Molecular formulae of marine and terrigenous dissolved organic matter detected by Electrospray Ionisation Fourier Transform Ion Cyclotron Resonance Mass Spectrometry
The chemical structure of refractory marine dissolved organic matter (DOM) is still largely unknown. Electrospray Ionisation Fourier Transform Ion Cyclotron Resonance Mass Spectrometry (ESI FT-ICR-MS) resolved the complex mixtures of DOM and provided valuable information on elemental compositions on...
Published in: | Geochimica et Cosmochimica Acta |
---|---|
Main Authors: | , , , , |
Format: | Article in Journal/Newspaper |
Language: | unknown |
Published: |
2005
|
Subjects: | |
Online Access: | https://epic.awi.de/id/eprint/10749/ https://doi.org/10.1016/j.gca.2005.02.027 https://hdl.handle.net/10013/epic.21218 |
id |
ftawi:oai:epic.awi.de:10749 |
---|---|
record_format |
openpolar |
spelling |
ftawi:oai:epic.awi.de:10749 2023-09-05T13:15:12+02:00 Molecular formulae of marine and terrigenous dissolved organic matter detected by Electrospray Ionisation Fourier Transform Ion Cyclotron Resonance Mass Spectrometry Koch, Boris Witt, M. Engbrodt, R. Dittmar, T. Kattner, Gerhard 2005 https://epic.awi.de/id/eprint/10749/ https://doi.org/10.1016/j.gca.2005.02.027 https://hdl.handle.net/10013/epic.21218 unknown Koch, B. orcid:0000-0002-8453-731X , Witt, M. , Engbrodt, R. , Dittmar, T. and Kattner, G. (2005) Molecular formulae of marine and terrigenous dissolved organic matter detected by Electrospray Ionisation Fourier Transform Ion Cyclotron Resonance Mass Spectrometry , Geochimica et cosmochimica acta, 69 (13), pp. 3299-3308 . doi:10.1016/j.gca.2005.02.027 <https://doi.org/10.1016/j.gca.2005.02.027> , hdl:10013/epic.21218 EPIC3Geochimica et cosmochimica acta, 69(13), pp. 3299-3308, ISSN: 0016-7037 Article isiRev 2005 ftawi https://doi.org/10.1016/j.gca.2005.02.027 2023-08-22T19:48:54Z The chemical structure of refractory marine dissolved organic matter (DOM) is still largely unknown. Electrospray Ionisation Fourier Transform Ion Cyclotron Resonance Mass Spectrometry (ESI FT-ICR-MS) resolved the complex mixtures of DOM and provided valuable information on elemental compositions on a molecular scale. We characterised and compared DOM from two sharply contrasting aquatic environments, algal-derived DOM from the Weddell Sea (Antarctica) and terrigenous DOM from seawater of a tropical mangrove area in northern Brazil. Several thousand molecular formulas in the mass range of 300-600 Da were identified and reproduced in element ratio plots. On the basis of molecular elemental composition and double bond equivalents (DBE) we calculated an average composition for marine DOM. O/C ratios in the marine samples were lower (0.36 ± 0.01) than in the mangrove porewater sample (0.42). A small proportion of chemical formulas with higher molecular mass in the marine samples were characterised by very low O/C and H/C ratios probably reflecting amphiphilic properties. The average number of unsaturations in the marine samples was surprisingly high (DBE = 9.9; mangrove porewater: DBE = 9.4) most likely due to a significant contribution of carbonyl carbon. Apart from higher DBE in the deep-water samples there was no significant difference between surface and deep-water in the Weddell Sea. Although there were some molecules with unique marine elemental composition, there was a conspicuous degree of similarity between the terrigenous and algal-derived endmembers. Approximately one third of the molecular formulas were present in all marine as well as in the mangrove samples. We infer that the most different forms of microbial degradation in the biosphere ultimately lead to similar structural features that are intrinsically refractory, independent of the ultimate source of organic matter and the environmental conditions where degradation took place. Article in Journal/Newspaper Antarc* Antarctica Weddell Sea Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) Weddell Weddell Sea Geochimica et Cosmochimica Acta 69 13 3299 3308 |
institution |
Open Polar |
collection |
Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) |
op_collection_id |
ftawi |
language |
unknown |
description |
The chemical structure of refractory marine dissolved organic matter (DOM) is still largely unknown. Electrospray Ionisation Fourier Transform Ion Cyclotron Resonance Mass Spectrometry (ESI FT-ICR-MS) resolved the complex mixtures of DOM and provided valuable information on elemental compositions on a molecular scale. We characterised and compared DOM from two sharply contrasting aquatic environments, algal-derived DOM from the Weddell Sea (Antarctica) and terrigenous DOM from seawater of a tropical mangrove area in northern Brazil. Several thousand molecular formulas in the mass range of 300-600 Da were identified and reproduced in element ratio plots. On the basis of molecular elemental composition and double bond equivalents (DBE) we calculated an average composition for marine DOM. O/C ratios in the marine samples were lower (0.36 ± 0.01) than in the mangrove porewater sample (0.42). A small proportion of chemical formulas with higher molecular mass in the marine samples were characterised by very low O/C and H/C ratios probably reflecting amphiphilic properties. The average number of unsaturations in the marine samples was surprisingly high (DBE = 9.9; mangrove porewater: DBE = 9.4) most likely due to a significant contribution of carbonyl carbon. Apart from higher DBE in the deep-water samples there was no significant difference between surface and deep-water in the Weddell Sea. Although there were some molecules with unique marine elemental composition, there was a conspicuous degree of similarity between the terrigenous and algal-derived endmembers. Approximately one third of the molecular formulas were present in all marine as well as in the mangrove samples. We infer that the most different forms of microbial degradation in the biosphere ultimately lead to similar structural features that are intrinsically refractory, independent of the ultimate source of organic matter and the environmental conditions where degradation took place. |
format |
Article in Journal/Newspaper |
author |
Koch, Boris Witt, M. Engbrodt, R. Dittmar, T. Kattner, Gerhard |
spellingShingle |
Koch, Boris Witt, M. Engbrodt, R. Dittmar, T. Kattner, Gerhard Molecular formulae of marine and terrigenous dissolved organic matter detected by Electrospray Ionisation Fourier Transform Ion Cyclotron Resonance Mass Spectrometry |
author_facet |
Koch, Boris Witt, M. Engbrodt, R. Dittmar, T. Kattner, Gerhard |
author_sort |
Koch, Boris |
title |
Molecular formulae of marine and terrigenous dissolved organic matter detected by Electrospray Ionisation Fourier Transform Ion Cyclotron Resonance Mass Spectrometry |
title_short |
Molecular formulae of marine and terrigenous dissolved organic matter detected by Electrospray Ionisation Fourier Transform Ion Cyclotron Resonance Mass Spectrometry |
title_full |
Molecular formulae of marine and terrigenous dissolved organic matter detected by Electrospray Ionisation Fourier Transform Ion Cyclotron Resonance Mass Spectrometry |
title_fullStr |
Molecular formulae of marine and terrigenous dissolved organic matter detected by Electrospray Ionisation Fourier Transform Ion Cyclotron Resonance Mass Spectrometry |
title_full_unstemmed |
Molecular formulae of marine and terrigenous dissolved organic matter detected by Electrospray Ionisation Fourier Transform Ion Cyclotron Resonance Mass Spectrometry |
title_sort |
molecular formulae of marine and terrigenous dissolved organic matter detected by electrospray ionisation fourier transform ion cyclotron resonance mass spectrometry |
publishDate |
2005 |
url |
https://epic.awi.de/id/eprint/10749/ https://doi.org/10.1016/j.gca.2005.02.027 https://hdl.handle.net/10013/epic.21218 |
geographic |
Weddell Weddell Sea |
geographic_facet |
Weddell Weddell Sea |
genre |
Antarc* Antarctica Weddell Sea |
genre_facet |
Antarc* Antarctica Weddell Sea |
op_source |
EPIC3Geochimica et cosmochimica acta, 69(13), pp. 3299-3308, ISSN: 0016-7037 |
op_relation |
Koch, B. orcid:0000-0002-8453-731X , Witt, M. , Engbrodt, R. , Dittmar, T. and Kattner, G. (2005) Molecular formulae of marine and terrigenous dissolved organic matter detected by Electrospray Ionisation Fourier Transform Ion Cyclotron Resonance Mass Spectrometry , Geochimica et cosmochimica acta, 69 (13), pp. 3299-3308 . doi:10.1016/j.gca.2005.02.027 <https://doi.org/10.1016/j.gca.2005.02.027> , hdl:10013/epic.21218 |
op_doi |
https://doi.org/10.1016/j.gca.2005.02.027 |
container_title |
Geochimica et Cosmochimica Acta |
container_volume |
69 |
container_issue |
13 |
container_start_page |
3299 |
op_container_end_page |
3308 |
_version_ |
1776197022855987200 |