Publication Details |
| Category | Text Publication |
| Reference Category | Journals |
| DOI | 10.1021/acs.est.5c01998 |
Licence  |
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| Title (Primary) | Functional group distribution shapes chemical properties of degraded terrestrial and marine dissolved organic matter |
| Author | Rodrigues Matos, R.; Craig, A.; Koch, B.; Hawkes, J.; Moodie, L.; Ivanova, A.; Gleixner, G.; Guth, P.; Knorr, K.-H.; Tebben, J.; Reemtsma, T.; Zherebker, A.; Lechtenfeld, O.
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| Source Titel | Environmental Science & Technology |
| Year | 2025 |
| Department | EAC |
| Volume | 59 |
| Issue | 49 |
| Page From | 26539 |
| Page To | 26549 |
| Language | englisch |
| Topic | T9 Healthy Planet |
| Data and Software links | https://doi.org/10.48758/ufz.16221 |
| Supplements | Supplement 1 |
| Keywords | degradation markers; dissolved organic matter (DOM); acidity-based fractionation; sequential solid-phase extraction (SSPE); liquid chromatography fourier transform ion cyclotron resonance mass spectrometry (LC-FT-ICR MS); proton nuclear magnetic resonance spectroscopy (1H-NMR); molecular tagging; deuteromethylation; functional groups |
| UFZ wide themes | ProVIS; |
| Abstract | Dissolved organic matter (DOM) plays a crucial role in global carbon cycling, yet its molecular complexity and the factors governing its turnover and degradation in different ecosystems are poorly understood. Here, we provide an experimental assessment of structural diversity in terrestrial and marine DOM, using a multimethod approach. Terrestrial peat pore water (PPW) exhibited a similar number of COOH-groups, two times more noncarboxylic oxygen atoms (non-COOH–O, up to n = 20) as compared to surface seawater (SSW; up to n = 10), and significantly higher isomeric dispersity indices (2.5–3.0 vs 1.3–1.5), highlighting its greater structural complexity and isomeric diversity. At the level of individual molecular formulas of the widely used DOM degradation index (IDEG), we found that POSIDEG molecular formulas representing fresh DOM (i.e., they were positively correlated with radiocarbon content) share similar structural characteristics in both environments (e.g., low number of carboxyl-groups). In contrast, NEGIDEG markers for degraded DOM (i.e., negatively correlated with radiocarbon content) displayed a higher number of carboxyl-groups in the least acidic fraction for PPW but in the most acidic fraction for SSW. Our results indicate ecosystem-specific degradation pathways emphasizing how global carbon cycling is influenced by the molecular structure of DOM. |
| Persistent UFZ Identifier | https://www.ufz.de/index.php?en=20939&ufzPublicationIdentifier=31618 |
| Rodrigues Matos, R., Craig, A., Koch, B., Hawkes, J., Moodie, L., Ivanova, A., Gleixner, G., Guth, P., Knorr, K.-H., Tebben, J., Reemtsma, T., Zherebker, A., Lechtenfeld, O. (2025): Functional group distribution shapes chemical properties of degraded terrestrial and marine dissolved organic matter Environ. Sci. Technol. 59 (49), 26539 - 26549 10.1021/acs.est.5c01998 |
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