Marine dissolved organic matter (DOM) represents an enormous amount of organic carbon comparable to that of atmospheric CO2. A major part of DOM is refractory and resistant to chemical decomposition and despite manifold analytical approaches the bulk of its chemical structure remains completely unknown. This study addressed the question: What are the sources and formation processes of DOM in the ocean? The Southern Ocean is a key area to study DOM of pure marine origin. However a considerable amount of terrestrial DOM is transported by rivers to the oceans. The modification of terrestrial DOM by photo-degradation was examined in a 10-day degradation experiment. Software was developed to process chemical formulas for several thousand mass peaks in the FTMS spectra. On this basis the elemental contribution of dissolved oxygen and hydrogen to DOM was estimated. Selective losses of compounds with high O/C and low H/C ratios indicate loss of aromatic compounds and carboxylic acids during photo-degradation. The chemical formulas varied significantly between marine and terrestrial DOM sources and between marine DOM samples of differing maturity states. Conference Object Southern Ocean Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) Southern Ocean |
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Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) |
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description |
Marine dissolved organic matter (DOM) represents an enormous amount of organic carbon comparable to that of atmospheric CO2. A major part of DOM is refractory and resistant to chemical decomposition and despite manifold analytical approaches the bulk of its chemical structure remains completely unknown. This study addressed the question: What are the sources and formation processes of DOM in the ocean? The Southern Ocean is a key area to study DOM of pure marine origin. However a considerable amount of terrestrial DOM is transported by rivers to the oceans. The modification of terrestrial DOM by photo-degradation was examined in a 10-day degradation experiment. Software was developed to process chemical formulas for several thousand mass peaks in the FTMS spectra. On this basis the elemental contribution of dissolved oxygen and hydrogen to DOM was estimated. Selective losses of compounds with high O/C and low H/C ratios indicate loss of aromatic compounds and carboxylic acids during photo-degradation. The chemical formulas varied significantly between marine and terrestrial DOM sources and between marine DOM samples of differing maturity states. |
format |
Conference Object |
author |
Koch, Boris Dittmar, T. Engbrodt, R. Graeve, Martin Witt, M. Kattner, Gerhard |
spellingShingle |
Koch, Boris Dittmar, T. Engbrodt, R. Graeve, Martin Witt, M. Kattner, Gerhard Composition of Marine Dissolved Organic Matter: First Chemical Formulas as detected by Fouriertransform Mass Spectrometry |
author_facet |
Koch, Boris Dittmar, T. Engbrodt, R. Graeve, Martin Witt, M. Kattner, Gerhard |
author_sort |
Koch, Boris |
title |
Composition of Marine Dissolved Organic Matter: First Chemical Formulas as detected by Fouriertransform Mass Spectrometry |
title_short |
Composition of Marine Dissolved Organic Matter: First Chemical Formulas as detected by Fouriertransform Mass Spectrometry |
title_full |
Composition of Marine Dissolved Organic Matter: First Chemical Formulas as detected by Fouriertransform Mass Spectrometry |
title_fullStr |
Composition of Marine Dissolved Organic Matter: First Chemical Formulas as detected by Fouriertransform Mass Spectrometry |
title_full_unstemmed |
Composition of Marine Dissolved Organic Matter: First Chemical Formulas as detected by Fouriertransform Mass Spectrometry |
title_sort |
composition of marine dissolved organic matter: first chemical formulas as detected by fouriertransform mass spectrometry |
publishDate |
2004 |
url |
https://epic.awi.de/id/eprint/10344/ https://hdl.handle.net/10013/epic.20829 |
geographic |
Southern Ocean |
geographic_facet |
Southern Ocean |
genre |
Southern Ocean |
genre_facet |
Southern Ocean |
op_source |
EPIC37th European Workshop on Fouriertransform Mass Spectrometry, 28 Mar.-01 Apr., Konstanz, Germany. |
op_relation |
Koch, B. orcid:0000-0002-8453-731X , Dittmar, T. , Engbrodt, R. , Graeve, M. orcid:0000-0002-2294-1915 , Witt, M. and Kattner, G. (2004) Composition of Marine Dissolved Organic Matter: First Chemical Formulas as detected by Fouriertransform Mass Spectrometry , 7th European Workshop on Fouriertransform Mass Spectrometry, 28 Mar.-01 Apr., Konstanz, Germany. . hdl:10013/epic.20829 |
_version_ |
1776204088955895808 |